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#pragma clang system_header
namespace std {
template<class T, T v>
struct integral_constant {
static constexpr T value = v;
typedef T value_type;
typedef integral_constant type;
constexpr operator value_type() const noexcept { return value; }
};
template <bool B>
using bool_constant = integral_constant<bool, B>;
using true_type = bool_constant<true>;
using false_type = bool_constant<false>;
template<class T>
struct is_error_code_enum : false_type {};
template<class T>
void swap(T &a, T &b);
}
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