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Updated preprocessor check for template aliases. (#4888)

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This commit is contained in:
Derek Bailey
2018-08-23 09:48:03 -07:00
committed by Wouter van Oortmerssen
parent d8f49e18d7
commit e1f48ad35a
1 changed files with 16 additions and 6 deletions
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22
include/flatbuffers/stl_emulation.h
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@@ -33,6 +33,16 @@
#include <cctype>
#endif // defined(FLATBUFFERS_CPP98_STL)
// Check if we can use template aliases
// Not possible if Microsoft Compiler before 2012
// Possible is the language feature __cpp_alias_templates is defined well
// Or possible if the C++ std is C+11 or newer
#if !(defined(_MSC_VER) && _MSC_VER <= 1700 /* MSVC2012 */) \
&& ((defined(__cpp_alias_templates) && __cpp_alias_templates >= 200704) \
|| (defined(__cplusplus) && __cplusplus >= 201103L))
#define FLATBUFFERS_TEMPLATES_ALIASES
#endif
// This header provides backwards compatibility for C++98 STLs like stlport.
namespace flatbuffers {
@@ -69,13 +79,13 @@ inline void vector_emplace_back(std::vector<T> *vector, V &&data) {
}
#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 +108,7 @@ 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 +129,10 @@ 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 +158,7 @@ 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