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