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// file : butl/ft/shared_mutex -*- C++ -*-
// copyright : Copyright (c) 2014-2017 Code Synthesis Ltd
// license : MIT; see accompanying LICENSE file
#ifndef BUTL_FT_SHARED_MUTEX
#define BUTL_FT_SHARED_MUTEX
#include <cstddef> // _LIBCPP_VERSION
#include <shared_mutex>
// __cpp_lib_shared_mutex
//
#ifndef __cpp_lib_shared_mutex
//
// VC has it since 1900.
//
# if defined(_MSC_VER)
# if _MSC_VER >= 1900
# define __cpp_lib_shared_mutex 201505
# endif
//
// Clang's libc++ seems to have it for a while (but not before 1200) so we
// assume it's there from 1200. It's also only enabled after C++14. But not
// for MacOS, where it is explicitly marked as unavailable until MacOS
// 10.12.
//
# elif defined(_LIBCPP_VERSION) && defined(_LIBCPP_STD_VER)
# if _LIBCPP_VERSION >= 1200 && \
_LIBCPP_STD_VER > 14 && \
(!defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) || \
__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ >= 101200)
# define __cpp_lib_shared_mutex 201505
# endif
//
// GCC libstdc++ has it since GCC 6 and it defines the feature test macro.
// We will also use this for any other runtime.
//
# endif
#endif
// __cpp_lib_shared_timed_mutex
//
#ifndef __cpp_lib_shared_timed_mutex
//
// On MacOS shared_timed_mutex is marked as unavailable until MacOS
// 10.12.
//
# if defined(_LIBCPP_VERSION)
# if !defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) || \
__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ >= 101200
# define __cpp_lib_shared_timed_mutex 201402
# endif
# else
# define __cpp_lib_shared_timed_mutex 201402
# endif
#endif
#endif // BUTL_FT_SHARED_MUTEX
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