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/// \file
// Range v3 library
//
// Copyright Eric Niebler 2014-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_ALGORITHM_TRANSFORM_HPP
#define RANGES_V3_ALGORITHM_TRANSFORM_HPP
#include <utility>
#include <meta/meta.hpp>
#include <range/v3/range_fwd.hpp>
#include <range/v3/algorithm/result_types.hpp>
#include <range/v3/functional/identity.hpp>
#include <range/v3/functional/invoke.hpp>
#include <range/v3/iterator/concepts.hpp>
#include <range/v3/iterator/traits.hpp>
#include <range/v3/iterator/unreachable_sentinel.hpp>
#include <range/v3/range/access.hpp>
#include <range/v3/range/concepts.hpp>
#include <range/v3/range/dangling.hpp>
#include <range/v3/range/traits.hpp>
#include <range/v3/utility/static_const.hpp>
#include <range/v3/detail/prologue.hpp>
namespace ranges
{
/// \addtogroup group-algorithms
/// @{
template<typename I, typename O>
using unary_transform_result = detail::in_out_result<I, O>;
template<typename I1, typename I2, typename O>
using binary_transform_result = detail::in1_in2_out_result<I1, I2, O>;
RANGES_FUNC_BEGIN(transform)
// Single-range variant
/// \brief function template \c transform
template(typename I, typename S, typename O, typename F, typename P = identity)(
requires input_iterator<I> AND sentinel_for<S, I> AND
weakly_incrementable<O> AND copy_constructible<F> AND
indirectly_writable<O, indirect_result_t<F &, projected<I, P>>>)
constexpr unary_transform_result<I, O> //
RANGES_FUNC(transform)(I first, S last, O out, F fun, P proj = P{}) //
{
for(; first != last; ++first, ++out)
*out = invoke(fun, invoke(proj, *first));
return {first, out};
}
/// \overload
template(typename Rng, typename O, typename F, typename P = identity)(
requires input_range<Rng> AND weakly_incrementable<O> AND
copy_constructible<F> AND
indirectly_writable<O, indirect_result_t<F &, projected<iterator_t<Rng>, P>>>)
constexpr unary_transform_result<borrowed_iterator_t<Rng>, O> //
RANGES_FUNC(transform)(Rng && rng, O out, F fun, P proj = P{}) //
{
return (*this)(
begin(rng), end(rng), std::move(out), std::move(fun), std::move(proj));
}
// Double-range variant, 4-iterator version
/// \overload
template(typename I0,
typename S0,
typename I1,
typename S1,
typename O,
typename F,
typename P0 = identity,
typename P1 = identity)(
requires input_iterator<I0> AND sentinel_for<S0, I0> AND
input_iterator<I1> AND sentinel_for<S1, I1> AND
weakly_incrementable<O> AND copy_constructible<F> AND
indirectly_writable<
O,
indirect_result_t<F &, projected<I0, P0>, projected<I1, P1>>>)
constexpr binary_transform_result<I0, I1, O> //
RANGES_FUNC(transform)(I0 begin0,
S0 end0,
I1 begin1,
S1 end1,
O out,
F fun,
P0 proj0 = P0{},
P1 proj1 = P1{}) //
{
for(; begin0 != end0 && begin1 != end1; ++begin0, ++begin1, ++out)
*out = invoke(fun, invoke(proj0, *begin0), invoke(proj1, *begin1));
return {begin0, begin1, out};
}
/// \overload
template(typename Rng0,
typename Rng1,
typename O,
typename F,
typename P0 = identity,
typename P1 = identity)(
requires input_range<Rng0> AND input_range<Rng1> AND
weakly_incrementable<O> AND copy_constructible<F> AND
indirectly_writable<
O,
indirect_result_t<F &,
projected<iterator_t<Rng0>, P0>,
projected<iterator_t<Rng1>, P1>>>)
constexpr binary_transform_result<borrowed_iterator_t<Rng0>,
borrowed_iterator_t<Rng1>,
O> //
RANGES_FUNC(transform)(
Rng0 && rng0, Rng1 && rng1, O out, F fun, P0 proj0 = P0{}, P1 proj1 = P1{}) //
{
return (*this)(begin(rng0),
end(rng0),
begin(rng1),
end(rng1),
std::move(out),
std::move(fun),
std::move(proj0),
std::move(proj1));
}
// Double-range variant, 3-iterator version
/// \overload
template(typename I0,
typename S0,
typename I1,
typename O,
typename F,
typename P0 = identity,
typename P1 = identity)(
requires input_iterator<I0> AND sentinel_for<S0, I0> AND
input_iterator<I1> AND weakly_incrementable<O> AND
copy_constructible<F> AND
indirectly_writable<
O,
indirect_result_t<F &, projected<I0, P0>, projected<I1, P1>>>)
RANGES_DEPRECATED(
"Use the variant of ranges::transform that takes an upper bound "
"for both input ranges")
binary_transform_result<I0, I1, O> //
RANGES_FUNC(transform)(I0 begin0,
S0 end0,
I1 begin1,
O out,
F fun,
P0 proj0 = P0{},
P1 proj1 = P1{})
{
return (*this)(std::move(begin0),
std::move(end0),
std::move(begin1),
unreachable,
std::move(out),
std::move(fun),
std::move(proj0),
std::move(proj1));
}
/// \overload
template(typename Rng0,
typename I1Ref,
typename O,
typename F,
typename P0 = identity,
typename P1 = identity)(
requires input_range<Rng0> AND input_iterator<uncvref_t<I1Ref>> AND
weakly_incrementable<O> AND copy_constructible<F> AND
indirectly_writable<
O,
indirect_result_t<F &,
projected<iterator_t<Rng0>, P0>,
projected<uncvref_t<I1Ref>, P1>>>)
RANGES_DEPRECATED(
"Use the variant of ranges::transform that takes an upper bound "
"for both input ranges")
binary_transform_result<borrowed_iterator_t<Rng0>, uncvref_t<I1Ref>, O> //
RANGES_FUNC(transform)(Rng0 && rng0,
I1Ref && begin1,
O out,
F fun,
P0 proj0 = P0{},
P1 proj1 = P1{}) //
{
return (*this)(begin(rng0),
end(rng0),
static_cast<I1Ref &&>(begin1),
unreachable,
std::move(out),
std::move(fun),
std::move(proj0),
std::move(proj1));
}
RANGES_FUNC_END(transform)
namespace cpp20
{
using ranges::binary_transform_result;
using ranges::transform;
using ranges::unary_transform_result;
} // namespace cpp20
/// @}
} // namespace ranges
#include <range/v3/detail/epilogue.hpp>
#endif
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