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Include conceptual change from PR 2001.

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This commit is contained in:
Peter Kasting 2022-05-13 09:09:59 -07:00 committed by Milo Yip
parent 4695953567
commit 88f8ddd70c
1 changed files with 19 additions and 9 deletions
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28
include/rapidjson/document.h
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@ -1230,19 +1230,29 @@ public:
else {
RAPIDJSON_ASSERT(false); // see above note
#if defined(__cplusplus) && (__cplusplus >= 201103L)
// This will generate -Wexit-time-destructors in clang
// static GenericValue NullValue;
// return NullValue;
// Use thread-local storage to prevent races between threads.
#if defined(_MSC_VER) && _MSC_VER < 1900
// MSVC 2013 or earlier does not support `thread_local` attribute even in C++11
// mode.
#define RAPIDJSON_THREAD_LOCAL __declspec(thread)
#elif RAPIDJSON_HAS_CXX11
#define RAPIDJSON_THREAD_LOCAL thread_local
#elif defined(__GNUC__) || defined(__clang__)
#define RAPIDJSON_THREAD_LOCAL __thread
#else
#define RAPIDJSON_THREAD_LOCAL
#endif
// Use static buffer and placement-new to prevent destruction
alignas(GenericValue) static char buffer[sizeof(GenericValue)];
#if RAPIDJSON_HAS_CXX11
// Use static buffer and placement-new to prevent destruction.
alignas(GenericValue) RAPIDJSON_THREAD_LOCAL static char buffer[sizeof(GenericValue)];
return *new (buffer) GenericValue();
#else
static GenericValue buffer;
return *new (reinterpret_cast<char *>(&buffer)) GenericValue();
// This will generate -Wexit-time-destructors in clang.
RAPIDJSON_THREAD_LOCAL static GenericValue buffer;
return buffer;
#endif
}
}
}
template <typename SourceAllocator>
const GenericValue& operator[](const GenericValue<Encoding, SourceAllocator>& name) const { return const_cast<GenericValue&>(*this)[name]; }