/// \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_ACTION_ERASE_HPP
#define RANGES_V3_ACTION_ERASE_HPP

#include <utility>

#include <range/v3/range_fwd.hpp>

#include <range/v3/action/insert.hpp>
#include <range/v3/utility/static_const.hpp>

namespace ranges
{
    /// \cond
    namespace adl_erase_detail
    {
        template<typename Cont, typename I, typename S>
        auto erase(Cont && cont, I first, S last)                            //
            -> CPP_ret(decltype(unwrap_reference(cont).erase(first, last)))( //
                requires lvalue_container_like<Cont> && forward_iterator<I> &&
                    sentinel_for<S, I>)
        {
            return unwrap_reference(cont).erase(first, last);
        }

        struct erase_fn
        {
            template<typename Rng, typename I, typename S>
            auto operator()(Rng && rng, I first, S last) const
                -> CPP_ret(decltype(erase((Rng &&) rng, first, last)))( //
                    requires range<Rng> && forward_iterator<I> && sentinel_for<S, I>)
            {
                return erase(static_cast<Rng &&>(rng), first, last);
            }
        };
    } // namespace adl_erase_detail
    /// \endcond

    /// \ingroup group-actions
    RANGES_INLINE_VARIABLE(adl_erase_detail::erase_fn, erase)

    namespace actions
    {
        using ranges::erase;
    }

    /// \addtogroup group-range
    /// @{
    // clang-format off
    CPP_def
    (
        template(typename Rng, typename I, typename S)
        concept erasable_range,
            requires (Rng &&rng, I first, S last)
            (
                ranges::erase(static_cast<Rng &&>(rng), first, last)
            ) &&
            range<Rng>
    );
    // clang-format on
    /// @}
} // namespace ranges

#endif