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Make inclusion of header <optional> opt-out via macro (#7168)

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* Allow suppression of including <optional> via macro

* Combine preprocessor conditions

* Make inclusion of header <optional> opt-in

* Make inclusion of <optional> opt-out via macro

* Auto-detect C++17+ when defining macro

* Enclose macro expression in parentheses

* Check value of macro, not whether it's defined

* Fix parentheses

* Don't define macro with expression using other macros

The preprocessor doesn't seem to like it.

* Fix parentheses
This commit is contained in:
David Schneider
2022-03-15 17:52:11 -07:00
committed by GitHub
parent 8468eab83b
commit b8c77d4041
1 changed files with 14 additions and 10 deletions
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24
include/flatbuffers/stl_emulation.h
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@@ -26,16 +26,20 @@
#include <memory>
#include <limits>
// Detect C++17 compatible compiler.
// __cplusplus >= 201703L - a compiler has support of 'static inline' variables.
#if defined(FLATBUFFERS_USE_STD_OPTIONAL) \
|| (defined(__cplusplus) && __cplusplus >= 201703L) \
|| (defined(_MSVC_LANG) && (_MSVC_LANG >= 201703L))
#ifndef FLATBUFFERS_USE_STD_OPTIONAL
// Detect C++17 compatible compiler.
// __cplusplus >= 201703L - a compiler has support of 'static inline' variables.
#if (defined(__cplusplus) && __cplusplus >= 201703L) \
|| (defined(_MSVC_LANG) && _MSVC_LANG >= 201703L)
#define FLATBUFFERS_USE_STD_OPTIONAL 1
#else
#define FLATBUFFERS_USE_STD_OPTIONAL 0
#endif // (defined(__cplusplus) && __cplusplus >= 201703L) ...
#endif // FLATBUFFERS_USE_STD_OPTIONAL
#if FLATBUFFERS_USE_STD_OPTIONAL
#include <optional>
#ifndef FLATBUFFERS_USE_STD_OPTIONAL
#define FLATBUFFERS_USE_STD_OPTIONAL
#endif
#endif // defined(FLATBUFFERS_USE_STD_OPTIONAL) ...
#endif
// The __cpp_lib_span is the predefined feature macro.
#if defined(FLATBUFFERS_USE_STD_SPAN)
@@ -128,7 +132,7 @@ namespace flatbuffers {
};
#endif // defined(FLATBUFFERS_TEMPLATES_ALIASES)
#ifdef FLATBUFFERS_USE_STD_OPTIONAL
#if FLATBUFFERS_USE_STD_OPTIONAL
template<class T>
using Optional = std::optional<T>;
using nullopt_t = std::nullopt_t;