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#ifndef DATE_TIME_C_TIME_HPP___
#define DATE_TIME_C_TIME_HPP___
/* Copyright (c) 2002,2003,2005 CrystalClear Software, Inc.
* Use, modification and distribution is subject to the
* Boost Software License, Version 1.0. (See accompanying
* file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt)
* Author: Jeff Garland, Bart Garst
* $Date: 2012-09-22 09:04:10 -0700 (Sat, 22 Sep 2012) $
*/
/*! @file c_time.hpp
Provide workarounds related to the ctime header
*/
#include <ctime>
#include <string> // to be able to convert from string literals to exceptions
#include <stdexcept>
#include <boost/throw_exception.hpp>
#include <boost/date_time/compiler_config.hpp>
//Work around libraries that don't put time_t and time in namespace std
#ifdef BOOST_NO_STDC_NAMESPACE
namespace std { using ::time_t; using ::time; using ::localtime;
using ::tm; using ::gmtime; }
#endif // BOOST_NO_STDC_NAMESPACE
//The following is used to support high precision time clocks
#ifdef BOOST_HAS_GETTIMEOFDAY
#include <sys/time.h>
#endif
#ifdef BOOST_HAS_FTIME
#include <time.h>
#endif
namespace boost {
namespace date_time {
//! Provides a uniform interface to some 'ctime' functions
/*! Provides a uniform interface to some ctime functions and
* their '_r' counterparts. The '_r' functions require a pointer to a
* user created std::tm struct whereas the regular functions use a
* staticly created struct and return a pointer to that. These wrapper
* functions require the user to create a std::tm struct and send in a
* pointer to it. This struct may be used to store the resulting time.
* The returned pointer may or may not point to this struct, however,
* it will point to the result of the corresponding function.
* All functions do proper checking of the C function results and throw
* exceptions on error. Therefore the functions will never return NULL.
*/
struct c_time {
public:
#if defined(BOOST_DATE_TIME_HAS_REENTRANT_STD_FUNCTIONS)
//! requires a pointer to a user created std::tm struct
inline
static std::tm* localtime(const std::time_t* t, std::tm* result)
{
// localtime_r() not in namespace std???
#if defined(__VMS) && __INITIAL_POINTER_SIZE == 64
std::tm tmp;
if(!localtime_r(t,&tmp))
result = 0;
else
*result = tmp;
#else
result = localtime_r(t, result);
#endif
if (!result)
boost::throw_exception(std::runtime_error("could not convert calendar time to local time"));
return result;
}
//! requires a pointer to a user created std::tm struct
inline
static std::tm* gmtime(const std::time_t* t, std::tm* result)
{
// gmtime_r() not in namespace std???
#if defined(__VMS) && __INITIAL_POINTER_SIZE == 64
std::tm tmp;
if(!gmtime_r(t,&tmp))
result = 0;
else
*result = tmp;
#else
result = gmtime_r(t, result);
#endif
if (!result)
boost::throw_exception(std::runtime_error("could not convert calendar time to UTC time"));
return result;
}
#else // BOOST_HAS_THREADS
#if (defined(_MSC_VER) && (_MSC_VER >= 1400))
#pragma warning(push) // preserve warning settings
#pragma warning(disable : 4996) // disable depricated localtime/gmtime warning on vc8
#endif // _MSC_VER >= 1400
//! requires a pointer to a user created std::tm struct
inline
static std::tm* localtime(const std::time_t* t, std::tm* result)
{
result = std::localtime(t);
if (!result)
boost::throw_exception(std::runtime_error("could not convert calendar time to local time"));
return result;
}
//! requires a pointer to a user created std::tm struct
inline
static std::tm* gmtime(const std::time_t* t, std::tm* result)
{
result = std::gmtime(t);
if (!result)
boost::throw_exception(std::runtime_error("could not convert calendar time to UTC time"));
return result;
}
#if (defined(_MSC_VER) && (_MSC_VER >= 1400))
#pragma warning(pop) // restore warnings to previous state
#endif // _MSC_VER >= 1400
#endif // BOOST_HAS_THREADS
};
}} // namespaces
#endif // DATE_TIME_C_TIME_HPP___
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