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// (C) Copyright Howard Hinnant
// (C) Copyright 2011 Vicente J. Botet Escriba
// Copyright (c) Microsoft Corporation 2014
// Use, modification and distribution are subject to the Boost Software License,
// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt).
//
#ifndef BOOST_CHRONO_IO_TIME_POINT_UNITS_HPP
#define BOOST_CHRONO_IO_TIME_POINT_UNITS_HPP
#include <boost/chrono/config.hpp>
#include <boost/chrono/process_cpu_clocks.hpp>
#include <boost/chrono/system_clocks.hpp>
#include <boost/chrono/thread_clock.hpp>
#include <boost/chrono/io/ios_base_state.hpp>
#include <string>
#include <iosfwd>
#include <ios>
#include <locale>
#include <algorithm>
namespace boost
{
namespace chrono
{
/**
* customization point to the epoch associated to the clock @c Clock
* The default calls @c f.do_get_epoch(Clock()). The user can overload this function.
* @return the string epoch associated to the @c Clock
*/
template <typename CharT, typename Clock, typename TPUFacet>
std::basic_string<CharT> get_epoch_custom(Clock, TPUFacet& f)
{
return f.do_get_epoch(Clock());
}
/**
* @c time_point_units facet gives useful information about the time_point pattern,
* the text associated to a time_point's epoch,
*/
template <typename CharT=char>
class time_point_units: public std::locale::facet
{
public:
/**
* Type of character the facet is instantiated on.
*/
typedef CharT char_type;
/**
* Type of character string used by member functions.
*/
typedef std::basic_string<char_type> string_type;
/**
* Unique identifier for this type of facet.
*/
static std::locale::id id;
/**
* Construct a @c time_point_units facet.
* @param refs
* @Effects Construct a @c time_point_units facet.
* If the @c refs argument is @c 0 then destruction of the object is
* delegated to the @c locale, or locales, containing it. This allows
* the user to ignore lifetime management issues. On the other had,
* if @c refs is @c 1 then the object must be explicitly deleted;
* the @c locale will not do so. In this case, the object can be
* maintained across the lifetime of multiple locales.
*/
explicit time_point_units(size_t refs = 0) :
std::locale::facet(refs)
{
}
/**
* @return the pattern to be used by default.
*/
virtual string_type get_pattern() const =0;
/**
* @return the epoch associated to the clock @c Clock calling @c do_get_epoch(Clock())
*/
template <typename Clock>
string_type get_epoch() const
{
return get_epoch_custom<CharT>(Clock(), *this);
}
protected:
/**
* Destroy the facet.
*/
virtual ~time_point_units() {}
public:
/**
*
* @param c a dummy instance of @c system_clock.
* @return The epoch string associated to the @c system_clock.
*/
virtual string_type do_get_epoch(system_clock) const=0;
/**
*
* @param c a dummy instance of @c steady_clock.
* @return The epoch string associated to the @c steady_clock.
*/
virtual string_type do_get_epoch(steady_clock) const=0;
#if defined(BOOST_CHRONO_HAS_PROCESS_CLOCKS)
/**
*
* @param c a dummy instance of @c process_real_cpu_clock.
* @return The epoch string associated to the @c process_real_cpu_clock.
*/
virtual string_type do_get_epoch(process_real_cpu_clock) const=0;
#if ! BOOST_OS_WINDOWS || BOOST_PLAT_WINDOWS_DESKTOP
/**
*
* @param c a dummy instance of @c process_user_cpu_clock.
* @return The epoch string associated to the @c process_user_cpu_clock.
*/
virtual string_type do_get_epoch(process_user_cpu_clock) const=0;
/**
*
* @param c a dummy instance of @c process_system_cpu_clock.
* @return The epoch string associated to the @c process_system_cpu_clock.
*/
virtual string_type do_get_epoch(process_system_cpu_clock) const=0;
/**
*
* @param c a dummy instance of @c process_cpu_clock.
* @return The epoch string associated to the @c process_cpu_clock.
*/
virtual string_type do_get_epoch(process_cpu_clock) const=0;
#endif
#endif
#if defined(BOOST_CHRONO_HAS_THREAD_CLOCK)
/**
*
* @param c a dummy instance of @c thread_clock.
* @return The epoch string associated to the @c thread_clock.
*/
virtual string_type do_get_epoch(thread_clock) const=0;
#endif
};
template <typename CharT>
std::locale::id time_point_units<CharT>::id;
// This class is used to define the strings for the default English
template <typename CharT=char>
class time_point_units_default: public time_point_units<CharT>
{
public:
/**
* Type of character the facet is instantiated on.
*/
typedef CharT char_type;
/**
* Type of character string returned by member functions.
*/
typedef std::basic_string<char_type> string_type;
explicit time_point_units_default(size_t refs = 0) :
time_point_units<CharT> (refs)
{
}
~time_point_units_default() {}
/**
* @return the default pattern "%d%e".
*/
string_type get_pattern() const
{
static const CharT t[] =
{ '%', 'd', '%', 'e' };
static const string_type pattern(t, t + sizeof (t) / sizeof (t[0]));
return pattern;
}
//protected:
/**
* @param c a dummy instance of @c system_clock.
* @return The epoch string returned by @c clock_string<system_clock,CharT>::since().
*/
string_type do_get_epoch(system_clock ) const
{
return clock_string<system_clock,CharT>::since();
}
/**
* @param c a dummy instance of @c steady_clock.
* @return The epoch string returned by @c clock_string<steady_clock,CharT>::since().
*/
string_type do_get_epoch(steady_clock ) const
{
return clock_string<steady_clock,CharT>::since();
}
#if defined(BOOST_CHRONO_HAS_PROCESS_CLOCKS)
/**
* @param c a dummy instance of @c process_real_cpu_clock.
* @return The epoch string returned by @c clock_string<process_real_cpu_clock,CharT>::since().
*/
string_type do_get_epoch(process_real_cpu_clock ) const
{
return clock_string<process_real_cpu_clock,CharT>::since();
}
#if ! BOOST_OS_WINDOWS || BOOST_PLAT_WINDOWS_DESKTOP
/**
* @param c a dummy instance of @c process_user_cpu_clock.
* @return The epoch string returned by @c clock_string<process_user_cpu_clock,CharT>::since().
*/
string_type do_get_epoch(process_user_cpu_clock ) const
{
return clock_string<process_user_cpu_clock,CharT>::since();
}
/**
* @param c a dummy instance of @c process_system_cpu_clock.
* @return The epoch string returned by @c clock_string<process_system_cpu_clock,CharT>::since().
*/
string_type do_get_epoch(process_system_cpu_clock ) const
{
return clock_string<process_system_cpu_clock,CharT>::since();
}
/**
* @param c a dummy instance of @c process_cpu_clock.
* @return The epoch string returned by @c clock_string<process_cpu_clock,CharT>::since().
*/
string_type do_get_epoch(process_cpu_clock ) const
{
return clock_string<process_cpu_clock,CharT>::since();
}
#endif
#endif
#if defined(BOOST_CHRONO_HAS_THREAD_CLOCK)
/**
* @param c a dummy instance of @c thread_clock.
* @return The epoch string returned by @c clock_string<thread_clock,CharT>::since().
*/
string_type do_get_epoch(thread_clock ) const
{
return clock_string<thread_clock,CharT>::since();
}
#endif
};
} // chrono
} // boost
#endif // header
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