replace_if.h

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#pragma once
 
#include "di/container/concepts/prelude.h"
#include "di/container/iterator/prelude.h"
#include "di/container/meta/prelude.h"
 
namespace di::container {
namespace detail {
    struct ReplaceIfFunction {
        template<concepts::InputIterator It, concepts::SentinelFor<It> Sent, typename U,
                 typename Proj = function::Identity, concepts::IndirectUnaryPredicate<meta::Projected<It, Proj>> Pred>
        requires(concepts::IndirectlyWritable<It, U const&>)
        constexpr auto operator()(It first, Sent last, Pred pred, U const& new_value, Proj proj = {}) const -> It {
            for (; first != last; ++first) {
                if (function::invoke(pred, function::invoke(proj, *first))) {
                    *first = new_value;
                }
            }
            return first;
        }
 
        template<concepts::InputContainer Con, typename U, typename Proj = function::Identity,
                 concepts::IndirectUnaryPredicate<meta::Projected<meta::ContainerIterator<Con>, Proj>> Pred>
        requires(concepts::IndirectlyWritable<meta::ContainerIterator<Con>, U const&>)
        constexpr auto operator()(Con&& container, Pred pred, U const& new_value, Proj proj = {}) const
            -> meta::BorrowedIterator<Con> {
            return (*this)(container::begin(container), container::end(container), util::ref(pred), new_value, proj);
        }
    };
}
 
constexpr inline auto replace_if = detail::ReplaceIfFunction {};
}
 
namespace di {
using container::replace_if;
}