variadic.hpp

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/*
 *  variadic.hpp
 *
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 *
 *  THIS SOURCE FILE IS PROVIDED BY THE CONTRIBUTORS "AS
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 *  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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 *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 *  SOURCE FILE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 
#pragma once
 
#include <neolib/neolib.hpp>
#include <type_traits>
 
namespace neolib
{
    namespace variadic
    {
        template <typename...>
        struct index;
 
        // found it
        template <typename T, typename... R>
        struct index<T, T, R...> : std::integral_constant<size_t, 0u> {};
 
        // still looking
        template <typename T, typename F, typename... R>
        struct index<T, F, R...> : std::integral_constant<size_t, 1u + index<T, R...>::value> {};
 
        template <typename T, typename... R>
        constexpr size_t index_v = index<T, R...>::value;
 
        template <typename T, typename... R>
        constexpr size_t no_reference_index_v = index<std::remove_reference_t<T>, R...>::value;
    }
}