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std::complex::operators (unary)

复杂：：操作员+%28一元%29，操作员-%28一元%29

template< class T > complex operator+( const complex& val (1)​
template< class T > complex<T> operator-( const complex<T>& val (2)​

实现了复数一元算术运算符的类比。

1%29返回其参数的值。

2%29否定了这个论点

参数

val-the complex number argument

返回值

1%29一份论点的副本，complex<T>(val)

2%29否决了论点，complex<T>(-val.real(), -val.imag())

另见

operator+operator-operator*operator/performs complex number arithmetics on two complex values or a complex and a scalar (function template)

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