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template <class _Ty, _Ty _Val> //----???
struct integral_constant {
static constexpr _Ty value = _Val;
using value_type = _Ty;
using type = integral_constant;
constexpr operator value_type() const noexcept {
return value;
}
_NODISCARD constexpr value_type operator()() const noexcept {
return value;
}
};
template<typename T , int MaxLen>
template <class _Ty, _Ty _Val>