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편집 파일: ratio_fwd.hpp

//  ratio_fwd.hpp  ---------------------------------------------------------------//

//  Distributed under the Boost Software License, Version 1.0.
//  See http://www.boost.org/LICENSE_1_0.txt

This code was derived by Beman Dawes from Howard Hinnant's time2_demo prototype.
Many thanks to Howard for making his code available under the Boost license.
The original code was modified to conform to Boost conventions and to section
20.4 Compile-time rational arithmetic [ratio], of the C++ committee working
paper N2798.
See http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2798.pdf.

time2_demo contained this comment:

Much thanks to Andrei Alexandrescu,
                   Walter Brown,
                   Peter Dimov,
                   Jeff Garland,
                   Terry Golubiewski,
                   Daniel Krugler,
                   Anthony Williams.
*/

// The way overflow is managed for ratio_less is taken from llvm/libcxx/include/ratio

#ifndef BOOST_RATIO_RATIO_FWD_HPP
#define BOOST_RATIO_RATIO_FWD_HPP

#include <ratio>

namespace boost
{

//----------------------------------------------------------------------------//
//                                                                            //
//              20.6 Compile-time rational arithmetic [ratio]                 //
//                                                                            //
//----------------------------------------------------------------------------//

// ratio
using std::ratio;

// ratio arithmetic
using std::ratio_add;
using std::ratio_subtract;
using std::ratio_multiply;
using std::ratio_divide;

// ratio comparison
using std::ratio_equal;
using std::ratio_not_equal;
using std::ratio_less;
using std::ratio_less_equal;
using std::ratio_greater;
using std::ratio_greater_equal;

// convenience SI typedefs
using std::atto;
using std::femto;
using std::pico;
using std::nano;
using std::micro;
using std::milli;
using std::centi;
using std::deci;
using std::deca;
using std::hecto;
using std::kilo;
using std::mega;
using std::giga;
using std::tera;
using std::peta;
using std::exa;

}  // namespace boost

#endif  // BOOST_RATIO_RATIO_FWD_HPP