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Make json_view.hpp pass include-what-you-use

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ci_single_binaries runs IWYU with --error on every header. For json_view.hpp
it suggested adding <array> (std::array is used), the headers that json.hpp
already provides (abi_config, abi_macros, input_adapters, json_pointer,
cpp_future, string_concat, value_t, json_fwd), and <version> for
std::nullptr_t, and removing <cstddef>.

- include <array>
- keep <cstddef> (nullptr_t, size_t; IWYU attributes them to <version> and <cstring>)
- tell IWYU not to suggest the headers that json.hpp provides: the amalgamated
  json_view.hpp only includes json.hpp, so including them here would duplicate
  their definitions
- export json.hpp, keep macro_unscope.hpp, and drop the unused forward declaration of the document class

Signed-off-by: Niels Lohmann <mail@nlohmann.me>
This commit is contained in:
Niels Lohmann committed 2026-10-10 21:56:34 +02:00
1 parent fbaa2f513e
commit 653eb310f8
2 files changed
+42 -15
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include/nlohmann/json_view.hpp
+18 -6
View File
@@ -24,7 +24,8 @@
#ifndef INCLUDE_NLOHMANN_JSON_VIEW_HPP_
#define INCLUDE_NLOHMANN_JSON_VIEW_HPP_
#include <cstddef> // size_t
#include <array> // array
#include <cstddef> // nullptr_t, size_t // IWYU pragma: keep
#include <cstring> // memcpy, strlen
#include <iterator> // distance, input_iterator_tag, iterator_traits
#include <memory> // unique_ptr
@@ -32,7 +33,21 @@
#include <type_traits> // enable_if, integral_constant, is_base_of, is_integral, is_same, remove_cv, remove_extent
#include <utility> // forward, move
#include <nlohmann/json.hpp>
#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
@@ -50,9 +65,6 @@
NLOHMANN_JSON_NAMESPACE_BEGIN
template<typename BasicJsonType>
class basic_json_document;
/*!
@brief read-only handle to one value of a basic_json_document
@@ -607,6 +619,6 @@ using ordered_json_view = basic_json_view<ordered_json>;
NLOHMANN_JSON_NAMESPACE_END
#include <nlohmann/detail/view/macro_unscope.hpp>
#include <nlohmann/detail/view/macro_unscope.hpp> // IWYU pragma: keep
#endif // INCLUDE_NLOHMANN_JSON_VIEW_HPP_
single_include/nlohmann/json_view.hpp
+24 -9
View File
@@ -24,7 +24,8 @@
#ifndef INCLUDE_NLOHMANN_JSON_VIEW_HPP_
#define INCLUDE_NLOHMANN_JSON_VIEW_HPP_
#include <cstddef> // size_t
#include <array> // array
#include <cstddef> // nullptr_t, size_t // IWYU pragma: keep
#include <cstring> // memcpy, strlen
#include <iterator> // distance, input_iterator_tag, iterator_traits
#include <memory> // unique_ptr
@@ -32,7 +33,21 @@
#include <type_traits> // enable_if, integral_constant, is_base_of, is_integral, is_same, remove_cv, remove_extent
#include <utility> // forward, move
#include <nlohmann/json.hpp>
#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
@@ -189,7 +204,10 @@ static_assert(static_cast<std::uint8_t>(value_t::null) == 0 && static_cast<std::
/// The largest input a document accepts, in bytes. Offsets and node counts are
/// 32 bits wide; the limit keeps 16 bytes (the width of the scanner's steps)
/// below 2^32, so that a position one step past the end of the text fits.
static constexpr std::size_t max_input_size = 0xFFFFFFEFu;
constexpr std::size_t max_input_size() noexcept
{
return 0xFFFFFFEFu;
}
/// node flags
struct node_flags
@@ -1690,7 +1708,7 @@ template<typename BasicJsonType>
{
if (f.code == error_code::input_too_large)
{
// (the limit is detail::view::max_input_size: 4 GiB minus 16 bytes)
// (the limit is detail::view::max_input_size(): 4 GiB minus 16 bytes)
NLOHMANN_VIEW_THROW(out_of_range::create(416, "input of 4294967280 bytes or more is not supported by json_document", nullptr));
}
const BasicJsonType accepted = BasicJsonType::parse(src, src + size, nullptr, true, ignore_comments, ignore_trailing_commas);
@@ -2145,9 +2163,6 @@ NLOHMANN_JSON_NAMESPACE_END
NLOHMANN_JSON_NAMESPACE_BEGIN
template<typename BasicJsonType>
class basic_json_document;
/*!
@brief read-only handle to one value of a basic_json_document
@@ -2570,7 +2585,7 @@ class basic_json_document
d.discarded = true;
detail::view::parse_failure failure;
bool ok = false;
if (NLOHMANN_VIEW_UNLIKELY(size > detail::view::max_input_size))
if (NLOHMANN_VIEW_UNLIKELY(size > detail::view::max_input_size()))
{
failure.code = detail::view::error_code::input_too_large;
}
@@ -2724,6 +2739,6 @@ NLOHMANN_JSON_NAMESPACE_END
#undef NLOHMANN_VIEW_THROW
#undef NLOHMANN_VIEW_LITTLE_ENDIAN
#undef NLOHMANN_VIEW_REPEAT16
// IWYU pragma: keep
#endif // INCLUDE_NLOHMANN_JSON_VIEW_HPP_