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/// \file
// Range v3 library
//
// Copyright Eric Niebler 2013-present
//
// Use, modification and distribution is 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)
//
// Project home: https://github.com/ericniebler/range-v3
//
#ifndef RANGES_V3_UTILITY_TUPLE_ALGORITHM_HPP
#define RANGES_V3_UTILITY_TUPLE_ALGORITHM_HPP
#include <initializer_list>
#include <tuple>
#include <type_traits>
#include <utility>
#include <meta/meta.hpp>
#include <range/v3/range_fwd.hpp>
#include <range/v3/detail/adl_get.hpp>
#include <range/v3/functional/invoke.hpp>
#include <range/v3/utility/static_const.hpp>
#include <range/v3/detail/prologue.hpp>
namespace ranges
{
/// \addtogroup group-utility
/// @{
template<typename Tup>
using tuple_indices_t = meta::make_index_sequence<
std::tuple_size<typename std::remove_reference<Tup>::type>::value>;
struct tuple_apply_fn
{
// clang-format off
private:
template<typename Fun, typename Tup, std::size_t... Is>
static constexpr auto //
CPP_auto_fun(impl)(Fun &&fun, Tup &&tup, meta::index_sequence<Is...>)
(
return invoke(static_cast<Fun &&>(fun),
detail::adl_get<Is>(static_cast<Tup &&>(tup))...)
)
public:
template<typename Fun, typename Tup>
constexpr auto CPP_auto_fun(operator())(Fun &&fun, Tup &&tup)(const)
(
return tuple_apply_fn::impl(static_cast<Fun &&>(fun),
static_cast<Tup &&>(tup),
tuple_indices_t<Tup>{})
)
// clang-format on
};
/// \ingroup group-utility
/// \sa `tuple_apply_fn`
RANGES_INLINE_VARIABLE(tuple_apply_fn, tuple_apply)
struct tuple_transform_fn
{
// clang-format off
private:
template<typename Tup, typename Fun, std::size_t... Is>
static constexpr auto //
CPP_auto_fun(impl1)(Tup &&tup, Fun &fun, meta::index_sequence<Is...>)
(
return std::tuple<
decltype(fun(detail::adl_get<Is>(static_cast<Tup &&>(tup))))...>{
fun(detail::adl_get<Is>(static_cast<Tup &&>(
tup)))...}
)
template<typename Tup0, typename Tup1, typename Fun, std::size_t... Is>
static constexpr auto CPP_auto_fun(impl2)(Tup0 &&tup0, Tup1 &&tup1, Fun &fun,
meta::index_sequence<Is...>)
(
return std::tuple<
decltype(fun(detail::adl_get<Is>(static_cast<Tup0 &&>(tup0)),
detail::adl_get<Is>(static_cast<Tup1 &&>(tup1))))...>{
fun(detail::adl_get<Is>(static_cast<Tup0 &&>(tup0)),
detail::adl_get<Is>(static_cast<Tup1 &&>(tup1)))...}
)
public:
template<typename Tup, typename Fun>
constexpr auto CPP_auto_fun(operator())(Tup &&tup, Fun fun)(const)
(
return tuple_transform_fn::impl1(
static_cast<Tup &&>(tup), fun,
tuple_indices_t<Tup>{})
)
template<typename Tup0, typename Tup1, typename Fun>
constexpr auto CPP_auto_fun(operator())(Tup0 &&tup0, Tup1 &&tup1, Fun fun)(const)
(
return tuple_transform_fn::impl2(static_cast<Tup0 &&>(tup0),
static_cast<Tup1 &&>(tup1), fun,
tuple_indices_t<Tup0>{})
)
// clang-format on
};
/// \ingroup group-utility
/// \sa `tuple_transform_fn`
RANGES_INLINE_VARIABLE(tuple_transform_fn, tuple_transform)
struct tuple_foldl_fn
{
private:
template<typename Tup, typename Val, typename Fun>
static constexpr Val impl(Tup &&, Val val, Fun &)
{
return val;
}
// clang-format off
template<std::size_t I0, std::size_t... Is, typename Tup, typename Val,
typename Fun, typename Impl = tuple_foldl_fn>
static constexpr auto CPP_auto_fun(impl)(Tup &&tup, Val val, Fun &fun)
(
return Impl::template impl<Is...>(
static_cast<Tup &&>(tup),
fun(std::move(val), detail::adl_get<I0>(static_cast<Tup &&>(tup))),
fun)
)
template<typename Tup, typename Val, typename Fun, std::size_t... Is>
static constexpr auto CPP_auto_fun(impl2)(Tup &&tup, Val val, Fun &fun,
meta::index_sequence<Is...>)
(
return tuple_foldl_fn::impl<Is...>(static_cast<Tup &&>(tup),
std::move(val),
fun)
)
public:
template<typename Tup, typename Val, typename Fun>
constexpr auto CPP_auto_fun(operator())(Tup &&tup, Val val, Fun fun)(const)
(
return tuple_foldl_fn::impl2(static_cast<Tup &&>(tup),
std::move(val),
fun,
tuple_indices_t<Tup>{})
)
// clang-format on
};
/// \ingroup group-utility
/// \sa `tuple_foldl_fn`
RANGES_INLINE_VARIABLE(tuple_foldl_fn, tuple_foldl)
struct tuple_for_each_fn
{
private:
template<typename Tup, typename Fun, std::size_t... Is>
static constexpr void impl(Tup && tup, Fun & fun, meta::index_sequence<Is...>)
{
(void)std::initializer_list<int>{
((void)fun(detail::adl_get<Is>(static_cast<Tup &&>(tup))), 42)...};
}
public:
template<typename Tup, typename Fun>
constexpr Fun operator()(Tup && tup, Fun fun) const
{
return tuple_for_each_fn::impl(
static_cast<Tup &&>(tup), fun, tuple_indices_t<Tup>{}),
fun;
}
};
/// \ingroup group-utility
/// \sa `tuple_for_each_fn`
RANGES_INLINE_VARIABLE(tuple_for_each_fn, tuple_for_each)
struct make_tuple_fn
{
// clang-format off
template<typename... Ts>
constexpr auto CPP_auto_fun(operator())(Ts &&... ts)(const)
(
return std::make_tuple(static_cast<Ts &&>(ts)...)
)
// clang-format on
};
/// \ingroup group-utility
/// \sa `make_tuple_fn`
RANGES_INLINE_VARIABLE(make_tuple_fn, make_tuple)
/// @}
} // namespace ranges
#include <range/v3/detail/epilogue.hpp>
#endif
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