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https://github.com/nlohmann/json.git
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Niels Lohmann
2b2b3fcee7
Parsing from a FILE* still read one character at a time through getc_unlocked(), while a std::istream has its get area scanned in bulk. file_input_adapter now offers the lexer the same kind of window into the buffer of the FILE: it reads the fields that the C library's own getc_unlocked() macro reads (glibc: _IO_read_ptr and _IO_read_end; Apple: _p and _r) and consumes exactly the characters getc_unlocked() would return, so the file is left where it was left before. The part of the current token in a buffer that is about to be refilled is kept for error messages, as for streams. The window needs the file locked for the whole parse, so JSON_DISABLE_UNLOCKED_FILE_IO and MemorySanitizer builds turn it off; uClibc, which defines __GLIBC__ but has other fields, does not get it. parse() from a FILE* gets 2.0-2.6x as fast on an Apple M1 Max and 1.7-2.2x on x86-64 (glibc, GCC 15 and Clang 21), accept() 2.9-4.4x; that is about as fast as parsing from a std::ifstream. The new tests read with FILE buffers of 1 to 70 bytes and unbuffered files, after ungetc(), with SAX positions and with binary strings across the buffer's edges. Signed-off-by: Niels Lohmann <mail@nlohmann.me>
66 lines
1.9 KiB
C++
66 lines
1.9 KiB
C++
// __ _____ _____ _____
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// __| | __| | | | JSON for Modern C++
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// | | |__ | | | | | | version 3.12.0
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// |_____|_____|_____|_|___| https://github.com/nlohmann/json
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//
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// SPDX-FileCopyrightText: 2013-2026 Niels Lohmann <https://nlohmann.me>
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// SPDX-License-Identifier: MIT
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#pragma once
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// clean up
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#undef JSON_ASSERT
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#undef JSON_INTERNAL_CATCH
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#undef JSON_THROW
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#undef JSON_PRIVATE_UNLESS_TESTED
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#undef NLOHMANN_BASIC_JSON_TPL_DECLARATION
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#undef NLOHMANN_BASIC_JSON_TPL
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#undef JSON_EXPLICIT
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#undef NLOHMANN_CAN_CALL_STD_FUNC_IMPL
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#undef JSON_INLINE_VARIABLE
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#undef JSON_NO_UNIQUE_ADDRESS
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#undef JSON_DISABLE_ENUM_SERIALIZATION
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#undef JSON_DISABLE_TUPLE_REFERENCE_CONVERSION
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#undef JSON_UNLOCKED_FILE_IO
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#undef JSON_FILE_WINDOW
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#undef JSON_DTOA_SSE2
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#undef JSON_DTOA_NEON
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#undef JSON_LITTLE_ENDIAN_TARGET
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#undef JSON_BIG_ENDIAN_TARGET
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#undef JSON_SCAN_NEON
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#undef JSON_SCAN_SSE2
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#undef JSON_SCAN_SSSE3
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#undef JSON_SCAN_SSSE3_DISPATCH
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#undef JSON_SCAN_SSSE3_TARGET
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#undef JSON_SCAN_VECTOR
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#undef JSON_SCAN_VECTOR_UTF8
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#ifndef JSON_TEST_KEEP_MACROS
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#undef JSON_CATCH
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#undef JSON_TRY
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#undef JSON_HAS_CPP_11
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#undef JSON_HAS_CPP_14
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#undef JSON_HAS_CPP_17
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#undef JSON_HAS_CPP_20
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#undef JSON_HAS_CPP_23
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#undef JSON_HAS_CPP_26
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#undef JSON_HAS_FILESYSTEM
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#undef JSON_HAS_EXPERIMENTAL_FILESYSTEM
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#undef JSON_HAS_THREE_WAY_COMPARISON
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#undef JSON_HAS_RANGES
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#undef JSON_HAS_RANGE_VIEW_CONVERSION
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#undef JSON_HAS_STD_FORMAT
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#undef JSON_HAS_STATIC_RTTI
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#undef JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON
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#undef JSON_BRACE_INIT_COPY_SEMANTICS
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#undef JSON_PRECISE_STREAM_POSITION
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#undef JSON_STRICT_NUL_HANDLING
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#undef JSON_STRICT_BINARY_UTF8
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#undef JSON_DELETE_DEPRECATED_FUNCTIONS
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#undef JSON_USE_OBJECTS_FOR_ENUM_KEYED_MAPS
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#undef JSON_DISABLE_STREAM_BULK_SCAN
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#undef JSON_DISABLE_UNLOCKED_FILE_IO
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#endif
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#include <nlohmann/thirdparty/hedley/hedley_undef.hpp>
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