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#pragma once
namespace saw {
template <class T, class... TL> struct parameter_pack_index;
template <class T, class... TL> struct parameter_pack_index<T, T, TL...> {
static constexpr size_t value = 0u;
};
template <class T, class TL0, class... TL>
struct parameter_pack_index<T, TL0, TL...> {
static constexpr size_t value =
1u + parameter_pack_index<T, TL...>::value;
};
}
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