Name the expected vector in the unit-iterators1 reverse test for MSVC 2017

MSVC 2017 (/permissive- /std:c++17) rejects the braced std::vector<int>
temporary inside CHECK() in this templated test case (C2440).

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

.github/workflows/windows.yml

@@ -166,19 +166,21 @@ jobs:
       # link, but the binaries clang 11.0.1 and clang 18.1.8 then produce crash
       # before doctest prints its first line - 39 of 102 tests on clang 18.
       # Keep the objects small by splitting the test files instead.
-      # Objects with more than 65535 sections fail to link with "relocation
+      # The tests link with LLD: GNU ld fails on objects with more than 32767
-      # truncated to fit: IMAGE_REL_AMD64_REL32 against `.rdata'": the MinGW
+      # sections with "relocation truncated to fit: IMAGE_REL_AMD64_REL32
-      # linker stores the section an associative COMDAT section belongs to in
+      # against `.rdata'", as it stores the section an associative COMDAT
-      # 16 bits (x_associated in binutils' include/coff/internal.h), so it
+      # section belongs to in 16 bits (x_associated in binutils'
-      # discards the jump tables of inline functions together with the wrong
+      # include/coff/internal.h) and so discards the jump tables of inline
-      # function. Each basic_json specialization a test file instantiates adds
+      # functions together with the wrong function. Each basic_json
-      # many sections, so test a second one in a file of its own.
+      # specialization and input type a test file instantiates adds many
+      # sections, so unit-msgpack.cpp and unit-regression2.cpp kept crossing
+      # that limit as the library grew.
       - name: Run CMake
         run: cmake -S . -B build ^
              -DCMAKE_CXX_COMPILER="C:/Program Files/LLVM/bin/clang++.exe" ^
              -DCMAKE_CXX_FLAGS="--target=x86_64-w64-mingw32 -stdlib=libstdc++ -pthread" ^
              -DCMAKE_CXX_FLAGS_DEBUG="-g0" ^
-             -DCMAKE_EXE_LINKER_FLAGS="-lwinpthread" ^
+             -DCMAKE_EXE_LINKER_FLAGS="-fuse-ld=lld -lwinpthread" ^
              -G"MinGW Makefiles" ^
              -DCMAKE_BUILD_TYPE=Debug ^
              -DJSON_BuildTests=On

include/nlohmann/detail/conversions/to_json.hpp

@@ -13,7 +13,7 @@
     #include <optional> // optional
 #endif
 
-#include <iterator> // begin, end
+#include <iterator> // begin, end, make_move_iterator, move_iterator
 #include <memory> // allocator_traits
 #include <string> //  basic_string, char_traits
 #include <tuple> // tuple, get
@@ -48,6 +48,32 @@ namespace detail
  * leave j with the type of the new value, but the pointer to the destroyed old one.
  */
 
+// a move iterator over the elements of an rvalue container, unless they are
+// const (e.g., std::set): libstdc++ before GCC 5 defines the reference of a
+// std::move_iterator as value_type&&, which cannot bind to a const element
+template<typename Iterator>
+std::move_iterator<Iterator> make_move_iterator_if_mutable_impl(const Iterator& it, std::true_type /*mutable*/)
+{
+    return std::make_move_iterator(it);
+}
+
+template<typename Iterator>
+Iterator make_move_iterator_if_mutable_impl(const Iterator& it, std::false_type /*mutable*/)
+{
+    return it;
+}
+
+template<typename Iterator>
+using is_mutable_iterator = std::integral_constant < bool,
+      !std::is_const<typename std::remove_reference<decltype(*std::declval<Iterator&>())>::type>::value >;
+
+template<typename Iterator>
+auto make_move_iterator_if_mutable(const Iterator& it)
+-> decltype(make_move_iterator_if_mutable_impl(it, is_mutable_iterator<Iterator> {}))
+{
+    return make_move_iterator_if_mutable_impl(it, is_mutable_iterator<Iterator> {});
+}
+
 template<value_t> struct external_constructor;
 
 template<>
@@ -174,7 +200,7 @@ struct external_constructor<value_t::array>
         using std::begin;
         using std::end;
 
-        const typename BasicJsonType::json_value value(j.template create<typename BasicJsonType::array_t>(std::make_move_iterator(begin(arr)), std::make_move_iterator(end(arr))));
+        const typename BasicJsonType::json_value value(j.template create<typename BasicJsonType::array_t>(make_move_iterator_if_mutable(begin(arr)), make_move_iterator_if_mutable(end(arr))));
         j.replace_value(value_t::array, value);
     }
 
@@ -235,7 +261,7 @@ struct external_constructor<value_t::object>
         using std::begin;
         using std::end;
 
-        const typename BasicJsonType::json_value value(j.template create<typename BasicJsonType::object_t>(std::make_move_iterator(begin(obj)), std::make_move_iterator(end(obj))));
+        const typename BasicJsonType::json_value value(j.template create<typename BasicJsonType::object_t>(make_move_iterator_if_mutable(begin(obj)), make_move_iterator_if_mutable(end(obj))));
         j.replace_value(value_t::object, value);
     }
 
@@ -413,25 +439,27 @@ using is_movable_container_rvalue = negation<disjunction<
                                     std::is_const<T>,
                                     has_dedicated_to_json<T>,
                                     is_basic_json<T>,
-                                    is_range_view_type<T>,
                                     is_enum_keyed_map_type<T>,
                                     std::is_same<T, std::vector<bool>>>>;
 
-// rvalue array-like containers
+// rvalue array-like containers; object types are ruled out before views are
+// checked, as std::ranges::view<T> for the object_t of an ordered_json would
+// need that ordered_json to be complete (GCC 11, see #3312)
 template<typename BasicJsonType, typename T>
 using is_rvalue_array_to_json = conjunction<is_movable_container_rvalue<T>,
+      negation<is_compatible_object_type<BasicJsonType, T>>,
+      negation<is_range_view_type<T>>,
       is_compatible_array_type<BasicJsonType, T>,
       negation<disjunction<
       std::is_same<T, typename BasicJsonType::array_t>,
       std::is_same<T, typename BasicJsonType::binary_t>,
-      is_compatible_object_type<BasicJsonType, T>,
       is_compatible_string_type<BasicJsonType, T>,
       is_compatible_binary_type<BasicJsonType, T>>>>;
 
 // rvalue containers: their elements are moved instead of copied
 template<typename BasicJsonType, typename CompatibleArrayType,
          enable_if_t<is_rvalue_array_to_json<BasicJsonType, CompatibleArrayType>::value, int> = 0>
-inline void to_json(BasicJsonType& j, CompatibleArrayType && arr)
+inline void to_json(BasicJsonType& j, CompatibleArrayType && arr) // NOLINT(cppcoreguidelines-missing-std-forward)
 {
     external_constructor<value_t::array>::construct_moving(j, arr);
 }
@@ -509,7 +537,8 @@ inline void to_json(BasicJsonType& j, const EnumKeyedMap& map)
 }
 #endif
 
-// rvalue object-like containers
+// rvalue object-like containers (views have no key_type and mapped_type, so
+// they are no compatible object type)
 template<typename BasicJsonType, typename T>
 using is_rvalue_object_to_json = conjunction<is_movable_container_rvalue<T>,
       negation<std::is_same<T, typename BasicJsonType::object_t>>,
@@ -517,7 +546,7 @@ using is_rvalue_object_to_json = conjunction<is_movable_container_rvalue<T>,
 
 template<typename BasicJsonType, typename CompatibleObjectType,
          enable_if_t<is_rvalue_object_to_json<BasicJsonType, CompatibleObjectType>::value, int> = 0>
-inline void to_json(BasicJsonType& j, CompatibleObjectType && obj)
+inline void to_json(BasicJsonType& j, CompatibleObjectType && obj) // NOLINT(cppcoreguidelines-missing-std-forward)
 {
     external_constructor<value_t::object>::construct_moving(j, obj);
 }

include/nlohmann/detail/conversions/zmij.hpp

@@ -185,7 +185,7 @@ JSON_HEDLEY_ALWAYS_INLINE shortest_decimal to_shortest(std::uint64_t bits) noexc
     const uint128_parts p = umul192_hi128(p10.high, p10.low, bin_sig << static_cast<unsigned>(shift));
     std::uint64_t integral = p.high >> static_cast<unsigned>(extra_shift);
     // (no casts in the shifts: MSVC 2015 warns C4554 on them despite the parentheses)
-    constexpr unsigned fractional_low_shift = static_cast<unsigned>(extra_shift);
+    constexpr auto fractional_low_shift = static_cast<unsigned>(extra_shift);
     constexpr unsigned fractional_high_shift = 64u - fractional_low_shift;
     const std::uint64_t fractional = (p.high << fractional_high_shift) | (p.low >> fractional_low_shift);
     std::uint64_t digit = 0;

include/nlohmann/detail/exceptions.hpp

@@ -494,8 +494,7 @@ JSON_HEDLEY_NO_RETURN JSON_HEDLEY_NEVER_INLINE void throw_patch_missing_member(c
     static_cast<void>(string_type);
     static_cast<void>(val);
     // context-sensitive error message
-    const std::string error_msg = (op == "op") ? std::string("operation") : concat("operation '", op, '\'');
+    JSON_THROW(parse_error::create(exception_id::patch_invalid_operation, 0, concat((op == "op") ? std::string("operation") : concat("operation '", op, '\''), string_type ? " must have string member '" : " must have member '", member, "'"), &val));
-    JSON_THROW(parse_error::create(exception_id::patch_invalid_operation, 0, concat(error_msg, string_type ? " must have string member '" : " must have member '", member, "'"), &val));
 }
 
 template<typename StringType, typename BasicJsonType>

include/nlohmann/detail/iterators/iter_impl.hpp

@@ -680,12 +680,12 @@ class iter_impl // NOLINT(cppcoreguidelines-special-member-functions,hicpp-speci
     {
         JSON_ASSERT(m_object != nullptr);
 
-        if (JSON_HEDLEY_LIKELY(m_object->is_object()))
+        if (JSON_HEDLEY_UNLIKELY(!m_object->is_object()))
         {
-            return m_it.object_iterator->first;
+            throw_literal<invalid_iterator>(exception_id::iterator_key_not_object, "cannot use key() for non-object iterators", m_object);
         }
 
-        throw_literal<invalid_iterator>(exception_id::iterator_key_not_object, "cannot use key() for non-object iterators", m_object);
+        return m_it.object_iterator->first;
     }
 
     /*!

include/nlohmann/detail/json_pointer.hpp

@@ -11,6 +11,7 @@
 #include <algorithm> // all_of
 #include <cctype> // isdigit
 #include <cerrno> // errno, ERANGE
+#include <cstddef> // size_t
 #include <cstdlib> // strtoull
 #ifndef JSON_NO_IO
     #include <iosfwd> // ostream
@@ -334,7 +335,7 @@ class json_pointer
                 {
                     break; // not a plain number: let strtoull decide
                 }
-                acc = static_cast<size_type>(acc * 10 + static_cast<size_type>(c - '0'));
+                acc = static_cast<size_type>((acc * 10) + static_cast<size_type>(c - '0'));
                 if (JSON_HEDLEY_UNLIKELY(i == s.size() - 1))
                 {
                     idx = acc;
@@ -529,10 +530,10 @@ class json_pointer
 
         static std::size_t hash_of(std::size_t parent, const string_t& token) noexcept
         {
-            std::size_t h = parent * static_cast<std::size_t>(0x9E3779B97F4A7C15ULL);
+            std::size_t h = parent * static_cast<std::size_t>(0x9E3779B97F4A7C15ULL & (std::numeric_limits<std::size_t>::max)());
             for (std::size_t i = 0; i < token.size(); ++i)
             {
-                h = (h ^ static_cast<unsigned char>(token[i])) * static_cast<std::size_t>(0x100000001B3ULL);
+                h = (h ^ static_cast<unsigned char>(token[i])) * static_cast<std::size_t>(0x100000001B3ULL & (std::numeric_limits<std::size_t>::max)());
             }
             return h ^ (h >> 29u);
         }

include/nlohmann/json.hpp

@@ -29,6 +29,7 @@
 #endif  // JSON_NO_IO
 #include <iterator> // make_move_iterator, random_access_iterator_tag
 #include <limits> // numeric_limits
+#include <map> // map
 #include <memory> // unique_ptr
 #include <set> // swap, operator!=
 #include <stdexcept> // length_error
@@ -754,26 +755,20 @@ private:
         // one level deep); stops at the first structured child it meets
         static bool all_children_leaves(const basic_json& v) noexcept
         {
+            // array_t only needs forward iterators (see custom_array_type)
             if (v.m_data.m_type == value_t::array)
             {
                 const auto& a = *v.m_data.m_value.array;
-                for (auto it = a.rbegin(); it != a.rend(); ++it)
+                return std::all_of(a.begin(), a.end(), [](const basic_json & el)
                 {
-                    if (!has_no_children(*it))
+                    return has_no_children(el);
-                    {
+                });
-                        return false;
-                    }
-                }
-                return true;
             }
-            for (const auto& el : *v.m_data.m_value.object)
+            const auto& o = *v.m_data.m_value.object;
+            return std::all_of(o.begin(), o.end(), [](const typename object_t::value_type & el)
             {
-                if (!has_no_children(el.second))
+                return has_no_children(el.second);
-                {
+            });
-                    return false;
-                }
-            }
-            return true;
         }
 
         // The walk in destroy_container() may take the children of a
@@ -1230,7 +1225,7 @@ public:
     }
 
     template < typename O = object_t, detail::enable_if_t < detail::has_stable_elements<O>::value, int > = 0 >
-    static constexpr std::size_t object_capacity() noexcept
+    std::size_t object_capacity() const noexcept
     {
         return 0;
     }
@@ -1242,7 +1237,7 @@ public:
     }
 
     template < typename O = object_t, detail::enable_if_t < !detail::has_stable_elements<O>::value && !detail::is_nlohmann_ordered_map<O>::value, int > = 0 >
-    static constexpr std::size_t object_capacity() noexcept
+    std::size_t object_capacity() const noexcept
     {
         return detail::unknown_size();
     }
@@ -3043,18 +3038,21 @@ public:
     JSON_HEDLEY_NO_RETURN JSON_HEDLEY_NEVER_INLINE
     static void throw_iterator_range_of_null(const basic_json* obj)
     {
+        static_cast<void>(obj); // unused when JSON_NOEXCEPTION is defined
         JSON_THROW(invalid_iterator::create(detail::exception_id::iterator_range_of_null, detail::concat("cannot construct with iterators from ", obj->type_name()), obj));
     }
 
     JSON_HEDLEY_NO_RETURN JSON_HEDLEY_NEVER_INLINE
     static void throw_incompatible_reference_type(const basic_json& obj)
     {
+        static_cast<void>(obj); // unused when JSON_NOEXCEPTION is defined
         JSON_THROW(type_error::create(detail::exception_id::incompatible_reference_type, detail::concat("incompatible ReferenceType for get_ref, actual type is ", obj.type_name()), &obj));
     }
 
     JSON_HEDLEY_NO_RETURN JSON_HEDLEY_NEVER_INLINE
     static void throw_array_index_exceeds_size_type(size_type idx)
     {
+        static_cast<void>(idx); // unused when JSON_NOEXCEPTION is defined
         JSON_THROW(std::length_error(detail::concat("array index ", std::to_string(idx), " exceeds size_type")));
     }
 
@@ -3062,6 +3060,8 @@ public:
     JSON_HEDLEY_NO_RETURN JSON_HEDLEY_NEVER_INLINE
     static void throw_array_index_out_of_range(size_type idx, const basic_json& j)
     {
+        static_cast<void>(idx); // unused when JSON_NOEXCEPTION is defined
+        static_cast<void>(j);
         JSON_THROW(out_of_range::create(detail::exception_id::array_index_out_of_range, detail::concat("array index ", std::to_string(idx), " is out of range"), &j));
     }
 
@@ -3070,6 +3070,8 @@ public:
     JSON_HEDLEY_NO_RETURN JSON_HEDLEY_NEVER_INLINE
     static void throw_key_not_found(const KeyType& key, const basic_json& j)
     {
+        static_cast<void>(key); // unused when JSON_NOEXCEPTION is defined
+        static_cast<void>(j);
         JSON_THROW(out_of_range::create(detail::exception_id::key_not_found, detail::concat("key '", key, "' not found"), &j));
     }
 
@@ -4893,19 +4895,19 @@ public:
     iterator insert(const_iterator pos, const basic_json& val) // NOLINT(performance-unnecessary-value-param)
     {
         // insert only works for arrays
-        if (JSON_HEDLEY_LIKELY(is_array()))
+        if (JSON_HEDLEY_UNLIKELY(!is_array()))
         {
-            // check if iterator pos fits to this JSON value
+            detail::throw_cannot_use_with(detail::exception_id::insert_wrong_type, "insert()", *this);
-            if (JSON_HEDLEY_UNLIKELY(pos.m_object != this))
-            {
-                detail::throw_literal<invalid_iterator>(detail::exception_id::iterator_from_other_value, "iterator does not fit current value", this);
-            }
-
-            // insert to array and return iterator
-            return insert_iterator(pos, val);
         }
 
-        detail::throw_cannot_use_with(detail::exception_id::insert_wrong_type, "insert()", *this);
+        // check if iterator pos fits to this JSON value
+        if (JSON_HEDLEY_UNLIKELY(pos.m_object != this))
+        {
+            detail::throw_literal<invalid_iterator>(detail::exception_id::iterator_from_other_value, "iterator does not fit current value", this);
+        }
+
+        // insert to array and return iterator
+        return insert_iterator(pos, val);
     }
 
     /// @brief inserts element into array
@@ -4913,21 +4915,21 @@ public:
     iterator insert(const_iterator pos, basic_json&& val) // NOLINT(performance-unnecessary-value-param)
     {
         // insert only works for arrays
-        if (JSON_HEDLEY_LIKELY(is_array()))
+        if (JSON_HEDLEY_UNLIKELY(!is_array()))
         {
-            // check if iterator pos fits to this JSON value
+            detail::throw_cannot_use_with(detail::exception_id::insert_wrong_type, "insert()", *this);
-            if (JSON_HEDLEY_UNLIKELY(pos.m_object != this))
-            {
-                detail::throw_literal<invalid_iterator>(detail::exception_id::iterator_from_other_value, "iterator does not fit current value", this);
-            }
-
-            // moving into a local first keeps this safe even if val aliases
-            // an element of this array
-            basic_json tmp(std::move(val));
-            return insert_iterator(pos, std::move(tmp));
         }
 
-        detail::throw_cannot_use_with(detail::exception_id::insert_wrong_type, "insert()", *this);
+        // check if iterator pos fits to this JSON value
+        if (JSON_HEDLEY_UNLIKELY(pos.m_object != this))
+        {
+            detail::throw_literal<invalid_iterator>(detail::exception_id::iterator_from_other_value, "iterator does not fit current value", this);
+        }
+
+        // moving into a local first keeps this safe even if val aliases
+        // an element of this array
+        basic_json tmp(std::move(val));
+        return insert_iterator(pos, std::move(tmp));
     }
 
     /// @brief inserts copies of element into array
@@ -4935,19 +4937,19 @@ public:
     iterator insert(const_iterator pos, size_type cnt, const basic_json& val) // NOLINT(performance-unnecessary-value-param)
     {
         // insert only works for arrays
-        if (JSON_HEDLEY_LIKELY(is_array()))
+        if (JSON_HEDLEY_UNLIKELY(!is_array()))
         {
-            // check if iterator pos fits to this JSON value
+            detail::throw_cannot_use_with(detail::exception_id::insert_wrong_type, "insert()", *this);
-            if (JSON_HEDLEY_UNLIKELY(pos.m_object != this))
-            {
-                detail::throw_literal<invalid_iterator>(detail::exception_id::iterator_from_other_value, "iterator does not fit current value", this);
-            }
-
-            // insert to array and return iterator
-            return insert_iterator(pos, cnt, val);
         }
 
-        detail::throw_cannot_use_with(detail::exception_id::insert_wrong_type, "insert()", *this);
+        // check if iterator pos fits to this JSON value
+        if (JSON_HEDLEY_UNLIKELY(pos.m_object != this))
+        {
+            detail::throw_literal<invalid_iterator>(detail::exception_id::iterator_from_other_value, "iterator does not fit current value", this);
+        }
+
+        // insert to array and return iterator
+        return insert_iterator(pos, cnt, val);
     }
 
     /// @brief inserts range of elements into array
@@ -5453,7 +5455,7 @@ public:
     // inline fast path for two values of the same non-owning scalar type; anything
     // else falls through to the out-of-line general comparison
 #define JSON_IMPLEMENT_SCALAR_FAST(op, null_result)                                                      \
-    if (lhs.m_data.m_type == rhs.m_data.m_type)                                                          \
+    if (lhs.m_data.m_type == rhs.m_data.m_type) /* NOLINT(readability/braces) */                         \
     {                                                                                                    \
         switch (lhs.m_data.m_type)                                                                       \
         {                                                                                                \

include/nlohmann/ordered_map.hpp

@@ -23,6 +23,7 @@
 #include <nlohmann/detail/abi_macros.hpp>
 #include <nlohmann/detail/macro_scope.hpp>
 #include <nlohmann/detail/meta/type_traits.hpp>
+#include <nlohmann/thirdparty/hedley/hedley.hpp>
 
 NLOHMANN_JSON_NAMESPACE_BEGIN
 

single_include/nlohmann/json.hpp

@@ -29,6 +29,7 @@
 #endif  // JSON_NO_IO
 #include <iterator> // make_move_iterator, random_access_iterator_tag
 #include <limits> // numeric_limits
+#include <map> // map
 #include <memory> // unique_ptr
 #include <set> // swap, operator!=
 #include <stdexcept> // length_error
@@ -5794,8 +5795,7 @@ JSON_HEDLEY_NO_RETURN JSON_HEDLEY_NEVER_INLINE void throw_patch_missing_member(c
     static_cast<void>(string_type);
     static_cast<void>(val);
     // context-sensitive error message
-    const std::string error_msg = (op == "op") ? std::string("operation") : concat("operation '", op, '\'');
+    JSON_THROW(parse_error::create(exception_id::patch_invalid_operation, 0, concat((op == "op") ? std::string("operation") : concat("operation '", op, '\''), string_type ? " must have string member '" : " must have member '", member, "'"), &val));
-    JSON_THROW(parse_error::create(exception_id::patch_invalid_operation, 0, concat(error_msg, string_type ? " must have string member '" : " must have member '", member, "'"), &val));
 }
 
 template<typename StringType, typename BasicJsonType>
@@ -6555,7 +6555,7 @@ NLOHMANN_JSON_NAMESPACE_END
     #include <optional> // optional
 #endif
 
-#include <iterator> // begin, end
+#include <iterator> // begin, end, make_move_iterator, move_iterator
 #include <memory> // allocator_traits
 #include <string> //  basic_string, char_traits
 #include <tuple> // tuple, get
@@ -7204,6 +7204,32 @@ namespace detail
  * leave j with the type of the new value, but the pointer to the destroyed old one.
  */
 
+// a move iterator over the elements of an rvalue container, unless they are
+// const (e.g., std::set): libstdc++ before GCC 5 defines the reference of a
+// std::move_iterator as value_type&&, which cannot bind to a const element
+template<typename Iterator>
+std::move_iterator<Iterator> make_move_iterator_if_mutable_impl(const Iterator& it, std::true_type /*mutable*/)
+{
+    return std::make_move_iterator(it);
+}
+
+template<typename Iterator>
+Iterator make_move_iterator_if_mutable_impl(const Iterator& it, std::false_type /*mutable*/)
+{
+    return it;
+}
+
+template<typename Iterator>
+using is_mutable_iterator = std::integral_constant < bool,
+      !std::is_const<typename std::remove_reference<decltype(*std::declval<Iterator&>())>::type>::value >;
+
+template<typename Iterator>
+auto make_move_iterator_if_mutable(const Iterator& it)
+-> decltype(make_move_iterator_if_mutable_impl(it, is_mutable_iterator<Iterator> {}))
+{
+    return make_move_iterator_if_mutable_impl(it, is_mutable_iterator<Iterator> {});
+}
+
 template<value_t> struct external_constructor;
 
 template<>
@@ -7330,7 +7356,7 @@ struct external_constructor<value_t::array>
         using std::begin;
         using std::end;
 
-        const typename BasicJsonType::json_value value(j.template create<typename BasicJsonType::array_t>(std::make_move_iterator(begin(arr)), std::make_move_iterator(end(arr))));
+        const typename BasicJsonType::json_value value(j.template create<typename BasicJsonType::array_t>(make_move_iterator_if_mutable(begin(arr)), make_move_iterator_if_mutable(end(arr))));
         j.replace_value(value_t::array, value);
     }
 
@@ -7391,7 +7417,7 @@ struct external_constructor<value_t::object>
         using std::begin;
         using std::end;
 
-        const typename BasicJsonType::json_value value(j.template create<typename BasicJsonType::object_t>(std::make_move_iterator(begin(obj)), std::make_move_iterator(end(obj))));
+        const typename BasicJsonType::json_value value(j.template create<typename BasicJsonType::object_t>(make_move_iterator_if_mutable(begin(obj)), make_move_iterator_if_mutable(end(obj))));
         j.replace_value(value_t::object, value);
     }
 
@@ -7569,25 +7595,27 @@ using is_movable_container_rvalue = negation<disjunction<
                                     std::is_const<T>,
                                     has_dedicated_to_json<T>,
                                     is_basic_json<T>,
-                                    is_range_view_type<T>,
                                     is_enum_keyed_map_type<T>,
                                     std::is_same<T, std::vector<bool>>>>;
 
-// rvalue array-like containers
+// rvalue array-like containers; object types are ruled out before views are
+// checked, as std::ranges::view<T> for the object_t of an ordered_json would
+// need that ordered_json to be complete (GCC 11, see #3312)
 template<typename BasicJsonType, typename T>
 using is_rvalue_array_to_json = conjunction<is_movable_container_rvalue<T>,
+      negation<is_compatible_object_type<BasicJsonType, T>>,
+      negation<is_range_view_type<T>>,
       is_compatible_array_type<BasicJsonType, T>,
       negation<disjunction<
       std::is_same<T, typename BasicJsonType::array_t>,
       std::is_same<T, typename BasicJsonType::binary_t>,
-      is_compatible_object_type<BasicJsonType, T>,
       is_compatible_string_type<BasicJsonType, T>,
       is_compatible_binary_type<BasicJsonType, T>>>>;
 
 // rvalue containers: their elements are moved instead of copied
 template<typename BasicJsonType, typename CompatibleArrayType,
          enable_if_t<is_rvalue_array_to_json<BasicJsonType, CompatibleArrayType>::value, int> = 0>
-inline void to_json(BasicJsonType& j, CompatibleArrayType && arr)
+inline void to_json(BasicJsonType& j, CompatibleArrayType && arr) // NOLINT(cppcoreguidelines-missing-std-forward)
 {
     external_constructor<value_t::array>::construct_moving(j, arr);
 }
@@ -7665,7 +7693,8 @@ inline void to_json(BasicJsonType& j, const EnumKeyedMap& map)
 }
 #endif
 
-// rvalue object-like containers
+// rvalue object-like containers (views have no key_type and mapped_type, so
+// they are no compatible object type)
 template<typename BasicJsonType, typename T>
 using is_rvalue_object_to_json = conjunction<is_movable_container_rvalue<T>,
       negation<std::is_same<T, typename BasicJsonType::object_t>>,
@@ -7673,7 +7702,7 @@ using is_rvalue_object_to_json = conjunction<is_movable_container_rvalue<T>,
 
 template<typename BasicJsonType, typename CompatibleObjectType,
          enable_if_t<is_rvalue_object_to_json<BasicJsonType, CompatibleObjectType>::value, int> = 0>
-inline void to_json(BasicJsonType& j, CompatibleObjectType && obj)
+inline void to_json(BasicJsonType& j, CompatibleObjectType && obj) // NOLINT(cppcoreguidelines-missing-std-forward)
 {
     external_constructor<value_t::object>::construct_moving(j, obj);
 }
@@ -20715,12 +20744,12 @@ class iter_impl // NOLINT(cppcoreguidelines-special-member-functions,hicpp-speci
     {
         JSON_ASSERT(m_object != nullptr);
 
-        if (JSON_HEDLEY_LIKELY(m_object->is_object()))
+        if (JSON_HEDLEY_UNLIKELY(!m_object->is_object()))
         {
-            return m_it.object_iterator->first;
+            throw_literal<invalid_iterator>(exception_id::iterator_key_not_object, "cannot use key() for non-object iterators", m_object);
         }
 
-        throw_literal<invalid_iterator>(exception_id::iterator_key_not_object, "cannot use key() for non-object iterators", m_object);
+        return m_it.object_iterator->first;
     }
 
     /*!
@@ -20947,6 +20976,7 @@ NLOHMANN_JSON_NAMESPACE_END
 #include <algorithm> // all_of
 #include <cctype> // isdigit
 #include <cerrno> // errno, ERANGE
+#include <cstddef> // size_t
 #include <cstdlib> // strtoull
 #ifndef JSON_NO_IO
     #include <iosfwd> // ostream
@@ -21277,7 +21307,7 @@ class json_pointer
                 {
                     break; // not a plain number: let strtoull decide
                 }
-                acc = static_cast<size_type>(acc * 10 + static_cast<size_type>(c - '0'));
+                acc = static_cast<size_type>((acc * 10) + static_cast<size_type>(c - '0'));
                 if (JSON_HEDLEY_UNLIKELY(i == s.size() - 1))
                 {
                     idx = acc;
@@ -21472,10 +21502,10 @@ class json_pointer
 
         static std::size_t hash_of(std::size_t parent, const string_t& token) noexcept
         {
-            std::size_t h = parent * static_cast<std::size_t>(0x9E3779B97F4A7C15ULL);
+            std::size_t h = parent * static_cast<std::size_t>(0x9E3779B97F4A7C15ULL & (std::numeric_limits<std::size_t>::max)());
             for (std::size_t i = 0; i < token.size(); ++i)
             {
-                h = (h ^ static_cast<unsigned char>(token[i])) * static_cast<std::size_t>(0x100000001B3ULL);
+                h = (h ^ static_cast<unsigned char>(token[i])) * static_cast<std::size_t>(0x100000001B3ULL & (std::numeric_limits<std::size_t>::max)());
             }
             return h ^ (h >> 29u);
         }
@@ -26454,7 +26484,7 @@ JSON_HEDLEY_ALWAYS_INLINE shortest_decimal to_shortest(std::uint64_t bits) noexc
     const uint128_parts p = umul192_hi128(p10.high, p10.low, bin_sig << static_cast<unsigned>(shift));
     std::uint64_t integral = p.high >> static_cast<unsigned>(extra_shift);
     // (no casts in the shifts: MSVC 2015 warns C4554 on them despite the parentheses)
-    constexpr unsigned fractional_low_shift = static_cast<unsigned>(extra_shift);
+    constexpr auto fractional_low_shift = static_cast<unsigned>(extra_shift);
     constexpr unsigned fractional_high_shift = 64u - fractional_low_shift;
     const std::uint64_t fractional = (p.high << fractional_high_shift) | (p.low >> fractional_low_shift);
     std::uint64_t digit = 0;
@@ -29704,6 +29734,8 @@ NLOHMANN_JSON_NAMESPACE_END
 
 // #include <nlohmann/detail/meta/type_traits.hpp>
 
+// #include <nlohmann/thirdparty/hedley/hedley.hpp>
+
 
 NLOHMANN_JSON_NAMESPACE_BEGIN
 
@@ -30788,26 +30820,20 @@ private:
         // one level deep); stops at the first structured child it meets
         static bool all_children_leaves(const basic_json& v) noexcept
         {
+            // array_t only needs forward iterators (see custom_array_type)
             if (v.m_data.m_type == value_t::array)
             {
                 const auto& a = *v.m_data.m_value.array;
-                for (auto it = a.rbegin(); it != a.rend(); ++it)
+                return std::all_of(a.begin(), a.end(), [](const basic_json & el)
                 {
-                    if (!has_no_children(*it))
+                    return has_no_children(el);
-                    {
+                });
-                        return false;
-                    }
-                }
-                return true;
             }
-            for (const auto& el : *v.m_data.m_value.object)
+            const auto& o = *v.m_data.m_value.object;
+            return std::all_of(o.begin(), o.end(), [](const typename object_t::value_type & el)
             {
-                if (!has_no_children(el.second))
+                return has_no_children(el.second);
-                {
+            });
-                    return false;
-                }
-            }
-            return true;
         }
 
         // The walk in destroy_container() may take the children of a
@@ -31264,7 +31290,7 @@ public:
     }
 
     template < typename O = object_t, detail::enable_if_t < detail::has_stable_elements<O>::value, int > = 0 >
-    static constexpr std::size_t object_capacity() noexcept
+    std::size_t object_capacity() const noexcept
     {
         return 0;
     }
@@ -31276,7 +31302,7 @@ public:
     }
 
     template < typename O = object_t, detail::enable_if_t < !detail::has_stable_elements<O>::value && !detail::is_nlohmann_ordered_map<O>::value, int > = 0 >
-    static constexpr std::size_t object_capacity() noexcept
+    std::size_t object_capacity() const noexcept
     {
         return detail::unknown_size();
     }
@@ -33077,18 +33103,21 @@ public:
     JSON_HEDLEY_NO_RETURN JSON_HEDLEY_NEVER_INLINE
     static void throw_iterator_range_of_null(const basic_json* obj)
     {
+        static_cast<void>(obj); // unused when JSON_NOEXCEPTION is defined
         JSON_THROW(invalid_iterator::create(detail::exception_id::iterator_range_of_null, detail::concat("cannot construct with iterators from ", obj->type_name()), obj));
     }
 
     JSON_HEDLEY_NO_RETURN JSON_HEDLEY_NEVER_INLINE
     static void throw_incompatible_reference_type(const basic_json& obj)
     {
+        static_cast<void>(obj); // unused when JSON_NOEXCEPTION is defined
         JSON_THROW(type_error::create(detail::exception_id::incompatible_reference_type, detail::concat("incompatible ReferenceType for get_ref, actual type is ", obj.type_name()), &obj));
     }
 
     JSON_HEDLEY_NO_RETURN JSON_HEDLEY_NEVER_INLINE
     static void throw_array_index_exceeds_size_type(size_type idx)
     {
+        static_cast<void>(idx); // unused when JSON_NOEXCEPTION is defined
         JSON_THROW(std::length_error(detail::concat("array index ", std::to_string(idx), " exceeds size_type")));
     }
 
@@ -33096,6 +33125,8 @@ public:
     JSON_HEDLEY_NO_RETURN JSON_HEDLEY_NEVER_INLINE
     static void throw_array_index_out_of_range(size_type idx, const basic_json& j)
     {
+        static_cast<void>(idx); // unused when JSON_NOEXCEPTION is defined
+        static_cast<void>(j);
         JSON_THROW(out_of_range::create(detail::exception_id::array_index_out_of_range, detail::concat("array index ", std::to_string(idx), " is out of range"), &j));
     }
 
@@ -33104,6 +33135,8 @@ public:
     JSON_HEDLEY_NO_RETURN JSON_HEDLEY_NEVER_INLINE
     static void throw_key_not_found(const KeyType& key, const basic_json& j)
     {
+        static_cast<void>(key); // unused when JSON_NOEXCEPTION is defined
+        static_cast<void>(j);
         JSON_THROW(out_of_range::create(detail::exception_id::key_not_found, detail::concat("key '", key, "' not found"), &j));
     }
 
@@ -34927,19 +34960,19 @@ public:
     iterator insert(const_iterator pos, const basic_json& val) // NOLINT(performance-unnecessary-value-param)
     {
         // insert only works for arrays
-        if (JSON_HEDLEY_LIKELY(is_array()))
+        if (JSON_HEDLEY_UNLIKELY(!is_array()))
         {
-            // check if iterator pos fits to this JSON value
+            detail::throw_cannot_use_with(detail::exception_id::insert_wrong_type, "insert()", *this);
-            if (JSON_HEDLEY_UNLIKELY(pos.m_object != this))
-            {
-                detail::throw_literal<invalid_iterator>(detail::exception_id::iterator_from_other_value, "iterator does not fit current value", this);
-            }
-
-            // insert to array and return iterator
-            return insert_iterator(pos, val);
         }
 
-        detail::throw_cannot_use_with(detail::exception_id::insert_wrong_type, "insert()", *this);
+        // check if iterator pos fits to this JSON value
+        if (JSON_HEDLEY_UNLIKELY(pos.m_object != this))
+        {
+            detail::throw_literal<invalid_iterator>(detail::exception_id::iterator_from_other_value, "iterator does not fit current value", this);
+        }
+
+        // insert to array and return iterator
+        return insert_iterator(pos, val);
     }
 
     /// @brief inserts element into array
@@ -34947,21 +34980,21 @@ public:
     iterator insert(const_iterator pos, basic_json&& val) // NOLINT(performance-unnecessary-value-param)
     {
         // insert only works for arrays
-        if (JSON_HEDLEY_LIKELY(is_array()))
+        if (JSON_HEDLEY_UNLIKELY(!is_array()))
         {
-            // check if iterator pos fits to this JSON value
+            detail::throw_cannot_use_with(detail::exception_id::insert_wrong_type, "insert()", *this);
-            if (JSON_HEDLEY_UNLIKELY(pos.m_object != this))
-            {
-                detail::throw_literal<invalid_iterator>(detail::exception_id::iterator_from_other_value, "iterator does not fit current value", this);
-            }
-
-            // moving into a local first keeps this safe even if val aliases
-            // an element of this array
-            basic_json tmp(std::move(val));
-            return insert_iterator(pos, std::move(tmp));
         }
 
-        detail::throw_cannot_use_with(detail::exception_id::insert_wrong_type, "insert()", *this);
+        // check if iterator pos fits to this JSON value
+        if (JSON_HEDLEY_UNLIKELY(pos.m_object != this))
+        {
+            detail::throw_literal<invalid_iterator>(detail::exception_id::iterator_from_other_value, "iterator does not fit current value", this);
+        }
+
+        // moving into a local first keeps this safe even if val aliases
+        // an element of this array
+        basic_json tmp(std::move(val));
+        return insert_iterator(pos, std::move(tmp));
     }
 
     /// @brief inserts copies of element into array
@@ -34969,19 +35002,19 @@ public:
     iterator insert(const_iterator pos, size_type cnt, const basic_json& val) // NOLINT(performance-unnecessary-value-param)
     {
         // insert only works for arrays
-        if (JSON_HEDLEY_LIKELY(is_array()))
+        if (JSON_HEDLEY_UNLIKELY(!is_array()))
         {
-            // check if iterator pos fits to this JSON value
+            detail::throw_cannot_use_with(detail::exception_id::insert_wrong_type, "insert()", *this);
-            if (JSON_HEDLEY_UNLIKELY(pos.m_object != this))
-            {
-                detail::throw_literal<invalid_iterator>(detail::exception_id::iterator_from_other_value, "iterator does not fit current value", this);
-            }
-
-            // insert to array and return iterator
-            return insert_iterator(pos, cnt, val);
         }
 
-        detail::throw_cannot_use_with(detail::exception_id::insert_wrong_type, "insert()", *this);
+        // check if iterator pos fits to this JSON value
+        if (JSON_HEDLEY_UNLIKELY(pos.m_object != this))
+        {
+            detail::throw_literal<invalid_iterator>(detail::exception_id::iterator_from_other_value, "iterator does not fit current value", this);
+        }
+
+        // insert to array and return iterator
+        return insert_iterator(pos, cnt, val);
     }
 
     /// @brief inserts range of elements into array
@@ -35487,7 +35520,7 @@ public:
     // inline fast path for two values of the same non-owning scalar type; anything
     // else falls through to the out-of-line general comparison
 #define JSON_IMPLEMENT_SCALAR_FAST(op, null_result)                                                      \
-    if (lhs.m_data.m_type == rhs.m_data.m_type)                                                          \
+    if (lhs.m_data.m_type == rhs.m_data.m_type) /* NOLINT(readability/braces) */                         \
     {                                                                                                    \
         switch (lhs.m_data.m_type)                                                                       \
         {                                                                                                \

tests/src/unit-constructor2.cpp

@@ -198,11 +198,11 @@ TEST_CASE("copy constructor and destructor across value types")
         const json src_uint = 7u;
         const json src_float = 2.5;
 
-        json c_null(src_null);
+        json c_null(src_null); // NOLINT(performance-unnecessary-copy-initialization): tests the copy constructor
-        json c_bool(src_bool);
+        json c_bool(src_bool); // NOLINT(performance-unnecessary-copy-initialization): tests the copy constructor
-        json c_int(src_int);
+        json c_int(src_int); // NOLINT(performance-unnecessary-copy-initialization): tests the copy constructor
-        json c_uint(src_uint);
+        json c_uint(src_uint); // NOLINT(performance-unnecessary-copy-initialization): tests the copy constructor
-        json c_float(src_float);
+        json c_float(src_float); // NOLINT(performance-unnecessary-copy-initialization): tests the copy constructor
 
         CHECK(c_null.is_null());
         CHECK(c_bool == true);
@@ -300,12 +300,12 @@ TEST_CASE("copy constructor and destructor across value types")
             REQUIRE(v.size() == 70);
 
             std::vector<json> copy(v);
-            CHECK(copy == v);
+            CHECK((copy == v));
 
             // mutating the copy leaves the original alone
             copy[5] = "changed";
             copy[6].push_back(1);
-            CHECK(copy != v);
+            CHECK((copy != v));
             CHECK(v[5] == std::string(5, 'x'));
             CHECK(v[6].size() == 3);
 

tests/src/unit-diagnostics.cpp

@@ -817,8 +817,8 @@ template<class Key, class T, class IgnoredLess = std::less<Key>,
              struct relocating_map : nlohmann::ordered_map<Key, T, IgnoredLess, Allocator>
 {
     using base_type = nlohmann::ordered_map<Key, T, IgnoredLess, Allocator>;
-    using typename base_type::iterator;
+    using iterator = typename base_type::iterator;
-    using typename base_type::Container;
+    using Container = typename base_type::Container;
     using base_type::base_type;
 
     template<typename... Args>

tests/src/unit-iterators1.cpp

@@ -1637,6 +1637,7 @@ TEST_CASE_TEMPLATE("reverse iteration and member access", Json, nlohmann::json,
     {
         Json j = {1, 2, 3, 4};
 
+        const std::vector<int> reversed = {4, 3, 2, 1};
         auto it = j.end();
         std::vector<int> seen;
         while (it != j.begin())
@@ -1644,7 +1645,7 @@ TEST_CASE_TEMPLATE("reverse iteration and member access", Json, nlohmann::json,
             --it;
             seen.push_back(it->template get<int>());
         }
-        CHECK(seen == std::vector<int> {4, 3, 2, 1});
+        CHECK(seen == reversed);
 
         auto it2 = j.end();
         auto old = it2--;
@@ -1656,14 +1657,14 @@ TEST_CASE_TEMPLATE("reverse iteration and member access", Json, nlohmann::json,
         {
             seen.push_back(r->template get<int>());
         }
-        CHECK(seen == std::vector<int> {4, 3, 2, 1});
+        CHECK(seen == reversed);
 
         seen.clear();
         for (auto r = j.crbegin(); r != j.crend(); ++r)
         {
-            seen.push_back(*r);
+            seen.push_back(r->template get<int>());
         }
-        CHECK(seen == std::vector<int> {4, 3, 2, 1});
+        CHECK(seen == reversed);
     }
 
     SECTION("object: -- and rbegin/rend")

tests/src/unit-json_pointer.cpp

@@ -1230,11 +1230,11 @@ TEST_CASE("JSON pointer array index tokens match strtoull semantics")
 
     SECTION("random tokens")
     {
-        std::mt19937 gen(42);
+        std::mt19937 gen(42); // NOLINT(cert-msc32-c,cert-msc51-cpp,bugprone-random-generator-seed): reproducible
         const std::string alphabet = "0123456789012345678901234567890123456789-+ ex";
         for (int i = 0; i < 5000; ++i)
         {
-            std::string token(static_cast<std::size_t>(gen() % 23), '0');
+            std::string token(gen() % 23, '0');
             for (auto& c : token)
             {
                 c = alphabet[gen() % alphabet.size()];

tests/src/unit-serialization.cpp

@@ -1374,7 +1374,13 @@ void check_dump_against_reference(const std::string& s, const bool with_strict =
     };
     for (const auto error_handler : error_handlers)
     {
+#if defined(JSON_NOEXCEPTION)
+        // a strict dump of invalid UTF-8 calls std::abort() instead of throwing
+        static_cast<void>(with_strict);
+        if (error_handler == json::error_handler_t::strict)
+#else
         if (!with_strict && error_handler == json::error_handler_t::strict)
+#endif
         {
             continue;
         }
@@ -1429,7 +1435,7 @@ TEST_CASE("invalid UTF-8 at every position is handled like the reference")
         "\xF4\x90\x80\x80",
         // sequences cut short by ASCII, a control character, a quote, a
         // backslash, DEL, or the lead byte of a well-formed character
-        "\xC3" "a", "\xE2\x82" "\n", "\xE2\x82\"", "\xF0\x9F\x98\\", "\xC3\x7F", "\xC3\xC3\xA4", "\xE2\xF0\x9F\x98\x80",
+        "\xC3" "a", "\xE2\x82" "\n", "\xE2\x82\"", "\xF0\x9F\x98\\", "\xC3\x7F", "\xC3\xC3\xA4", "\xE2\xF0\x9F\x98\x80", // NOLINT(bugprone-suspicious-missing-comma): "\xC3" "a" ends the hex escape
         // truncated sequences
         "\xC3", "\xE2\x82", "\xF0\x9F\x98"
     };
@@ -1489,7 +1495,7 @@ TEST_CASE("invalid UTF-8 at every position is handled like the reference")
                 {
                     for (const auto& pattern : patterns)
                     {
-                        check_dump_against_reference(make_string(filler, pos, pattern, length - pos), bytes <= (filler.size() == 1 ? 17 : 8));
+                        check_dump_against_reference(make_string(filler, pos, pattern, length - pos), bytes <= (filler.size() == 1 ? 17u : 8u));
                     }
                 }
             }

tests/src/unit-testsuites.cpp

@@ -218,7 +218,11 @@ TEST_CASE("compliance tests from nativejson-benchmark")
             n1e308[0] = '[';
             n1e308[1] = '1';
             n1e308[310] = ']';
+#if JSON_STRICT_NUL_HANDLING
+            n1e308.resize(311); // a NUL byte after the value is a syntax error in strict mode
+#else
             n1e308[311] = '\0';
+#endif
             TEST_DOUBLE(n1e308, 1E308);
         }
 

tests/src/unit-throw_messages.cpp

@@ -54,8 +54,8 @@ TEST_CASE("exception messages of out-of-line throw sites")
 
     SECTION("at")
     {
-        const json carr = arr;
+        const json& carr = arr;
-        const json cobj = obj;
+        const json& cobj = obj;
         CHECK_MSG((void)arr.at(static_cast<json::size_type>(10)), "[json.exception.out_of_range.401] array index 10 is out of range");
         CHECK_MSG((void)carr.at(static_cast<json::size_type>(3)), "[json.exception.out_of_range.401] array index 3 is out of range");
         CHECK_MSG((void)num.at(static_cast<json::size_type>(0)), "[json.exception.type_error.304] cannot use at() with number");
@@ -65,7 +65,7 @@ TEST_CASE("exception messages of out-of-line throw sites")
         CHECK_MSG((void)num.at("a"), "[json.exception.type_error.304] cannot use at() with number");
 
         nlohmann::ordered_json oobj = {{"a", 1}};
-        const nlohmann::ordered_json coobj = oobj;
+        const nlohmann::ordered_json& coobj = oobj;
         CHECK_MSG((void)oobj.at("z"), "[json.exception.out_of_range.403] key 'z' not found");
         CHECK_MSG((void)coobj.at("z"), "[json.exception.out_of_range.403] key 'z' not found");
         CHECK_MSG((void)coobj.at(std::string("zz")), "[json.exception.out_of_range.403] key 'zz' not found");
@@ -94,9 +94,10 @@ TEST_CASE("exception messages of out-of-line throw sites")
         CHECK_MSG(obj.update(arr.begin(), arr2.end()), "[json.exception.invalid_iterator.210] iterators do not fit");
     }
 
+#if !defined(JSON_NOEXCEPTION) // patch_msg() catches the exceptions, which JSON_NOEXCEPTION turns into std::abort()
     SECTION("patch")
     {
-        const auto patch_msg = [](const char* doc, const char* patch)
+        const auto patch_msg = [](const char* doc, const char* patch) -> std::string
         {
             try
             {
@@ -105,16 +106,23 @@ TEST_CASE("exception messages of out-of-line throw sites")
             }
             catch (const json::exception& e)
             {
-                // with JSON_DIAGNOSTICS, what() names the offending value like "(/0) "; drop it
+                // with JSON_DIAGNOSTICS, what() names the offending value like "(/0) ",
+                // and with JSON_DIAGNOSTIC_POSITIONS its position like "(bytes 0-2) "; drop both
                 std::string msg = e.what();
-                const auto pos = msg.find(" (/");
+                for (const char* marker :
-                if (pos != std::string::npos)
+            {
+                " (/", " (bytes "
+            })
                 {
-                    msg.erase(pos + 1, msg.find(") ", pos) - pos + 1);
+                    const auto pos = msg.find(marker);
+                    if (pos != std::string::npos)
+                    {
+                        msg.erase(pos + 1, msg.find(") ", pos) - pos + 1);
+                    }
                 }
                 return msg;
             }
-            return std::string();
+            return {};
         };
 
         CHECK(patch_msg("{}", "{}") == "[json.exception.parse_error.104] parse error: JSON patch must be an array of objects");
@@ -132,4 +140,5 @@ TEST_CASE("exception messages of out-of-line throw sites")
         CHECK(patch_msg("{\"a\":1}", "[{\"op\":\"test\",\"path\":\"/a\",\"value\":2}]") == "[json.exception.other_error.501] unsuccessful: {\"op\":\"test\",\"path\":\"/a\",\"value\":2}");
         CHECK(patch_msg("{\"a\":1}", "[{\"op\":\"move\",\"path\":\"/a\"}]") == "[json.exception.parse_error.105] parse error: operation 'move' must have member 'from'");
     }
+#endif
 }