llvm-project/libcxx/include/ctime

// -*- C++ -*-
//===---------------------------- ctime -----------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#ifndef _LIBCPP_CTIME
#define _LIBCPP_CTIME

/*
    ctime synopsis

Macros:

    NULL
    CLOCKS_PER_SEC
    TIME_UTC // C++17

namespace std
{

Types:

    clock_t
    size_t
    time_t
    tm
    timespec // C++17

clock_t clock();
double difftime(time_t time1, time_t time0);
time_t mktime(tm* timeptr);
time_t time(time_t* timer);
char* asctime(const tm* timeptr);
char* ctime(const time_t* timer);
tm*    gmtime(const time_t* timer);
tm* localtime(const time_t* timer);
size_t strftime(char* restrict s, size_t maxsize, const char* restrict format,
                const tm* restrict timeptr);
int timespec_get( struct timespec *ts, int base); // C++17
}  // std

*/

#include <__config>
#include <time.h>

#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
#pragma GCC system_header
#endif

// FIXME:
// Apple SDKs don't define ::timespec_get unconditionally in C++ mode. This
// should be fixed in future SDKs, but for the time being we need to avoid
// trying to use that declaration when the SDK doesn't provide it. Note that
// we're detecting this here instead of in <__config> because we can't include
// system headers from <__config>, since it leads to circular module dependencies.
// This is also meant to be a very temporary workaround until the SDKs are fixed.
#if defined(__APPLE__)
#   include <sys/cdefs.h>
#   if defined(_LIBCPP_HAS_TIMESPEC_GET) && (__DARWIN_C_LEVEL < __DARWIN_C_FULL)
#       define _LIBCPP_HAS_TIMESPEC_GET_NOT_ACTUALLY_PROVIDED
#   endif
#endif

_LIBCPP_BEGIN_NAMESPACE_STD

using ::clock_t _LIBCPP_USING_IF_EXISTS;
using ::size_t _LIBCPP_USING_IF_EXISTS;
using ::time_t _LIBCPP_USING_IF_EXISTS;
using ::tm _LIBCPP_USING_IF_EXISTS;
#if _LIBCPP_STD_VER > 14 && defined(_LIBCPP_HAS_TIMESPEC_GET)
using ::timespec _LIBCPP_USING_IF_EXISTS;
#endif
using ::clock _LIBCPP_USING_IF_EXISTS;
using ::difftime _LIBCPP_USING_IF_EXISTS;
using ::mktime _LIBCPP_USING_IF_EXISTS;
using ::time _LIBCPP_USING_IF_EXISTS;
#ifndef _LIBCPP_HAS_NO_THREAD_UNSAFE_C_FUNCTIONS
using ::asctime _LIBCPP_USING_IF_EXISTS;
using ::ctime _LIBCPP_USING_IF_EXISTS;
using ::gmtime _LIBCPP_USING_IF_EXISTS;
using ::localtime _LIBCPP_USING_IF_EXISTS;
#endif
using ::strftime _LIBCPP_USING_IF_EXISTS;
#if _LIBCPP_STD_VER > 14 && defined(_LIBCPP_HAS_TIMESPEC_GET) && !defined(_LIBCPP_HAS_TIMESPEC_GET_NOT_ACTUALLY_PROVIDED)
using ::timespec_get _LIBCPP_USING_IF_EXISTS;
#endif

_LIBCPP_END_NAMESPACE_STD

#endif // _LIBCPP_CTIME