maybe_clone.h

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#pragma once
 
#include "di/meta/operations.h"
#include "di/util/clone.h"
#include "di/util/move.h"
 
namespace di::util {
namespace detail {
    struct MaybeCloneFunction {
        template<typename T>
        requires((concepts::RValueReference<T> && concepts::MoveConstructible<T>) || concepts::Clonable<T>)
        constexpr auto operator()(T&& value) const {
            if constexpr (concepts::RValueReference<T> && concepts::MoveConstructible<T>) {
                return util::forward<T>(value);
            } else {
                return util::clone(value);
            }
        }
    };
}
 
constexpr inline auto maybe_clone = detail::MaybeCloneFunction {};
}
 
namespace di {
using util::maybe_clone;
}