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/*!
@file
Adapts `std::ratio` for use with Hana.
@copyright Louis Dionne 2013-2017
Distributed under the Boost Software License, Version 1.0.
(See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
*/
#ifndef BOOST_HANA_EXT_STD_RATIO_HPP
#define BOOST_HANA_EXT_STD_RATIO_HPP
#include <boost/hana/bool.hpp>
#include <boost/hana/concept/integral_constant.hpp>
#include <boost/hana/config.hpp>
#include <boost/hana/core/when.hpp>
#include <boost/hana/fwd/core/to.hpp>
#include <boost/hana/fwd/core/tag_of.hpp>
#include <boost/hana/fwd/div.hpp>
#include <boost/hana/fwd/equal.hpp>
#include <boost/hana/fwd/less.hpp>
#include <boost/hana/fwd/minus.hpp>
#include <boost/hana/fwd/mod.hpp>
#include <boost/hana/fwd/mult.hpp>
#include <boost/hana/fwd/one.hpp>
#include <boost/hana/fwd/plus.hpp>
#include <boost/hana/fwd/zero.hpp>
#include <cstdint>
#include <ratio>
#include <type_traits>
#ifdef BOOST_HANA_DOXYGEN_INVOKED
namespace std {
//! @ingroup group-ext-std
//! Adaptation of `std::ratio` for Hana.
//!
//!
//! Modeled concepts
//! ----------------
//! 1. `Comparable`\n
//! `std::ratio`s are compared for equality using `std::ratio_equal`.
//! @include example/ext/std/ratio/comparable.cpp
//!
//! 2. `Orderable`\n
//! `std::ratio`s are ordered using `std::ratio_less`.
//! @include example/ext/std/ratio/orderable.cpp
//!
//! 3. `Monoid`, `Group`, `Ring`, and `EuclideanRing`\n
//! `std::ratio`s are added, subtracted, multiplied and divided using
//! `std::ratio_add`, `std::ratio_subtract`, `std::ratio_multiply` and
//! `std::ratio_divide`, respectively. Furthermore, the neutral element
//! for the additive operation is `std::ratio<0, 1>{}`, and the neutral
//! element for the multiplicative operation is `std::ratio<1, 1>{}`.
//! @include example/ext/std/ratio/arithmetic.cpp
template <std::intmax_t Num, std::intmax_t Denom>
class ratio { };
}
#endif
BOOST_HANA_NAMESPACE_BEGIN
namespace ext { namespace std { struct ratio_tag; }}
template <std::intmax_t num, std::intmax_t den>
struct tag_of<std::ratio<num, den>> {
using type = ext::std::ratio_tag;
};
//////////////////////////////////////////////////////////////////////////
// Conversion from IntegralConstants
//////////////////////////////////////////////////////////////////////////
template <typename C>
struct to_impl<ext::std::ratio_tag, C, when<
hana::IntegralConstant<C>::value
>> {
template <typename N>
static constexpr auto apply(N const&) {
return std::ratio<N::value>{};
}
};
//////////////////////////////////////////////////////////////////////////
// Comparable
//////////////////////////////////////////////////////////////////////////
template <>
struct equal_impl<ext::std::ratio_tag, ext::std::ratio_tag> {
template <typename R1, typename R2>
static constexpr auto apply(R1 const&, R2 const&)
{ return hana::bool_c<std::ratio_equal<R1, R2>::value>; }
};
//////////////////////////////////////////////////////////////////////////
// Orderable
//////////////////////////////////////////////////////////////////////////
template <>
struct less_impl<ext::std::ratio_tag, ext::std::ratio_tag> {
template <typename R1, typename R2>
static constexpr auto apply(R1 const&, R2 const&)
{ return hana::bool_c<std::ratio_less<R1, R2>::value>; }
};
//////////////////////////////////////////////////////////////////////////
// Monoid
//////////////////////////////////////////////////////////////////////////
template <>
struct plus_impl<ext::std::ratio_tag, ext::std::ratio_tag> {
template <typename R1, typename R2>
static constexpr std::ratio_add<R1, R2> apply(R1 const&, R2 const&)
{ return {}; }
};
template <>
struct zero_impl<ext::std::ratio_tag> {
static constexpr std::ratio<0> apply()
{ return {}; }
};
//////////////////////////////////////////////////////////////////////////
// Group
//////////////////////////////////////////////////////////////////////////
template <>
struct minus_impl<ext::std::ratio_tag, ext::std::ratio_tag> {
template <typename R1, typename R2>
static constexpr std::ratio_subtract<R1, R2> apply(R1 const&, R2 const&)
{ return {}; }
};
//////////////////////////////////////////////////////////////////////////
// Ring
//////////////////////////////////////////////////////////////////////////
template <>
struct mult_impl<ext::std::ratio_tag, ext::std::ratio_tag> {
template <typename R1, typename R2>
static constexpr std::ratio_multiply<R1, R2> apply(R1 const&, R2 const&)
{ return {}; }
};
template <>
struct one_impl<ext::std::ratio_tag> {
static constexpr std::ratio<1> apply()
{ return {}; }
};
//////////////////////////////////////////////////////////////////////////
// EuclideanRing
//////////////////////////////////////////////////////////////////////////
template <>
struct div_impl<ext::std::ratio_tag, ext::std::ratio_tag> {
template <typename R1, typename R2>
static constexpr std::ratio_divide<R1, R2> apply(R1 const&, R2 const&)
{ return {}; }
};
template <>
struct mod_impl<ext::std::ratio_tag, ext::std::ratio_tag> {
template <typename R1, typename R2>
static constexpr std::ratio<0> apply(R1 const&, R2 const&)
{ return {}; }
};
BOOST_HANA_NAMESPACE_END
#endif // !BOOST_HANA_EXT_STD_RATIO_HPP
|
