uninitialized_default_construct_n.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"
#include "di/meta/trivial.h"
#include "di/util/addressof.h"
#include "di/util/default_construct_at.h"
 
namespace di::container {
namespace detail {
    struct UninitializedDefaultConstructNFunction {
        template<concepts::UninitForwardIterator Out>
        requires(concepts::DefaultInitializable<meta::IteratorValue<Out>>)
        constexpr auto operator()(Out out, meta::IteratorSSizeType<Out> n) const -> Out {
            if constexpr (concepts::TriviallyDefaultConstructible<meta::IteratorValue<Out>>) {
                return container::next(out, n);
            }
 
            for (; n > 0; --n, ++out) {
                util::default_construct_at(util::addressof(*out));
            }
            return out;
        }
    };
}
 
constexpr inline auto uninitialized_default_construct_n = detail::UninitializedDefaultConstructNFunction {};
}
 
namespace di {
using container::uninitialized_default_construct_n;
}