运算符的重载:确定MSVS但在g ++中失败

Question

我有在Visual Studio 2010中无错误编译的代码.但是g ++会出错

CComplex.cpp: In member function 'Complex Complex::operator+(Complex&)':
CComplex.cpp:22: error: no matching function for call to 'Complex::Complex(Complex)'
CComplex.cpp:15: note: candidates are: Complex::Complex(Complex&)
make: *** [CComplex.o] Error 1

请告诉我我的代码有什么问题.

Complex.h

class Complex
{
public:
  Complex();
  Complex(double _Re, double _Im);
  Complex(Complex& c);
  Complex operator+(Complex& num);
  inline double& fRe(void){return Re;}
  inline double& fIm(void){return Im;}
protected:
  double Re;
  double Im;
}

Complex.cpp

Complex::Complex(){
    Re = 0.0;
    Im = 0.0;
}
Complex::Complex(double re, double im){
    Re = re;
    Im = im;
}
Complex::Complex(Complex& complex){
    *this = complex;
}
Complex Complex::operator+(Complex& num){
    return Complex(Re + num.fRe(), Im + num.fIm());
};

Answer 1

Complex Complex::operator+(Complex& num){
    return Complex(Re + num.fRe(), Im + num.fIm());
};

作为回复,为临时对象调用复制c-tor,不能绑定到lvalue-reference.使用

Complex(const Complex& c);

并且operator +也用于

Complex operator + (const Complex& c)

要么

Complex operator + (Complex c)

对于第一个案例函数fRe并且fIm应该是常量函数,或者您应该对传递的对象进行显式复制.

它可以在MSVC中编译而不是用g ++编译,因为MSVC在执行返回值优化时错误地不检查是否存在可接受的复制构造函数.