/usr/include/boost/hana/pair.hpp is in libboost1.65-dev 1.65.1+dfsg-0ubuntu5.
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@file
Defines `boost::hana::pair`.
@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_PAIR_HPP
#define BOOST_HANA_PAIR_HPP
#include <boost/hana/fwd/pair.hpp>
#include <boost/hana/config.hpp>
#include <boost/hana/detail/decay.hpp>
#include <boost/hana/detail/ebo.hpp>
#include <boost/hana/detail/intrinsics.hpp>
#include <boost/hana/detail/operators/adl.hpp>
#include <boost/hana/detail/operators/comparable.hpp>
#include <boost/hana/detail/operators/orderable.hpp>
#include <boost/hana/fwd/core/make.hpp>
#include <boost/hana/fwd/first.hpp>
#include <boost/hana/fwd/second.hpp>
#include <type_traits>
#include <utility>
BOOST_HANA_NAMESPACE_BEGIN
namespace detail {
template <int> struct pix; // pair index
}
//////////////////////////////////////////////////////////////////////////
// pair
//////////////////////////////////////////////////////////////////////////
//! @cond
template <typename First, typename Second>
struct pair : detail::operators::adl<pair<First, Second>>
, private detail::ebo<detail::pix<0>, First>
, private detail::ebo<detail::pix<1>, Second>
{
// Default constructor
template <typename ...dummy, typename = typename std::enable_if<
BOOST_HANA_TT_IS_CONSTRUCTIBLE(First, dummy...) &&
BOOST_HANA_TT_IS_CONSTRUCTIBLE(Second, dummy...)
>::type>
constexpr pair()
: detail::ebo<detail::pix<0>, First>()
, detail::ebo<detail::pix<1>, Second>()
{ }
// Variadic constructors
template <typename ...dummy, typename = typename std::enable_if<
BOOST_HANA_TT_IS_CONSTRUCTIBLE(First, First const&, dummy...) &&
BOOST_HANA_TT_IS_CONSTRUCTIBLE(Second, Second const&, dummy...)
>::type>
constexpr pair(First const& fst, Second const& snd)
: detail::ebo<detail::pix<0>, First>(fst)
, detail::ebo<detail::pix<1>, Second>(snd)
{ }
template <typename T, typename U, typename = typename std::enable_if<
BOOST_HANA_TT_IS_CONVERTIBLE(T&&, First) &&
BOOST_HANA_TT_IS_CONVERTIBLE(U&&, Second)
>::type>
constexpr pair(T&& t, U&& u)
: detail::ebo<detail::pix<0>, First>(static_cast<T&&>(t))
, detail::ebo<detail::pix<1>, Second>(static_cast<U&&>(u))
{ }
// Possibly converting copy and move constructors
template <typename T, typename U, typename = typename std::enable_if<
BOOST_HANA_TT_IS_CONSTRUCTIBLE(First, T const&) &&
BOOST_HANA_TT_IS_CONSTRUCTIBLE(Second, U const&) &&
BOOST_HANA_TT_IS_CONVERTIBLE(T const&, First) &&
BOOST_HANA_TT_IS_CONVERTIBLE(U const&, Second)
>::type>
constexpr pair(pair<T, U> const& other)
: detail::ebo<detail::pix<0>, First>(hana::first(other))
, detail::ebo<detail::pix<1>, Second>(hana::second(other))
{ }
template <typename T, typename U, typename = typename std::enable_if<
BOOST_HANA_TT_IS_CONSTRUCTIBLE(First, T&&) &&
BOOST_HANA_TT_IS_CONSTRUCTIBLE(Second, U&&) &&
BOOST_HANA_TT_IS_CONVERTIBLE(T&&, First) &&
BOOST_HANA_TT_IS_CONVERTIBLE(U&&, Second)
>::type>
constexpr pair(pair<T, U>&& other)
: detail::ebo<detail::pix<0>, First>(hana::first(static_cast<pair<T, U>&&>(other)))
, detail::ebo<detail::pix<1>, Second>(hana::second(static_cast<pair<T, U>&&>(other)))
{ }
// Copy and move assignment
template <typename T, typename U, typename = typename std::enable_if<
BOOST_HANA_TT_IS_ASSIGNABLE(First&, T const&) &&
BOOST_HANA_TT_IS_ASSIGNABLE(Second&, U const&)
>::type>
constexpr pair& operator=(pair<T, U> const& other) {
hana::first(*this) = hana::first(other);
hana::second(*this) = hana::second(other);
return *this;
}
template <typename T, typename U, typename = typename std::enable_if<
BOOST_HANA_TT_IS_ASSIGNABLE(First&, T&&) &&
BOOST_HANA_TT_IS_ASSIGNABLE(Second&, U&&)
>::type>
constexpr pair& operator=(pair<T, U>&& other) {
hana::first(*this) = hana::first(static_cast<pair<T, U>&&>(other));
hana::second(*this) = hana::second(static_cast<pair<T, U>&&>(other));
return *this;
}
// Prevent the compiler from defining the default copy and move
// constructors, which interfere with the SFINAE above.
~pair() = default;
friend struct first_impl<pair_tag>;
friend struct second_impl<pair_tag>;
template <typename F, typename S> friend struct pair;
};
//! @endcond
template <typename First, typename Second>
struct tag_of<pair<First, Second>> {
using type = pair_tag;
};
//////////////////////////////////////////////////////////////////////////
// Operators
//////////////////////////////////////////////////////////////////////////
namespace detail {
template <>
struct comparable_operators<pair_tag> {
static constexpr bool value = true;
};
template <>
struct orderable_operators<pair_tag> {
static constexpr bool value = true;
};
}
//////////////////////////////////////////////////////////////////////////
// Product
//////////////////////////////////////////////////////////////////////////
template <>
struct make_impl<pair_tag> {
template <typename F, typename S>
static constexpr pair<
typename detail::decay<F>::type,
typename detail::decay<S>::type
> apply(F&& f, S&& s) {
return {static_cast<F&&>(f), static_cast<S&&>(s)};
}
};
template <>
struct first_impl<pair_tag> {
template <typename First, typename Second>
static constexpr decltype(auto) apply(hana::pair<First, Second>& p) {
return detail::ebo_get<detail::pix<0>>(
static_cast<detail::ebo<detail::pix<0>, First>&>(p)
);
}
template <typename First, typename Second>
static constexpr decltype(auto) apply(hana::pair<First, Second> const& p) {
return detail::ebo_get<detail::pix<0>>(
static_cast<detail::ebo<detail::pix<0>, First> const&>(p)
);
}
template <typename First, typename Second>
static constexpr decltype(auto) apply(hana::pair<First, Second>&& p) {
return detail::ebo_get<detail::pix<0>>(
static_cast<detail::ebo<detail::pix<0>, First>&&>(p)
);
}
};
template <>
struct second_impl<pair_tag> {
template <typename First, typename Second>
static constexpr decltype(auto) apply(hana::pair<First, Second>& p) {
return detail::ebo_get<detail::pix<1>>(
static_cast<detail::ebo<detail::pix<1>, Second>&>(p)
);
}
template <typename First, typename Second>
static constexpr decltype(auto) apply(hana::pair<First, Second> const& p) {
return detail::ebo_get<detail::pix<1>>(
static_cast<detail::ebo<detail::pix<1>, Second> const&>(p)
);
}
template <typename First, typename Second>
static constexpr decltype(auto) apply(hana::pair<First, Second>&& p) {
return detail::ebo_get<detail::pix<1>>(
static_cast<detail::ebo<detail::pix<1>, Second>&&>(p)
);
}
};
BOOST_HANA_NAMESPACE_END
#endif // !BOOST_HANA_PAIR_HPP
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