single.h

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#pragma once
 
#include "di/container/view/single_view.h"
#include "di/function/tag_invoke.h"
#include "di/meta/util.h"
#include "di/util/forward.h"
 
namespace di::container::view {
namespace detail {
    struct SingleFunction {
        template<typename T>
        constexpr auto operator()(T&& value) const -> meta::TagInvokeResult<SingleFunction, T> {
            return function::tag_invoke(*this, util::forward<T>(value));
        }
 
        template<typename T>
        constexpr auto operator()(T&& value) const {
            return SingleView<meta::Decay<T>>(util::forward<T>(value));
        }
    };
}
 
constexpr inline auto single = detail::SingleFunction {};
}
 
namespace di {
using view::single;
}