From b8529ce4f25018cc2adfb51eb85c89305f1f327b Mon Sep 17 00:00:00 2001
From: Niels Lohmann <mail@nlohmann.me>
Date: Fri, 9 Oct 2026 23:51:25 +0200
Subject: [PATCH] Make json_view.hpp pass include-what-you-use

Mark the includes that are needed by design (json.hpp, the macro
unscope, <tuple> for the tuple_size specialization), take size_t from
<cstring>, and drop the forward declaration of basic_json_document that
the friend declaration makes redundant.

Signed-off-by: Niels Lohmann <mail@nlohmann.me>
---
 include/nlohmann/json_view.hpp | 22 +++-------------------
 1 file changed, 3 insertions(+), 19 deletions(-)

diff --git a/include/nlohmann/json_view.hpp b/include/nlohmann/json_view.hpp
index ef7261002..8f95d38f5 100644
--- a/include/nlohmann/json_view.hpp
+++ b/include/nlohmann/json_view.hpp
@@ -24,14 +24,12 @@
 #ifndef INCLUDE_NLOHMANN_JSON_VIEW_HPP_
 #define INCLUDE_NLOHMANN_JSON_VIEW_HPP_
 
-#include <array> // array
-#include <cstddef> // nullptr_t, size_t // IWYU pragma: keep
-#include <cstring> // memcpy, strlen
+#include <cstring> // memcpy, size_t, strlen
 #include <iterator> // distance, input_iterator_tag, iterator_traits
 #include <map> // map
 #include <memory> // unique_ptr
 #include <string> // string
-#include <tuple> // tuple_element, tuple_size
+#include <tuple> // tuple_element, tuple_size // IWYU pragma: keep
 #include <type_traits> // decay, enable_if, integral_constant, is_arithmetic, is_base_of, is_integral, is_same, remove_cv, remove_extent
 #include <unordered_map> // unordered_map
 #include <utility> // forward, move
@@ -39,20 +37,6 @@
 
 #include <nlohmann/json.hpp> // IWYU pragma: export
 
-// json.hpp provides the library's types and macros used below (it includes
-// the headers that define them); json_view.hpp must not include them again,
-// because the amalgamated json_view.hpp only includes json.hpp
-// IWYU pragma: no_include <version>
-// IWYU pragma: no_include "nlohmann/detail/abi_config.hpp"
-// IWYU pragma: no_include "nlohmann/detail/abi_macros.hpp"
-// IWYU pragma: no_include "nlohmann/detail/input/input_adapters.hpp"
-// IWYU pragma: no_include "nlohmann/detail/json_pointer.hpp"
-// IWYU pragma: no_include "nlohmann/detail/meta/cpp_future.hpp"
-// IWYU pragma: no_include "nlohmann/detail/string_concat.hpp"
-// IWYU pragma: no_include "nlohmann/detail/value_t.hpp"
-// IWYU pragma: no_include "nlohmann/json.hpp"
-// IWYU pragma: no_include "nlohmann/json_fwd.hpp"
-
 // the view builds on internals of the library: both must be the same version
 #if NLOHMANN_JSON_VERSION_MAJOR != 3 || NLOHMANN_JSON_VERSION_MINOR != 12 || NLOHMANN_JSON_VERSION_PATCH != 0
     #error "json_view.hpp requires json.hpp of the same version (3.12.0)"
@@ -1086,6 +1070,6 @@ class tuple_element<N, ::nlohmann::detail::view::view_item<View>> // NOLINT(cert
 
 }  // namespace std
 
-#include <nlohmann/detail/view/macro_unscope.hpp>
+#include <nlohmann/detail/view/macro_unscope.hpp> // IWYU pragma: keep
 
 #endif  // INCLUDE_NLOHMANN_JSON_VIEW_HPP_