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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_VIEW_REPLACE_IF_HPP
#define RANGES_V3_VIEW_REPLACE_IF_HPP
#include <type_traits>
#include <utility>
#include <meta/meta.hpp>
#include <concepts/concepts.hpp>
#include <range/v3/range_fwd.hpp>
#include <range/v3/functional/bind_back.hpp>
#include <range/v3/functional/invoke.hpp>
#include <range/v3/utility/compressed_pair.hpp>
#include <range/v3/utility/semiregular_box.hpp>
#include <range/v3/utility/static_const.hpp>
#include <range/v3/view/all.hpp>
#include <range/v3/view/transform.hpp>
#include <range/v3/view/view.hpp>
#include <range/v3/detail/prologue.hpp>
namespace ranges
{
/// \cond
namespace detail
{
template<typename Pred, typename Val>
struct replacer_if_fn : compressed_pair<semiregular_box_t<Pred>, Val>
{
private:
using base_t = compressed_pair<semiregular_box_t<Pred>, Val>;
using base_t::first;
using base_t::second;
public:
replacer_if_fn() = default;
constexpr replacer_if_fn(Pred pred, Val new_value)
: base_t{std::move(pred), std::move(new_value)}
{}
template<typename I>
[[noreturn]] common_type_t<decay_t<unwrap_reference_t<Val const &>>,
iter_value_t<I>> &
operator()(copy_tag, I const &) const
{
RANGES_EXPECT(false);
}
template(typename I)(
requires (!invocable<Pred const &, iter_reference_t<I>>))
common_reference_t<unwrap_reference_t<Val const &>, iter_reference_t<I>> //
operator()(I const & i)
{
auto && x = *i;
if(invoke(first(), (decltype(x) &&)x)) //
return unwrap_reference(second());
return (decltype(x) &&)x;
}
template(typename I)(
requires invocable<Pred const &, iter_reference_t<I>>)
common_reference_t<unwrap_reference_t<Val const &>, iter_reference_t<I>> //
operator()(I const & i) const
{
auto && x = *i;
if(invoke(first(), (decltype(x) &&)x)) //
return unwrap_reference(second());
return (decltype(x) &&)x;
}
template(typename I)(
requires (!invocable<Pred const &, iter_rvalue_reference_t<I>>))
common_reference_t<
unwrap_reference_t<Val const &>, //
iter_rvalue_reference_t<I>> //
operator()(move_tag, I const & i)
{
auto && x = iter_move(i);
if(invoke(first(), (decltype(x) &&)x)) //
return unwrap_reference(second());
return (decltype(x) &&)x;
}
template(typename I)(
requires invocable<Pred const &, iter_rvalue_reference_t<I>>)
common_reference_t< //
unwrap_reference_t<Val const &>, //
iter_rvalue_reference_t<I>> //
operator()(move_tag, I const & i) const
{
auto && x = iter_move(i);
if(invoke(first(), (decltype(x) &&)x)) //
return unwrap_reference(second());
return (decltype(x) &&)x;
}
};
} // namespace detail
/// \endcond
/// \addtogroup group-views
/// @{
namespace views
{
struct replace_if_base_fn
{
template(typename Rng, typename Pred, typename Val)(
requires viewable_range<Rng> AND input_range<Rng> AND
indirect_unary_predicate<Pred, iterator_t<Rng>> AND
common_with<detail::decay_t<unwrap_reference_t<Val const &>>,
range_value_t<Rng>> AND
common_reference_with<unwrap_reference_t<Val const &>,
range_reference_t<Rng>> AND
common_reference_with<unwrap_reference_t<Val const &>,
range_rvalue_reference_t<Rng>>)
constexpr replace_if_view<all_t<Rng>, Pred, Val> //
operator()(Rng && rng, Pred pred, Val new_value) const
{
return {all(static_cast<Rng &&>(rng)),
{std::move(pred), std::move(new_value)}};
}
};
struct replace_if_fn : replace_if_base_fn
{
using replace_if_base_fn::operator();
template<typename Pred, typename Val>
constexpr auto operator()(Pred pred, Val new_value) const
{
return make_view_closure(bind_back(
replace_if_base_fn{}, std::move(pred), std::move(new_value)));
}
};
/// \relates replace_if_fn
/// \ingroup group-views
RANGES_INLINE_VARIABLE(replace_if_fn, replace_if)
} // namespace views
/// @}
} // namespace ranges
#include <range/v3/detail/epilogue.hpp>
#endif
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