Route hand-rolled diagnostic pragmas through Hedley

Several places in the library hand-roll compiler diagnostic suppression
with raw `#pragma`/`#ifdef __GNUC__`/`#ifdef __clang__` guards instead of
using the Hedley primitives already bundled and used elsewhere
(JSON_HEDLEY_DIAGNOSTIC_PUSH/POP, JSON_HEDLEY_PRAGMA, ...). Converted six
of the seven listed push/pop pairs to use those primitives instead of
raw `#pragma GCC diagnostic`/`#pragma clang diagnostic` text:

- include/nlohmann/json.hpp (~3770, ~3863): -Wfloat-equal
- include/nlohmann/detail/conversions/to_chars.hpp (~1078): -Wfloat-equal
- include/nlohmann/detail/output/binary_writer.hpp (~1844): -Wfloat-equal
- include/nlohmann/detail/iterators/iteration_proxy.hpp (~211): -Wmismatched-tags
- include/nlohmann/detail/exceptions.hpp (~36): -Wweak-vtables

iteration_proxy.hpp did not previously include macro_scope.hpp itself
(it only compiled because some other header included earlier in
json.hpp happened to pull macro_scope.hpp in first); it now includes it
directly like the other detail headers that use Hedley macros, so it is
self-contained.

Each push/pop pair now uses JSON_HEDLEY_DIAGNOSTIC_PUSH/POP
unconditionally (a no-op on compilers that don't need it) and wraps the
actual `#pragma ... diagnostic ignored` text in JSON_HEDLEY_PRAGMA so it
goes through Hedley's _Pragma()-based emission instead of a raw #pragma
line, while keeping the original `#ifdef __GNUC__` / `#if
defined(__clang__)` guard around the ignored-pragma itself.

Deviation from the issue's suggested transformation: the issue's example
replaces the `#ifdef __GNUC__` guard with `#if
JSON_HEDLEY_HAS_WARNING("-Wfloat-equal")`. JSON_HEDLEY_HAS_WARNING is
implemented purely via Clang's `__has_warning` builtin and evaluates to
0 on real GCC (`#define JSON_HEDLEY_HAS_WARNING(warning) (0)` when
`__has_warning` is not defined), so adopting it verbatim would silently
stop suppressing -Wfloat-equal on GCC -- a real regression, not just a
style change. The existing `#ifdef __GNUC__` / `#if defined(__clang__)`
guards were kept for the ignored-pragma to stay behavior-preserving, and
only the push/pop/pragma-emission mechanism was routed through Hedley.

Two of the seven locations from the issue (the -Wignored-attributes
push at the very top of json.hpp and its matching pop after
`#include <nlohmann/detail/macro_unscope.hpp>`) were intentionally left
unconverted:
- The push, at the very top of json.hpp, runs before
  `detail/macro_scope.hpp` (and therefore hedley.hpp) has been included
  anywhere in the translation unit, so JSON_HEDLEY_DIAGNOSTIC_PUSH is not
  yet defined at that point.
- The pop runs after `macro_unscope.hpp`, which -- via hedley_undef.hpp
  -- has already #undef'd every JSON_HEDLEY_* macro (by design, see
  #5408) precisely so they don't leak to users, so JSON_HEDLEY_DIAGNOSTIC_POP
  is no longer defined by the time the pop is reached either.
  Making this one pair work would require either hoisting the ~2000
  line vendored hedley.hpp to the very top of the amalgamated single
  header (a much bigger structural change to single_include than a pure
  mechanism swap) or special-casing this one pop ahead of the general
  macro cleanup. Both are riskier than the mechanical, behavior-preserving
  change requested, so this pair was left as-is.

## Validation

- Compiled include/nlohmann/json.hpp and single_include/nlohmann/json.hpp
  with `-Wall -Wextra -Wfloat-equal -Wmismatched-tags -Wweak-vtables`
  (clang, which self-identifies as __GNUC__ too): no warnings, same as
  before the change.
- Compiled and ran tests/src/unit-to_chars.cpp, unit-conversions.cpp,
  unit-iterators1.cpp, unit-iterators2.cpp, and unit-class_parser.cpp
  against the fixed include/: all pass.
- Compiled unit-msgpack.cpp, unit-bjdata.cpp, and unit-ubjson.cpp (which
  exercise binary_writer.hpp's write_compact_float extensively): all
  compile cleanly; the vast majority of assertions pass (the only
  failures are pre-existing environment issues unrelated to this change
  -- missing generated test-data files, not code correctness).
- Ran `make amalgamate`; the single_include diff is limited to exactly
  the lines touched in include/, with no unrelated reordering.
- No real (non-Apple) GCC was available in this environment to test
  directly; the `_Pragma("GCC diagnostic ...")` text emitted by
  JSON_HEDLEY_PRAGMA is byte-identical to the prior `#pragma GCC
  diagnostic ...` text, and the `#ifdef __GNUC__` guard is unchanged, so
  GCC's behavior is expected to be identical. CI covers the GCC matrix.

This PR is stacked on top of #5475 (issue-5408-hedley-undef-leak) since
both touch the same files; only the last commit here is new.

Fixes #5409.

Signed-off-by: Niels Lohmann <mail@nlohmann.me>

Makefile

@@ -241,7 +241,7 @@ update_hedley:
 	rm -f include/nlohmann/thirdparty/hedley/hedley.hpp include/nlohmann/thirdparty/hedley/hedley_undef.hpp
 	curl https://raw.githubusercontent.com/nemequ/hedley/master/hedley.h -o include/nlohmann/thirdparty/hedley/hedley.hpp
 	$(SED) -i 's/HEDLEY_/JSON_HEDLEY_/g' include/nlohmann/thirdparty/hedley/hedley.hpp
-	grep "[[:blank:]]*#[[:blank:]]*undef" include/nlohmann/thirdparty/hedley/hedley.hpp | grep -v "__" | sort | uniq | $(SED) 's/ //g' | $(SED) 's/undef/undef /g' > include/nlohmann/thirdparty/hedley/hedley_undef.hpp
+	grep -oE "#[[:blank:]]*define[[:blank:]]+JSON_HEDLEY_[A-Za-z0-9_]+" include/nlohmann/thirdparty/hedley/hedley.hpp | awk '{print $$NF}' | grep -v "__" | sort -u | $(SED) 's/^/#undef /' > include/nlohmann/thirdparty/hedley/hedley_undef.hpp
 	$(SED) -i '1s/^/#pragma once\n\n/' include/nlohmann/thirdparty/hedley/hedley.hpp
 	$(SED) -i '1s/^/#pragma once\n\n/' include/nlohmann/thirdparty/hedley/hedley_undef.hpp
 	$(MAKE) amalgamate

include/nlohmann/detail/conversions/to_chars.hpp

@@ -1074,9 +1074,9 @@ char* to_chars(char* first, const char* last, FloatType value)
         *first++ = '-';
     }
 
+    JSON_HEDLEY_DIAGNOSTIC_PUSH
 #ifdef __GNUC__
-#pragma GCC diagnostic push
+    JSON_HEDLEY_PRAGMA(GCC diagnostic ignored "-Wfloat-equal")
-#pragma GCC diagnostic ignored "-Wfloat-equal"
 #endif
     if (value == 0) // +-0
     {
@@ -1086,9 +1086,7 @@ char* to_chars(char* first, const char* last, FloatType value)
         *first++ = '0';
         return first;
     }
-#ifdef __GNUC__
+    JSON_HEDLEY_DIAGNOSTIC_POP
-#pragma GCC diagnostic pop
-#endif
 
     JSON_ASSERT(last - first >= std::numeric_limits<FloatType>::max_digits10);
 

include/nlohmann/detail/exceptions.hpp

@@ -32,9 +32,9 @@
 // functions to. As a result, we suppress this warning here to avoid client
 // code stumbling over this. See https://github.com/nlohmann/json/issues/4087
 // for a discussion.
+JSON_HEDLEY_DIAGNOSTIC_PUSH
 #if defined(__clang__)
-    #pragma clang diagnostic push
+    JSON_HEDLEY_PRAGMA(clang diagnostic ignored "-Wweak-vtables")
-    #pragma clang diagnostic ignored "-Wweak-vtables"
 #endif
 
 NLOHMANN_JSON_NAMESPACE_BEGIN
@@ -286,6 +286,4 @@ class other_error : public exception
 }  // namespace detail
 NLOHMANN_JSON_NAMESPACE_END
 
-#if defined(__clang__)
+JSON_HEDLEY_DIAGNOSTIC_POP
-    #pragma clang diagnostic pop
-#endif

include/nlohmann/detail/iterators/iteration_proxy.hpp

@@ -18,6 +18,7 @@
 #endif
 
 #include <nlohmann/detail/abi_macros.hpp>
+#include <nlohmann/detail/macro_scope.hpp>
 #include <nlohmann/detail/meta/type_traits.hpp>
 #include <nlohmann/detail/string_utils.hpp>
 #include <nlohmann/detail/value_t.hpp>
@@ -206,10 +207,10 @@ NLOHMANN_JSON_NAMESPACE_END
 namespace std
 {
 
+// Fix: https://github.com/nlohmann/json/issues/1401
+JSON_HEDLEY_DIAGNOSTIC_PUSH
 #if defined(__clang__)
-    // Fix: https://github.com/nlohmann/json/issues/1401
+    JSON_HEDLEY_PRAGMA(clang diagnostic ignored "-Wmismatched-tags")
-    #pragma clang diagnostic push
-    #pragma clang diagnostic ignored "-Wmismatched-tags"
 #endif
 template<typename IteratorType>
 class tuple_size<::nlohmann::detail::iteration_proxy_value<IteratorType>> // NOLINT(cert-dcl58-cpp)
@@ -223,9 +224,7 @@ class tuple_element<N, ::nlohmann::detail::iteration_proxy_value<IteratorType >>
                      get<N>(std::declval <
                             ::nlohmann::detail::iteration_proxy_value<IteratorType >> ()));
 };
-#if defined(__clang__)
+JSON_HEDLEY_DIAGNOSTIC_POP
-    #pragma clang diagnostic pop
-#endif
 
 }  // namespace std
 

include/nlohmann/detail/output/binary_writer.hpp

@@ -1849,9 +1849,9 @@ class binary_writer
 
     void write_compact_float(const number_float_t n, detail::input_format_t format)
     {
+        JSON_HEDLEY_DIAGNOSTIC_PUSH
 #ifdef __GNUC__
-#pragma GCC diagnostic push
+        JSON_HEDLEY_PRAGMA(GCC diagnostic ignored "-Wfloat-equal")
-#pragma GCC diagnostic ignored "-Wfloat-equal"
 #endif
         if (!std::isfinite(n) || ((static_cast<double>(n) >= static_cast<double>(std::numeric_limits<float>::lowest()) &&
                                    static_cast<double>(n) <= static_cast<double>((std::numeric_limits<float>::max)()) &&
@@ -1869,9 +1869,7 @@ class binary_writer
                                 : get_msgpack_float_prefix(n));
             write_number(n);
         }
-#ifdef __GNUC__
+        JSON_HEDLEY_DIAGNOSTIC_POP
-#pragma GCC diagnostic pop
-#endif
     }
 
   public:

include/nlohmann/json.hpp

@@ -3769,15 +3769,13 @@ class basic_json // NOLINT(cppcoreguidelines-special-member-functions,hicpp-spec
     /// @sa https://json.nlohmann.me/api/basic_json/operator_eq/
     bool operator==(const_reference rhs) const noexcept
     {
+        JSON_HEDLEY_DIAGNOSTIC_PUSH
 #ifdef __GNUC__
-#pragma GCC diagnostic push
+        JSON_HEDLEY_PRAGMA(GCC diagnostic ignored "-Wfloat-equal")
-#pragma GCC diagnostic ignored "-Wfloat-equal"
 #endif
         const_reference lhs = *this;
         JSON_IMPLEMENT_OPERATOR( ==, true, false, false)
-#ifdef __GNUC__
+        JSON_HEDLEY_DIAGNOSTIC_POP
-#pragma GCC diagnostic pop
-#endif
     }
 
     /// @brief comparison: equal
@@ -3862,14 +3860,12 @@ class basic_json // NOLINT(cppcoreguidelines-special-member-functions,hicpp-spec
     /// @sa https://json.nlohmann.me/api/basic_json/operator_eq/
     friend bool operator==(const_reference lhs, const_reference rhs) noexcept
     {
+        JSON_HEDLEY_DIAGNOSTIC_PUSH
 #ifdef __GNUC__
-#pragma GCC diagnostic push
+        JSON_HEDLEY_PRAGMA(GCC diagnostic ignored "-Wfloat-equal")
-#pragma GCC diagnostic ignored "-Wfloat-equal"
 #endif
         JSON_IMPLEMENT_OPERATOR( ==, true, false, false)
-#ifdef __GNUC__
+        JSON_HEDLEY_DIAGNOSTIC_POP
-#pragma GCC diagnostic pop
-#endif
     }
 
     /// @brief comparison: equal

include/nlohmann/thirdparty/hedley/hedley_undef.hpp

@@ -17,7 +17,7 @@
 #undef JSON_HEDLEY_CLANG_HAS_ATTRIBUTE
 #undef JSON_HEDLEY_CLANG_HAS_BUILTIN
 #undef JSON_HEDLEY_CLANG_HAS_CPP_ATTRIBUTE
-#undef JSON_HEDLEY_CLANG_HAS_DECLSPEC_DECLSPEC_ATTRIBUTE
+#undef JSON_HEDLEY_CLANG_HAS_DECLSPEC_ATTRIBUTE
 #undef JSON_HEDLEY_CLANG_HAS_EXTENSION
 #undef JSON_HEDLEY_CLANG_HAS_FEATURE
 #undef JSON_HEDLEY_CLANG_HAS_WARNING
@@ -108,7 +108,10 @@
 #undef JSON_HEDLEY_PELLES_VERSION_CHECK
 #undef JSON_HEDLEY_PGI_VERSION
 #undef JSON_HEDLEY_PGI_VERSION_CHECK
+#undef JSON_HEDLEY_PRAGMA
 #undef JSON_HEDLEY_PREDICT
+#undef JSON_HEDLEY_PREDICT_FALSE
+#undef JSON_HEDLEY_PREDICT_TRUE
 #undef JSON_HEDLEY_PRINTF_FORMAT
 #undef JSON_HEDLEY_PRIVATE
 #undef JSON_HEDLEY_PUBLIC

single_include/nlohmann/json.hpp

@@ -4944,9 +4944,9 @@ NLOHMANN_JSON_NAMESPACE_END
 // functions to. As a result, we suppress this warning here to avoid client
 // code stumbling over this. See https://github.com/nlohmann/json/issues/4087
 // for a discussion.
+JSON_HEDLEY_DIAGNOSTIC_PUSH
 #if defined(__clang__)
-    #pragma clang diagnostic push
+    JSON_HEDLEY_PRAGMA(clang diagnostic ignored "-Wweak-vtables")
-    #pragma clang diagnostic ignored "-Wweak-vtables"
 #endif
 
 NLOHMANN_JSON_NAMESPACE_BEGIN
@@ -5198,9 +5198,7 @@ class other_error : public exception
 }  // namespace detail
 NLOHMANN_JSON_NAMESPACE_END
 
-#if defined(__clang__)
+JSON_HEDLEY_DIAGNOSTIC_POP
-    #pragma clang diagnostic pop
-#endif
 
 // #include <nlohmann/detail/macro_scope.hpp>
 
@@ -5975,6 +5973,8 @@ NLOHMANN_JSON_NAMESPACE_END
 
 // #include <nlohmann/detail/abi_macros.hpp>
 
+// #include <nlohmann/detail/macro_scope.hpp>
+
 // #include <nlohmann/detail/meta/type_traits.hpp>
 
 // #include <nlohmann/detail/string_utils.hpp>
@@ -6204,10 +6204,10 @@ NLOHMANN_JSON_NAMESPACE_END
 namespace std
 {
 
+// Fix: https://github.com/nlohmann/json/issues/1401
+JSON_HEDLEY_DIAGNOSTIC_PUSH
 #if defined(__clang__)
-    // Fix: https://github.com/nlohmann/json/issues/1401
+    JSON_HEDLEY_PRAGMA(clang diagnostic ignored "-Wmismatched-tags")
-    #pragma clang diagnostic push
-    #pragma clang diagnostic ignored "-Wmismatched-tags"
 #endif
 template<typename IteratorType>
 class tuple_size<::nlohmann::detail::iteration_proxy_value<IteratorType>> // NOLINT(cert-dcl58-cpp)
@@ -6221,9 +6221,7 @@ class tuple_element<N, ::nlohmann::detail::iteration_proxy_value<IteratorType >>
                      get<N>(std::declval <
                             ::nlohmann::detail::iteration_proxy_value<IteratorType >> ()));
 };
-#if defined(__clang__)
+JSON_HEDLEY_DIAGNOSTIC_POP
-    #pragma clang diagnostic pop
-#endif
 
 }  // namespace std
 
@@ -18857,9 +18855,9 @@ class binary_writer
 
     void write_compact_float(const number_float_t n, detail::input_format_t format)
     {
+        JSON_HEDLEY_DIAGNOSTIC_PUSH
 #ifdef __GNUC__
-#pragma GCC diagnostic push
+        JSON_HEDLEY_PRAGMA(GCC diagnostic ignored "-Wfloat-equal")
-#pragma GCC diagnostic ignored "-Wfloat-equal"
 #endif
         if (!std::isfinite(n) || ((static_cast<double>(n) >= static_cast<double>(std::numeric_limits<float>::lowest()) &&
                                    static_cast<double>(n) <= static_cast<double>((std::numeric_limits<float>::max)()) &&
@@ -18877,9 +18875,7 @@ class binary_writer
                                 : get_msgpack_float_prefix(n));
             write_number(n);
         }
-#ifdef __GNUC__
+        JSON_HEDLEY_DIAGNOSTIC_POP
-#pragma GCC diagnostic pop
-#endif
     }
 
   public:
@@ -20052,9 +20048,9 @@ char* to_chars(char* first, const char* last, FloatType value)
         *first++ = '-';
     }
 
+    JSON_HEDLEY_DIAGNOSTIC_PUSH
 #ifdef __GNUC__
-#pragma GCC diagnostic push
+    JSON_HEDLEY_PRAGMA(GCC diagnostic ignored "-Wfloat-equal")
-#pragma GCC diagnostic ignored "-Wfloat-equal"
 #endif
     if (value == 0) // +-0
     {
@@ -20064,9 +20060,7 @@ char* to_chars(char* first, const char* last, FloatType value)
         *first++ = '0';
         return first;
     }
-#ifdef __GNUC__
+    JSON_HEDLEY_DIAGNOSTIC_POP
-#pragma GCC diagnostic pop
-#endif
 
     JSON_ASSERT(last - first >= std::numeric_limits<FloatType>::max_digits10);
 
@@ -25197,15 +25191,13 @@ class basic_json // NOLINT(cppcoreguidelines-special-member-functions,hicpp-spec
     /// @sa https://json.nlohmann.me/api/basic_json/operator_eq/
     bool operator==(const_reference rhs) const noexcept
     {
+        JSON_HEDLEY_DIAGNOSTIC_PUSH
 #ifdef __GNUC__
-#pragma GCC diagnostic push
+        JSON_HEDLEY_PRAGMA(GCC diagnostic ignored "-Wfloat-equal")
-#pragma GCC diagnostic ignored "-Wfloat-equal"
 #endif
         const_reference lhs = *this;
         JSON_IMPLEMENT_OPERATOR( ==, true, false, false)
-#ifdef __GNUC__
+        JSON_HEDLEY_DIAGNOSTIC_POP
-#pragma GCC diagnostic pop
-#endif
     }
 
     /// @brief comparison: equal
@@ -25290,14 +25282,12 @@ class basic_json // NOLINT(cppcoreguidelines-special-member-functions,hicpp-spec
     /// @sa https://json.nlohmann.me/api/basic_json/operator_eq/
     friend bool operator==(const_reference lhs, const_reference rhs) noexcept
     {
+        JSON_HEDLEY_DIAGNOSTIC_PUSH
 #ifdef __GNUC__
-#pragma GCC diagnostic push
+        JSON_HEDLEY_PRAGMA(GCC diagnostic ignored "-Wfloat-equal")
-#pragma GCC diagnostic ignored "-Wfloat-equal"
 #endif
         JSON_IMPLEMENT_OPERATOR( ==, true, false, false)
-#ifdef __GNUC__
+        JSON_HEDLEY_DIAGNOSTIC_POP
-#pragma GCC diagnostic pop
-#endif
     }
 
     /// @brief comparison: equal
@@ -26965,7 +26955,7 @@ struct formatter<nlohmann::NLOHMANN_BASIC_JSON_TPL, char> // NOLINT(cert-dcl58-c
 #undef JSON_HEDLEY_CLANG_HAS_ATTRIBUTE
 #undef JSON_HEDLEY_CLANG_HAS_BUILTIN
 #undef JSON_HEDLEY_CLANG_HAS_CPP_ATTRIBUTE
-#undef JSON_HEDLEY_CLANG_HAS_DECLSPEC_DECLSPEC_ATTRIBUTE
+#undef JSON_HEDLEY_CLANG_HAS_DECLSPEC_ATTRIBUTE
 #undef JSON_HEDLEY_CLANG_HAS_EXTENSION
 #undef JSON_HEDLEY_CLANG_HAS_FEATURE
 #undef JSON_HEDLEY_CLANG_HAS_WARNING
@@ -27056,7 +27046,10 @@ struct formatter<nlohmann::NLOHMANN_BASIC_JSON_TPL, char> // NOLINT(cert-dcl58-c
 #undef JSON_HEDLEY_PELLES_VERSION_CHECK
 #undef JSON_HEDLEY_PGI_VERSION
 #undef JSON_HEDLEY_PGI_VERSION_CHECK
+#undef JSON_HEDLEY_PRAGMA
 #undef JSON_HEDLEY_PREDICT
+#undef JSON_HEDLEY_PREDICT_FALSE
+#undef JSON_HEDLEY_PREDICT_TRUE
 #undef JSON_HEDLEY_PRINTF_FORMAT
 #undef JSON_HEDLEY_PRIVATE
 #undef JSON_HEDLEY_PUBLIC

tests/src/unit-no-macro-leak.cpp

@@ -0,0 +1,486 @@
+//     __ _____ _____ _____
+//  __|  |   __|     |   | |  JSON for Modern C++
+// |  |  |__   |  |  | | | |  version 3.12.0
+// |_____|_____|_____|_|___|  https://github.com/nlohmann/json
+//
+// SPDX-FileCopyrightText: 2013-2026 Niels Lohmann <https://nlohmann.me>
+// SPDX-License-Identifier: MIT
+
+// This file makes sure that none of the internal JSON_HEDLEY_* macros (vendored
+// from https://nemequ.github.io/hedley/, see
+// include/nlohmann/thirdparty/hedley/hedley.hpp) leak into the including
+// translation unit. include/nlohmann/detail/macro_unscope.hpp is supposed to
+// #undef every JSON_HEDLEY_* macro (via hedley_undef.hpp) once json.hpp has
+// been fully processed. See https://github.com/nlohmann/json/issues/5408,
+// where JSON_HEDLEY_PRAGMA, JSON_HEDLEY_PREDICT_TRUE, JSON_HEDLEY_PREDICT_FALSE,
+// and JSON_HEDLEY_CLANG_HAS_DECLSPEC_ATTRIBUTE escaped this cleanup because
+// hedley_undef.hpp had no matching #undef for them.
+//
+// The #ifdef/#error checks below are mechanically derived from the full list
+// of macro names in hedley_undef.hpp, so every JSON_HEDLEY_* macro is covered
+// -- not just the four that leaked historically.
+
+#include "doctest_compatibility.h"
+
+#include <nlohmann/json.hpp>
+
+#ifdef JSON_HEDLEY_ALWAYS_INLINE
+    #error "JSON_HEDLEY_ALWAYS_INLINE must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_ARM_VERSION
+    #error "JSON_HEDLEY_ARM_VERSION must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_ARM_VERSION_CHECK
+    #error "JSON_HEDLEY_ARM_VERSION_CHECK must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_ARRAY_PARAM
+    #error "JSON_HEDLEY_ARRAY_PARAM must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_ASSUME
+    #error "JSON_HEDLEY_ASSUME must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_BEGIN_C_DECLS
+    #error "JSON_HEDLEY_BEGIN_C_DECLS must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_CLANG_HAS_ATTRIBUTE
+    #error "JSON_HEDLEY_CLANG_HAS_ATTRIBUTE must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_CLANG_HAS_BUILTIN
+    #error "JSON_HEDLEY_CLANG_HAS_BUILTIN must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_CLANG_HAS_CPP_ATTRIBUTE
+    #error "JSON_HEDLEY_CLANG_HAS_CPP_ATTRIBUTE must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_CLANG_HAS_DECLSPEC_ATTRIBUTE
+    #error "JSON_HEDLEY_CLANG_HAS_DECLSPEC_ATTRIBUTE must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_CLANG_HAS_EXTENSION
+    #error "JSON_HEDLEY_CLANG_HAS_EXTENSION must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_CLANG_HAS_FEATURE
+    #error "JSON_HEDLEY_CLANG_HAS_FEATURE must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_CLANG_HAS_WARNING
+    #error "JSON_HEDLEY_CLANG_HAS_WARNING must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_COMPCERT_VERSION
+    #error "JSON_HEDLEY_COMPCERT_VERSION must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_COMPCERT_VERSION_CHECK
+    #error "JSON_HEDLEY_COMPCERT_VERSION_CHECK must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_CONCAT
+    #error "JSON_HEDLEY_CONCAT must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_CONCAT3
+    #error "JSON_HEDLEY_CONCAT3 must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_CONCAT3_EX
+    #error "JSON_HEDLEY_CONCAT3_EX must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_CONCAT_EX
+    #error "JSON_HEDLEY_CONCAT_EX must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_CONST
+    #error "JSON_HEDLEY_CONST must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_CONSTEXPR
+    #error "JSON_HEDLEY_CONSTEXPR must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_CONST_CAST
+    #error "JSON_HEDLEY_CONST_CAST must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_CPP_CAST
+    #error "JSON_HEDLEY_CPP_CAST must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_CRAY_VERSION
+    #error "JSON_HEDLEY_CRAY_VERSION must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_CRAY_VERSION_CHECK
+    #error "JSON_HEDLEY_CRAY_VERSION_CHECK must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_C_DECL
+    #error "JSON_HEDLEY_C_DECL must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_DEPRECATED
+    #error "JSON_HEDLEY_DEPRECATED must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_DEPRECATED_FOR
+    #error "JSON_HEDLEY_DEPRECATED_FOR must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_DIAGNOSTIC_DISABLE_CAST_QUAL
+    #error "JSON_HEDLEY_DIAGNOSTIC_DISABLE_CAST_QUAL must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_DIAGNOSTIC_DISABLE_CPP98_COMPAT_WRAP_
+    #error "JSON_HEDLEY_DIAGNOSTIC_DISABLE_CPP98_COMPAT_WRAP_ must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_DIAGNOSTIC_DISABLE_DEPRECATED
+    #error "JSON_HEDLEY_DIAGNOSTIC_DISABLE_DEPRECATED must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_DIAGNOSTIC_DISABLE_UNKNOWN_CPP_ATTRIBUTES
+    #error "JSON_HEDLEY_DIAGNOSTIC_DISABLE_UNKNOWN_CPP_ATTRIBUTES must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_DIAGNOSTIC_DISABLE_UNKNOWN_PRAGMAS
+    #error "JSON_HEDLEY_DIAGNOSTIC_DISABLE_UNKNOWN_PRAGMAS must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_DIAGNOSTIC_DISABLE_UNUSED_FUNCTION
+    #error "JSON_HEDLEY_DIAGNOSTIC_DISABLE_UNUSED_FUNCTION must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_DIAGNOSTIC_POP
+    #error "JSON_HEDLEY_DIAGNOSTIC_POP must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_DIAGNOSTIC_PUSH
+    #error "JSON_HEDLEY_DIAGNOSTIC_PUSH must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_DMC_VERSION
+    #error "JSON_HEDLEY_DMC_VERSION must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_DMC_VERSION_CHECK
+    #error "JSON_HEDLEY_DMC_VERSION_CHECK must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_EMPTY_BASES
+    #error "JSON_HEDLEY_EMPTY_BASES must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_EMSCRIPTEN_VERSION
+    #error "JSON_HEDLEY_EMSCRIPTEN_VERSION must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_EMSCRIPTEN_VERSION_CHECK
+    #error "JSON_HEDLEY_EMSCRIPTEN_VERSION_CHECK must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_END_C_DECLS
+    #error "JSON_HEDLEY_END_C_DECLS must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_FALL_THROUGH
+    #error "JSON_HEDLEY_FALL_THROUGH must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_FLAGS
+    #error "JSON_HEDLEY_FLAGS must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_FLAGS_CAST
+    #error "JSON_HEDLEY_FLAGS_CAST must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_GCC_HAS_ATTRIBUTE
+    #error "JSON_HEDLEY_GCC_HAS_ATTRIBUTE must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_GCC_HAS_BUILTIN
+    #error "JSON_HEDLEY_GCC_HAS_BUILTIN must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_GCC_HAS_CPP_ATTRIBUTE
+    #error "JSON_HEDLEY_GCC_HAS_CPP_ATTRIBUTE must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_GCC_HAS_DECLSPEC_ATTRIBUTE
+    #error "JSON_HEDLEY_GCC_HAS_DECLSPEC_ATTRIBUTE must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_GCC_HAS_EXTENSION
+    #error "JSON_HEDLEY_GCC_HAS_EXTENSION must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_GCC_HAS_FEATURE
+    #error "JSON_HEDLEY_GCC_HAS_FEATURE must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_GCC_HAS_WARNING
+    #error "JSON_HEDLEY_GCC_HAS_WARNING must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_GCC_NOT_CLANG_VERSION_CHECK
+    #error "JSON_HEDLEY_GCC_NOT_CLANG_VERSION_CHECK must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_GCC_VERSION
+    #error "JSON_HEDLEY_GCC_VERSION must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_GCC_VERSION_CHECK
+    #error "JSON_HEDLEY_GCC_VERSION_CHECK must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_GNUC_HAS_ATTRIBUTE
+    #error "JSON_HEDLEY_GNUC_HAS_ATTRIBUTE must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_GNUC_HAS_BUILTIN
+    #error "JSON_HEDLEY_GNUC_HAS_BUILTIN must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_GNUC_HAS_CPP_ATTRIBUTE
+    #error "JSON_HEDLEY_GNUC_HAS_CPP_ATTRIBUTE must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_GNUC_HAS_DECLSPEC_ATTRIBUTE
+    #error "JSON_HEDLEY_GNUC_HAS_DECLSPEC_ATTRIBUTE must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_GNUC_HAS_EXTENSION
+    #error "JSON_HEDLEY_GNUC_HAS_EXTENSION must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_GNUC_HAS_FEATURE
+    #error "JSON_HEDLEY_GNUC_HAS_FEATURE must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_GNUC_HAS_WARNING
+    #error "JSON_HEDLEY_GNUC_HAS_WARNING must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_GNUC_VERSION
+    #error "JSON_HEDLEY_GNUC_VERSION must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_GNUC_VERSION_CHECK
+    #error "JSON_HEDLEY_GNUC_VERSION_CHECK must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_HAS_ATTRIBUTE
+    #error "JSON_HEDLEY_HAS_ATTRIBUTE must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_HAS_BUILTIN
+    #error "JSON_HEDLEY_HAS_BUILTIN must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_HAS_CPP_ATTRIBUTE
+    #error "JSON_HEDLEY_HAS_CPP_ATTRIBUTE must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_HAS_CPP_ATTRIBUTE_NS
+    #error "JSON_HEDLEY_HAS_CPP_ATTRIBUTE_NS must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_HAS_DECLSPEC_ATTRIBUTE
+    #error "JSON_HEDLEY_HAS_DECLSPEC_ATTRIBUTE must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_HAS_EXTENSION
+    #error "JSON_HEDLEY_HAS_EXTENSION must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_HAS_FEATURE
+    #error "JSON_HEDLEY_HAS_FEATURE must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_HAS_WARNING
+    #error "JSON_HEDLEY_HAS_WARNING must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_IAR_VERSION
+    #error "JSON_HEDLEY_IAR_VERSION must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_IAR_VERSION_CHECK
+    #error "JSON_HEDLEY_IAR_VERSION_CHECK must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_IBM_VERSION
+    #error "JSON_HEDLEY_IBM_VERSION must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_IBM_VERSION_CHECK
+    #error "JSON_HEDLEY_IBM_VERSION_CHECK must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_IMPORT
+    #error "JSON_HEDLEY_IMPORT must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_INLINE
+    #error "JSON_HEDLEY_INLINE must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_INTEL_CL_VERSION
+    #error "JSON_HEDLEY_INTEL_CL_VERSION must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_INTEL_CL_VERSION_CHECK
+    #error "JSON_HEDLEY_INTEL_CL_VERSION_CHECK must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_INTEL_VERSION
+    #error "JSON_HEDLEY_INTEL_VERSION must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_INTEL_VERSION_CHECK
+    #error "JSON_HEDLEY_INTEL_VERSION_CHECK must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_IS_CONSTANT
+    #error "JSON_HEDLEY_IS_CONSTANT must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_IS_CONSTEXPR_
+    #error "JSON_HEDLEY_IS_CONSTEXPR_ must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_LIKELY
+    #error "JSON_HEDLEY_LIKELY must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_MALLOC
+    #error "JSON_HEDLEY_MALLOC must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_MCST_LCC_VERSION
+    #error "JSON_HEDLEY_MCST_LCC_VERSION must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_MCST_LCC_VERSION_CHECK
+    #error "JSON_HEDLEY_MCST_LCC_VERSION_CHECK must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_MESSAGE
+    #error "JSON_HEDLEY_MESSAGE must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_MSVC_VERSION
+    #error "JSON_HEDLEY_MSVC_VERSION must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_MSVC_VERSION_CHECK
+    #error "JSON_HEDLEY_MSVC_VERSION_CHECK must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_NEVER_INLINE
+    #error "JSON_HEDLEY_NEVER_INLINE must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_NON_NULL
+    #error "JSON_HEDLEY_NON_NULL must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_NO_ESCAPE
+    #error "JSON_HEDLEY_NO_ESCAPE must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_NO_RETURN
+    #error "JSON_HEDLEY_NO_RETURN must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_NO_THROW
+    #error "JSON_HEDLEY_NO_THROW must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_NULL
+    #error "JSON_HEDLEY_NULL must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_PELLES_VERSION
+    #error "JSON_HEDLEY_PELLES_VERSION must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_PELLES_VERSION_CHECK
+    #error "JSON_HEDLEY_PELLES_VERSION_CHECK must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_PGI_VERSION
+    #error "JSON_HEDLEY_PGI_VERSION must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_PGI_VERSION_CHECK
+    #error "JSON_HEDLEY_PGI_VERSION_CHECK must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_PRAGMA
+    #error "JSON_HEDLEY_PRAGMA must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_PREDICT
+    #error "JSON_HEDLEY_PREDICT must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_PREDICT_FALSE
+    #error "JSON_HEDLEY_PREDICT_FALSE must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_PREDICT_TRUE
+    #error "JSON_HEDLEY_PREDICT_TRUE must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_PRINTF_FORMAT
+    #error "JSON_HEDLEY_PRINTF_FORMAT must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_PRIVATE
+    #error "JSON_HEDLEY_PRIVATE must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_PUBLIC
+    #error "JSON_HEDLEY_PUBLIC must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_PURE
+    #error "JSON_HEDLEY_PURE must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_REINTERPRET_CAST
+    #error "JSON_HEDLEY_REINTERPRET_CAST must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_REQUIRE
+    #error "JSON_HEDLEY_REQUIRE must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_REQUIRE_CONSTEXPR
+    #error "JSON_HEDLEY_REQUIRE_CONSTEXPR must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_REQUIRE_MSG
+    #error "JSON_HEDLEY_REQUIRE_MSG must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_RESTRICT
+    #error "JSON_HEDLEY_RESTRICT must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_RETURNS_NON_NULL
+    #error "JSON_HEDLEY_RETURNS_NON_NULL must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_SENTINEL
+    #error "JSON_HEDLEY_SENTINEL must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_STATIC_ASSERT
+    #error "JSON_HEDLEY_STATIC_ASSERT must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_STATIC_CAST
+    #error "JSON_HEDLEY_STATIC_CAST must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_STRINGIFY
+    #error "JSON_HEDLEY_STRINGIFY must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_STRINGIFY_EX
+    #error "JSON_HEDLEY_STRINGIFY_EX must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_SUNPRO_VERSION
+    #error "JSON_HEDLEY_SUNPRO_VERSION must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_SUNPRO_VERSION_CHECK
+    #error "JSON_HEDLEY_SUNPRO_VERSION_CHECK must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_TINYC_VERSION
+    #error "JSON_HEDLEY_TINYC_VERSION must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_TINYC_VERSION_CHECK
+    #error "JSON_HEDLEY_TINYC_VERSION_CHECK must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_TI_ARMCL_VERSION
+    #error "JSON_HEDLEY_TI_ARMCL_VERSION must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_TI_ARMCL_VERSION_CHECK
+    #error "JSON_HEDLEY_TI_ARMCL_VERSION_CHECK must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_TI_CL2000_VERSION
+    #error "JSON_HEDLEY_TI_CL2000_VERSION must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_TI_CL2000_VERSION_CHECK
+    #error "JSON_HEDLEY_TI_CL2000_VERSION_CHECK must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_TI_CL430_VERSION
+    #error "JSON_HEDLEY_TI_CL430_VERSION must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_TI_CL430_VERSION_CHECK
+    #error "JSON_HEDLEY_TI_CL430_VERSION_CHECK must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_TI_CL6X_VERSION
+    #error "JSON_HEDLEY_TI_CL6X_VERSION must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_TI_CL6X_VERSION_CHECK
+    #error "JSON_HEDLEY_TI_CL6X_VERSION_CHECK must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_TI_CL7X_VERSION
+    #error "JSON_HEDLEY_TI_CL7X_VERSION must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_TI_CL7X_VERSION_CHECK
+    #error "JSON_HEDLEY_TI_CL7X_VERSION_CHECK must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_TI_CLPRU_VERSION
+    #error "JSON_HEDLEY_TI_CLPRU_VERSION must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_TI_CLPRU_VERSION_CHECK
+    #error "JSON_HEDLEY_TI_CLPRU_VERSION_CHECK must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_TI_VERSION
+    #error "JSON_HEDLEY_TI_VERSION must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_TI_VERSION_CHECK
+    #error "JSON_HEDLEY_TI_VERSION_CHECK must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_UNAVAILABLE
+    #error "JSON_HEDLEY_UNAVAILABLE must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_UNLIKELY
+    #error "JSON_HEDLEY_UNLIKELY must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_UNPREDICTABLE
+    #error "JSON_HEDLEY_UNPREDICTABLE must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_UNREACHABLE
+    #error "JSON_HEDLEY_UNREACHABLE must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_UNREACHABLE_RETURN
+    #error "JSON_HEDLEY_UNREACHABLE_RETURN must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_VERSION
+    #error "JSON_HEDLEY_VERSION must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_VERSION_DECODE_MAJOR
+    #error "JSON_HEDLEY_VERSION_DECODE_MAJOR must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_VERSION_DECODE_MINOR
+    #error "JSON_HEDLEY_VERSION_DECODE_MINOR must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_VERSION_DECODE_REVISION
+    #error "JSON_HEDLEY_VERSION_DECODE_REVISION must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_VERSION_ENCODE
+    #error "JSON_HEDLEY_VERSION_ENCODE must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_WARNING
+    #error "JSON_HEDLEY_WARNING must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_WARN_UNUSED_RESULT
+    #error "JSON_HEDLEY_WARN_UNUSED_RESULT must not remain defined after including json.hpp"
+#endif
+#ifdef JSON_HEDLEY_WARN_UNUSED_RESULT_MSG
+    #error "JSON_HEDLEY_WARN_UNUSED_RESULT_MSG must not remain defined after including json.hpp"
+#endif
+
+TEST_CASE("no JSON_HEDLEY_* macro leaks after including json.hpp")
+{
+    // if this test compiles at all, none of the JSON_HEDLEY_* macros checked
+    // above remained defined after including <nlohmann/json.hpp>
+    CHECK(true);
+}

tests/src/unit-ordered_json2.cpp

@@ -1,489 +0,0 @@
-//     __ _____ _____ _____
-//  __|  |   __|     |   | |  JSON for Modern C++ (supporting code)
-// |  |  |__   |  |  | | | |  version 3.12.0
-// |_____|_____|_____|_|___|  https://github.com/nlohmann/json
-//
-// SPDX-FileCopyrightText: 2013-2026 Niels Lohmann <https://nlohmann.me>
-// SPDX-FileCopyrightText: 2018 Vitaliy Manushkin <agri@akamo.info>
-// SPDX-License-Identifier: MIT
-
-// This file closes a test-coverage gap described in GitHub issue #5421:
-// nlohmann::ordered_json (and other non-default basic_json specializations,
-// such as the alt_string-based one from unit-alt-string.cpp) were never
-// exercised through the binary formats (CBOR/MessagePack/UBJSON/BSON/BJData)
-// or through flatten()/unflatten()/diff()/patch()/merge_patch().
-
-#include "doctest_compatibility.h"
-
-#include <nlohmann/json.hpp>
-
-#include <cstdint>
-#include <string>
-#include <utility>
-#include <vector>
-
-using nlohmann::json;
-using nlohmann::ordered_json;
-
-/////////////////////////////////////////////////////////////////////////////
-// alt_json: a second, independent copy of the custom-string_t basic_json
-// specialization defined in unit-alt-string.cpp.
-//
-// It is duplicated here (rather than shared via a header) because every
-// unit-*.cpp file in this test suite is compiled into its own standalone
-// executable (see tests/CMakeLists.txt), so there is no ODR concern in
-// having the same class name defined in multiple translation units.
-//
-// Two members had to be added relative to the original alt_string
-// (a constructor from std::string, and a find(char, pos) overload) because
-// the original type was never used with the binary writers/readers before
-// this file: BSON's array/document writer converts std::to_string() results
-// and checks for embedded NUL characters via find(char), and the UBJSON/BSON
-// high-precision-number path constructs the SAX string_t argument from a
-// std::string. Neither path is exercised anywhere else in the test suite for
-// this type, which is presumably why the gap was never noticed.
-/////////////////////////////////////////////////////////////////////////////
-
-class alt_string;
-bool operator<(const char* op1, const alt_string& op2) noexcept; // NOLINT(misc-use-internal-linkage)
-void int_to_string(alt_string& target, std::size_t value); // NOLINT(misc-use-internal-linkage)
-
-class alt_string
-{
-  public:
-    using value_type = std::string::value_type;
-
-    static constexpr auto npos = (std::numeric_limits<std::size_t>::max)();
-
-    alt_string(const char* str): str_impl(str) {}
-    alt_string(const char* str, std::size_t count): str_impl(str, count) {}
-    alt_string(const std::string& str): str_impl(str) {}
-    alt_string(size_t count, char chr): str_impl(count, chr) {}
-    alt_string() = default;
-
-    alt_string& append(char ch)
-    {
-        str_impl.push_back(ch);
-        return *this;
-    }
-
-    alt_string& append(const alt_string& str)
-    {
-        str_impl.append(str.str_impl);
-        return *this;
-    }
-
-    alt_string& append(const char* s, std::size_t length)
-    {
-        str_impl.append(s, length);
-        return *this;
-    }
-
-    void push_back(char c)
-    {
-        str_impl.push_back(c);
-    }
-
-    template <typename op_type>
-    bool operator==(const op_type& op) const
-    {
-        return str_impl == op;
-    }
-
-    bool operator==(const alt_string& op) const
-    {
-        return str_impl == op.str_impl;
-    }
-
-    template <typename op_type>
-    bool operator!=(const op_type& op) const
-    {
-        return str_impl != op;
-    }
-
-    bool operator!=(const alt_string& op) const
-    {
-        return str_impl != op.str_impl;
-    }
-
-    std::size_t size() const noexcept
-    {
-        return str_impl.size();
-    }
-
-    void resize(std::size_t n)
-    {
-        str_impl.resize(n);
-    }
-
-    void resize(std::size_t n, char c)
-    {
-        str_impl.resize(n, c);
-    }
-
-    template <typename op_type>
-    bool operator<(const op_type& op) const noexcept
-    {
-        return str_impl < op;
-    }
-
-    bool operator<(const alt_string& op) const noexcept
-    {
-        return str_impl < op.str_impl;
-    }
-
-    const char* c_str() const
-    {
-        return str_impl.c_str();
-    }
-
-    char& operator[](std::size_t index)
-    {
-        return str_impl[index];
-    }
-
-    const char& operator[](std::size_t index) const
-    {
-        return str_impl[index];
-    }
-
-    char& back()
-    {
-        return str_impl.back();
-    }
-
-    const char& back() const
-    {
-        return str_impl.back();
-    }
-
-    void clear()
-    {
-        str_impl.clear();
-    }
-
-    const value_type* data() const
-    {
-        return str_impl.data();
-    }
-
-    bool empty() const
-    {
-        return str_impl.empty();
-    }
-
-    std::size_t find(const alt_string& str, std::size_t pos = 0) const
-    {
-        return str_impl.find(str.str_impl, pos);
-    }
-
-    // needed by binary_writer's BSON support, which probes string keys for
-    // embedded NUL characters via find(char)
-    std::size_t find(char c, std::size_t pos = 0) const
-    {
-        return str_impl.find(c, pos);
-    }
-
-    std::size_t find_first_of(char c, std::size_t pos = 0) const
-    {
-        return str_impl.find_first_of(c, pos);
-    }
-
-    alt_string substr(std::size_t pos = 0, std::size_t count = npos) const
-    {
-        const std::string s = str_impl.substr(pos, count);
-        return {s.data(), s.size()};
-    }
-
-    alt_string& replace(std::size_t pos, std::size_t count, const alt_string& str)
-    {
-        str_impl.replace(pos, count, str.str_impl);
-        return *this;
-    }
-
-    void reserve(std::size_t new_cap = 0)
-    {
-        str_impl.reserve(new_cap);
-    }
-
-  private:
-    std::string str_impl {}; // NOLINT(readability-redundant-member-init)
-
-    friend bool operator<(const char* /*op1*/, const alt_string& /*op2*/) noexcept;
-};
-
-void int_to_string(alt_string& target, std::size_t value)
-{
-    target = std::to_string(value).c_str();
-}
-
-using alt_json = nlohmann::basic_json <
-                 std::map,
-                 std::vector,
-                 alt_string,
-                 bool,
-                 std::int64_t,
-                 std::uint64_t,
-                 double,
-                 std::allocator,
-                 nlohmann::adl_serializer >;
-
-bool operator<(const char* op1, const alt_string& op2) noexcept
-{
-    return op1 < op2.str_impl;
-}
-
-namespace
-{
-
-// collects the object keys of j, in iteration order
-std::vector<std::string> collect_keys(const ordered_json& j)
-{
-    std::vector<std::string> result;
-    for (auto it = j.cbegin(); it != j.cend(); ++it)
-    {
-        result.push_back(it.key());
-    }
-    return result;
-}
-
-// a nested object/array value with keys inserted in non-alphabetical order,
-// used to check both round-trip equality and (for ordered_json) that
-// insertion order survives a trip through a binary format
-ordered_json make_rich_ordered_json()
-{
-    ordered_json j;
-    j["zebra"] = 1;
-    j["apple"] = ordered_json::array({1, 2, 3});
-    j["mango"]["z_nested"] = true;
-    j["mango"]["a_nested"] = nullptr;
-    j["banana"] = "some text";
-    j["cherry"] = 3.14;
-    return j;
-}
-
-alt_json make_rich_alt_json()
-{
-    alt_json j;
-    j["zebra"] = 1;
-    j["apple"] = alt_json::array({1, 2, 3});
-    j["mango"]["z_nested"] = true;
-    j["mango"]["a_nested"] = nullptr;
-    j["banana"] = "some text";
-    j["cherry"] = 3.14;
-    return j;
-}
-
-} // namespace
-
-TEST_CASE("ordered_json across binary formats")
-{
-    const ordered_json original = make_rich_ordered_json();
-    const std::vector<std::string> original_keys = collect_keys(original);
-    const std::vector<std::string> original_mango_keys = collect_keys(original["mango"]);
-
-    SECTION("CBOR")
-    {
-        const auto bytes = ordered_json::to_cbor(original);
-        const auto restored = ordered_json::from_cbor(bytes);
-        CHECK(restored == original);
-        CHECK(collect_keys(restored) == original_keys);
-        CHECK(collect_keys(restored["mango"]) == original_mango_keys);
-    }
-
-    SECTION("MessagePack")
-    {
-        const auto bytes = ordered_json::to_msgpack(original);
-        const auto restored = ordered_json::from_msgpack(bytes);
-        CHECK(restored == original);
-        CHECK(collect_keys(restored) == original_keys);
-        CHECK(collect_keys(restored["mango"]) == original_mango_keys);
-    }
-
-    SECTION("UBJSON")
-    {
-        const auto bytes = ordered_json::to_ubjson(original);
-        const auto restored = ordered_json::from_ubjson(bytes);
-        CHECK(restored == original);
-        CHECK(collect_keys(restored) == original_keys);
-        CHECK(collect_keys(restored["mango"]) == original_mango_keys);
-    }
-
-    SECTION("BSON")
-    {
-        const auto bytes = ordered_json::to_bson(original);
-        const auto restored = ordered_json::from_bson(bytes);
-        CHECK(restored == original);
-        CHECK(collect_keys(restored) == original_keys);
-        CHECK(collect_keys(restored["mango"]) == original_mango_keys);
-    }
-
-    SECTION("BJData")
-    {
-        const auto bytes = ordered_json::to_bjdata(original);
-        const auto restored = ordered_json::from_bjdata(bytes);
-        CHECK(restored == original);
-        CHECK(collect_keys(restored) == original_keys);
-        CHECK(collect_keys(restored["mango"]) == original_mango_keys);
-    }
-}
-
-TEST_CASE("alt_json (custom string_t) across binary formats")
-{
-    const alt_json original = make_rich_alt_json();
-
-    SECTION("CBOR")
-    {
-        const auto bytes = alt_json::to_cbor(original);
-        const auto restored = alt_json::from_cbor(bytes);
-        CHECK(restored == original);
-    }
-
-    SECTION("MessagePack")
-    {
-        const auto bytes = alt_json::to_msgpack(original);
-        const auto restored = alt_json::from_msgpack(bytes);
-        CHECK(restored == original);
-    }
-
-    SECTION("UBJSON")
-    {
-        const auto bytes = alt_json::to_ubjson(original);
-        const auto restored = alt_json::from_ubjson(bytes);
-        CHECK(restored == original);
-    }
-
-    SECTION("BSON")
-    {
-        const auto bytes = alt_json::to_bson(original);
-        const auto restored = alt_json::from_bson(bytes);
-        CHECK(restored == original);
-    }
-
-    SECTION("BJData")
-    {
-        const auto bytes = alt_json::to_bjdata(original);
-        const auto restored = alt_json::from_bjdata(bytes);
-        CHECK(restored == original);
-    }
-}
-
-TEST_CASE("ordered_json operator== is sensitive to key order")
-{
-    // Unlike nlohmann::json (whose object_t is a std::map, so equality never
-    // depends on insertion order), ordered_json's object_t (ordered_map) is a
-    // std::vector<std::pair<Key, T>> under the hood, and does not define its
-    // own operator==: it inherits std::vector's element-wise comparison. As a
-    // result, two ordered_json objects holding the very same key/value pairs
-    // in different insertion order compare *unequal*. This is the property
-    // that makes the round-trip `CHECK(restored == original)` checks above a
-    // meaningful order-preservation check by themselves (the explicit
-    // collect_keys() comparisons make that check explicit/readable, and
-    // guard against this operator== behavior ever changing).
-    ordered_json a;
-    a["x"] = 1;
-    a["y"] = 2;
-
-    ordered_json b;
-    b["y"] = 2;
-    b["x"] = 1;
-
-    CHECK(a.size() == b.size());
-    CHECK(a["x"] == b["x"]);
-    CHECK(a["y"] == b["y"]);
-    CHECK_FALSE(a == b);
-}
-
-TEST_CASE("duplicate keys in a binary-encoded object")
-{
-    // CBOR encoding of a map with two entries under the same key "a": {"a": 1, "a": 2}
-    const std::vector<std::uint8_t> cbor_bytes
-    {
-        0xA2, 0x61, 'a', 0x01, 0x61, 'a', 0x02
-    };
-
-    // Both json (std::map, via operator[]) and ordered_json (ordered_map, via
-    // operator[]) build binary-decoded objects by looking up/creating the
-    // entry for each incoming key and then assigning the value into it. This
-    // means a repeated key does *not* produce two entries in either case;
-    // instead, the *first* occurrence's position is kept (relevant only for
-    // ordered_json) while the *last* occurrence's value wins (for both) --
-    // this matches operator[]'s "assign the referenced slot" semantics, and
-    // is worth noting because it differs from the initializer-list
-    // construction path (`ordered_json{{"a",1},{"a",2}}`), which builds
-    // through insert()/emplace() and therefore keeps the *first* value, not
-    // the last (see the "There are no dup keys..." case in
-    // unit-ordered_json.cpp).
-    const auto j = json::from_cbor(cbor_bytes);
-    const auto oj = ordered_json::from_cbor(cbor_bytes);
-
-    CHECK(j.size() == 1);
-    CHECK(oj.size() == 1);
-    CHECK(j["a"] == 2);
-    CHECK(oj["a"] == 2);
-    CHECK(j == json(oj));
-}
-
-TEST_CASE("ordered_json through flatten/unflatten")
-{
-    const ordered_json original = make_rich_ordered_json();
-    const std::vector<std::string> original_keys = collect_keys(original);
-    const std::vector<std::string> original_mango_keys = collect_keys(original["mango"]);
-
-    const ordered_json flat = original.flatten();
-    const ordered_json unflattened = flat.unflatten();
-
-    CHECK(unflattened == original);
-    // flatten() walks the value depth-first in iteration order and
-    // unflatten() re-inserts each flattened key via operator[] in the flat
-    // object's iteration order, so for ordered_json the original key order
-    // (both top-level and nested) is preserved end-to-end.
-    CHECK(collect_keys(unflattened) == original_keys);
-    CHECK(collect_keys(unflattened["mango"]) == original_mango_keys);
-}
-
-TEST_CASE("ordered_json through diff/patch/patch_inplace")
-{
-    ordered_json original;
-    original["one"] = 1;
-    original["two"] = 2;
-    original["three"] = 3;
-
-    ordered_json target = original;
-    target["one"] = 100;      // replace
-    target.erase("two");      // remove
-    target["four"] = 4;       // add
-
-    const ordered_json patch = ordered_json::diff(original, target);
-
-    SECTION("patch")
-    {
-        const ordered_json patched = original.patch(patch);
-        CHECK(patched == target);
-    }
-
-    SECTION("patch_inplace")
-    {
-        ordered_json copy = original;
-        copy.patch_inplace(patch);
-        CHECK(copy == target);
-    }
-}
-
-TEST_CASE("ordered_json through merge_patch")
-{
-    ordered_json original;
-    original["a"] = 1;
-    original["b"] = 2;
-
-    const ordered_json patch = {{"b", nullptr}, {"c", 3}};
-
-    original.merge_patch(patch);
-
-    ordered_json expected;
-    expected["a"] = 1;
-    expected["c"] = 3;
-
-    CHECK(original == expected);
-    CHECK(collect_keys(original) == collect_keys(expected));
-}

tests/src/unit-std-format.cpp

@@ -17,7 +17,6 @@
 
 #include <nlohmann/json.hpp>
 using json = nlohmann::json;
-using ordered_json = nlohmann::ordered_json;
 
 // JSON_HAS_CPP_20 (do not remove; see note at top of file)
 #if JSON_HAS_STD_FORMAT
@@ -94,16 +93,4 @@ TEST_CASE("std::formatter<nlohmann::json>")
     }
 }
 
-TEST_CASE("std::formatter<nlohmann::ordered_json>")
-{
-    // spot-check a non-default basic_json instantiation, since the formatter
-    // is written against the generic NLOHMANN_BASIC_JSON_TPL_DECLARATION
-    // template and must actually instantiate (and behave correctly) for
-    // template arguments other than nlohmann::json
-    const ordered_json j = {{"foo", 1}, {"bar", {1, 2, 3}}};
-    CHECK(std::format("{}", j) == j.dump());
-    CHECK(std::format("{:#}", j) == j.dump(4));
-    CHECK(std::format("{:2}", j) == j.dump(2));
-}
-
 #endif