template<class T> complex<T> pow (const complex<T>& x, int y);template<class T> complex<T> pow (const complex<T>& x, const complex<T>& y);template<class T> complex<T> pow (const complex<T>& x, const T& y);template<class T> complex<T> pow (const T& x, const complex<T>& y);
template<class T> complex<T> pow (const complex<T>& x, const complex<T>& y);template<class T> complex<T> pow (const complex<T>& x, const T& y);template<class T> complex<T> pow (const T& x, const complex<T>& y);
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<cmath>
中定义)。pow(0,0)
的返回值是实现定义的。