get_in_place.h

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#pragma once
 
#include "di/function/tag_invoke.h"
#include "di/meta/constexpr.h"
#include "di/types/in_place_type.h"
#include "di/types/size_t.h"
 
namespace di::util {
struct GetInPlaceFunction {
    template<typename T, types::size_t index>
    constexpr auto operator()(Constexpr<index> place_holder, T&& tuple) const
        -> meta::TagInvokeResult<GetInPlaceFunction, Constexpr<index>, T> {
        return function::tag_invoke(*this, place_holder, util::forward<T>(tuple));
    }
 
    template<typename T, typename Type>
    constexpr auto operator()(types::InPlaceType<Type> place_holder, T&& tuple) const
        -> meta::TagInvokeResult<GetInPlaceFunction, types::InPlaceType<Type>, T> {
        return function::tag_invoke(*this, place_holder, util::forward<T>(tuple));
    }
};
 
constexpr inline auto get_in_place = GetInPlaceFunction {};
}
 
namespace di {
using util::get_in_place;
}