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#pragma once
template <class T, T v>
struct integral_constant {
constexpr T operator()() const { return v; }
constexpr operator T() const { return v; }
};
template <class T, class U>
struct is_same : integral_constant<bool, false> {};
template <class T>
struct is_same<T, T> : integral_constant<bool, true> {};
template <typename T>
struct is_unsigned : integral_constant<bool, (T{0} < static_cast<T>(-1))> {};
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