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// Range v3 library
//
// Copyright 2019 Christopher Di Bella
//
// 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_STARTS_WITH_HPP
#define RANGES_V3_ALGORITHM_STARTS_WITH_HPP
#include <utility>
#include <range/v3/range_fwd.hpp>
#include <range/v3/algorithm/equal.hpp>
#include <range/v3/algorithm/mismatch.hpp>
#include <range/v3/functional/comparisons.hpp>
#include <range/v3/functional/identity.hpp>
#include <range/v3/iterator/concepts.hpp>
#include <range/v3/iterator/operations.hpp>
#include <range/v3/range/access.hpp>
#include <range/v3/range/concepts.hpp>
#include <range/v3/range/traits.hpp>
#include <range/v3/utility/static_const.hpp>
#include <range/v3/detail/disable_warnings.hpp>
namespace ranges
{
/// \addtogroup group-algorithms
/// @{
// template<typename I1, typename I2>
// struct starts_with_result : detail::in1_in2_result<I1, I2>
// {
// bool result;
// };
RANGES_FUNC_BEGIN(starts_with)
/// \brief function template \c starts_with
template<typename I1,
typename S1,
typename I2,
typename S2,
typename Comp = equal_to,
typename Proj1 = identity,
typename Proj2 = identity>
constexpr auto RANGES_FUNC(starts_with)(I1 first1,
S1 last1,
I2 first2,
S2 last2,
Comp comp = {},
Proj1 proj1 = {},
Proj2 proj2 = {}) //
->CPP_ret(bool)( //
requires input_iterator<I1> && sentinel_for<S1, I1> &&
input_iterator<I2> && sentinel_for<S2, I2> &&
indirectly_comparable<I1, I2, Comp, Proj1, Proj2>)
{
return mismatch(std::move(first1),
std::move(last1),
std::move(first2),
last2,
std::move(comp),
std::move(proj1),
std::move(proj2))
.in2 == last2;
}
/// \overload
template<typename R1,
typename R2,
typename Comp = equal_to,
typename Proj1 = identity,
typename Proj2 = identity>
constexpr auto RANGES_FUNC(starts_with)(
R1 && r1, R2 && r2, Comp comp = {}, Proj1 proj1 = {}, Proj2 proj2 = {}) //
->CPP_ret(bool)( //
requires input_range<R1> && input_range<R2> &&
indirectly_comparable<iterator_t<R1>, iterator_t<R2>, Comp, Proj1, Proj2>)
{
return (*this)( //
begin(r1),
end(r1),
begin(r2),
end(r2),
std::move(comp),
std::move(proj1),
std::move(proj2));
}
RANGES_FUNC_END(starts_with)
/// @}
} // namespace ranges
#include <range/v3/detail/reenable_warnings.hpp>
#endif // RANGES_V3_ALGORITHM_STARTS_WITH_HPP
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