mirror of
https://github.com/nlohmann/json.git
synced 2026-09-30 22:15:19 +00:00
be837d5470
The public classes of the zero-copy view (#5295), in the new header <nlohmann/json_view.hpp>: - basic_json_document<BasicJsonType>: parse (borrowing contiguous byte inputs, owning rvalue strings, streams, and other inputs), parse_copy, accept, read, root, is_discarded, source, owns_source, node_count, memory_usage, shrink_to_fit - basic_json_view<BasicJsonType>: type and the is_* queries, size, empty, materialize (the value parse() would produce, built by the same SAX handler), source_offset - the aliases json_document, json_view, ordered_json_document, and ordered_json_view A parse error throws the exception basic_json::parse would throw for the same input: the library parser is run on the failing input, so messages, positions, and exception ids are the same. Inputs of 4 GiB or more are rejected with out_of_range.416. The single header single_include/nlohmann/json_view.hpp keeps including json.hpp; make amalgamate, check-amalgamation, include.zip, and release handle it. Signed-off-by: Niels Lohmann <mail@nlohmann.me>
72 lines
2.9 KiB
C++
72 lines
2.9 KiB
C++
// __ _____ _____ _____
|
|
// __| | __| | | | 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
|
|
|
|
#pragma once
|
|
|
|
// Macros of json_view.hpp and its detail headers. json.hpp undefines its own
|
|
// macros at its end (macro_unscope.hpp), so the view defines the few it needs
|
|
// under its own prefix; json_view.hpp undefines them all at its end
|
|
// (detail/view/macro_unscope.hpp). Configuration that json.hpp undefines is
|
|
// read from detail::abi_config instead.
|
|
|
|
#if (defined(__cplusplus) && __cplusplus >= 201703L) || (defined(_MSVC_LANG) && _MSVC_LANG >= 201703L)
|
|
#define NLOHMANN_VIEW_HAS_CPP_17 1
|
|
#else
|
|
#define NLOHMANN_VIEW_HAS_CPP_17 0
|
|
#endif
|
|
|
|
#if defined(__GNUC__) || defined(__clang__)
|
|
#define NLOHMANN_VIEW_LIKELY(x) __builtin_expect(!!(x), 1)
|
|
#define NLOHMANN_VIEW_UNLIKELY(x) __builtin_expect(!!(x), 0)
|
|
#define NLOHMANN_VIEW_ALWAYS_INLINE inline __attribute__((always_inline))
|
|
#define NLOHMANN_VIEW_NOINLINE __attribute__((noinline))
|
|
#elif defined(_MSC_VER)
|
|
#define NLOHMANN_VIEW_LIKELY(x) (x)
|
|
#define NLOHMANN_VIEW_UNLIKELY(x) (x)
|
|
#define NLOHMANN_VIEW_ALWAYS_INLINE __forceinline
|
|
#define NLOHMANN_VIEW_NOINLINE __declspec(noinline)
|
|
#else
|
|
#define NLOHMANN_VIEW_LIKELY(x) (x)
|
|
#define NLOHMANN_VIEW_UNLIKELY(x) (x)
|
|
#define NLOHMANN_VIEW_ALWAYS_INLINE inline
|
|
#define NLOHMANN_VIEW_NOINLINE
|
|
#endif
|
|
|
|
#if defined(__GNUC__) || defined(__clang__)
|
|
#define NLOHMANN_VIEW_NODISCARD __attribute__((warn_unused_result))
|
|
#elif defined(_MSC_VER)
|
|
#define NLOHMANN_VIEW_NODISCARD _Check_return_
|
|
#else
|
|
#define NLOHMANN_VIEW_NODISCARD
|
|
#endif
|
|
|
|
// exceptions as in json.hpp (JSON_NOEXCEPTION, JSON_THROW_USER)
|
|
#if (defined(__cpp_exceptions) || defined(__EXCEPTIONS) || defined(_CPPUNWIND)) && !defined(JSON_NOEXCEPTION)
|
|
#define NLOHMANN_VIEW_THROW(exception) throw exception
|
|
#else
|
|
#include <cstdlib>
|
|
// (the exception is built first, so that the arguments of the throwing
|
|
// helpers count as used; the program ends anyway)
|
|
#define NLOHMANN_VIEW_THROW(exception) (static_cast<void>(exception), std::abort())
|
|
#endif
|
|
#if defined(JSON_THROW_USER)
|
|
#undef NLOHMANN_VIEW_THROW
|
|
#define NLOHMANN_VIEW_THROW JSON_THROW_USER
|
|
#endif
|
|
|
|
// the parser stores a node's first word at once where the layout of `node` is
|
|
// known to be little-endian (MSVC targets are); elsewhere field by field
|
|
#if (defined(__BYTE_ORDER__) && defined(__ORDER_LITTLE_ENDIAN__) && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__) || defined(_MSC_VER)
|
|
#define NLOHMANN_VIEW_LITTLE_ENDIAN 1
|
|
#else
|
|
#define NLOHMANN_VIEW_LITTLE_ENDIAN 0
|
|
#endif
|
|
|
|
/// sixteen checks at fixed offsets 0..15
|
|
#define NLOHMANN_VIEW_REPEAT16(X) X(0) X(1) X(2) X(3) X(4) X(5) X(6) X(7) X(8) X(9) X(10) X(11) X(12) X(13) X(14) X(15)
|