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Added preprocessor define for C++ if Template Aliases are supported by the compiler

This commit is contained in:
Derek Bailey 2018-07-23 22:51:42 -07:00
parent 6e185d06a7
commit a75af73521
1 changed files with 12 additions and 6 deletions
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18
include/flatbuffers/stl_emulation.h
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@ -68,14 +68,20 @@ inline void vector_emplace_back(std::vector<T> *vector, V &&data) {
#endif // defined(FLATBUFFERS_CPP98_STL)
}
// Check if we can use template aliases
#if !(defined(_MSC_VER) && _MSC_VER <= 1700 /* MSVC2012 */) \
&& (defined(__cpp_alias_templates) && __cpp_alias_templates >= 200704)
#define FLATBUFFERS_TEMPLATES_ALIASES
#endif
#ifndef FLATBUFFERS_CPP98_STL
#if !(defined(_MSC_VER) && _MSC_VER <= 1700 /* MSVC2012 */)
#if defined(FLATBUFFERS_TEMPLATES_ALIASES)
template <typename T>
using numeric_limits = std::numeric_limits<T>;
#else
template <typename T> class numeric_limits :
public std::numeric_limits<T> {};
#endif // !(defined(_MSC_VER) && _MSC_VER <= 1700 /* MSVC2012 */)
#endif // defined(FLATBUFFERS_TEMPLATES_ALIASES)
#else
template <typename T> class numeric_limits :
public std::numeric_limits<T> {};
@ -98,7 +104,7 @@ inline void vector_emplace_back(std::vector<T> *vector, V &&data) {
};
#endif // FLATBUFFERS_CPP98_STL
#if !(defined(_MSC_VER) && _MSC_VER <= 1700 /* MSVC2012 */)
#if defined(FLATBUFFERS_TEMPLATES_ALIASES)
#ifndef FLATBUFFERS_CPP98_STL
template <typename T> using is_scalar = std::is_scalar<T>;
template <typename T, typename U> using is_same = std::is_same<T,U>;
@ -119,10 +125,10 @@ inline void vector_emplace_back(std::vector<T> *vector, V &&data) {
template <typename T> struct is_floating_point :
public std::is_floating_point<T> {};
template <typename T> struct is_unsigned : public std::is_unsigned<T> {};
#endif // !(defined(_MSC_VER) && _MSC_VER <= 1700 /* MSVC2012 */)
#endif // defined(FLATBUFFERS_TEMPLATES_ALIASES)
#ifndef FLATBUFFERS_CPP98_STL
#if !(defined(_MSC_VER) && _MSC_VER <= 1700 /* MSVC2012 */)
#if defined(FLATBUFFERS_TEMPLATES_ALIASES)
template <class T> using unique_ptr = std::unique_ptr<T>;
#else
// MSVC 2010 doesn't support C++11 aliases.
@ -148,7 +154,7 @@ inline void vector_emplace_back(std::vector<T> *vector, V &&data) {
return std::unique_ptr<T>::operator=(p);
}
};
#endif // !(defined(_MSC_VER) && _MSC_VER <= 1700 /* MSVC2012 */)
#endif // defined(FLATBUFFERS_TEMPLATES_ALIASES)
#else
// Very limited implementation of unique_ptr.
// This is provided simply to allow the C++ code generated from the default