使用一元加运算符 [英] Use of unary plus operator

问题描述

我听说它用作重载运算符+，例如

I've heard it is used as overloaded operator+ for example

class MyClass
{
    int x;
public:
    MyClass(int num):x(num){}
    MyClass operator+(const MyClass &rhs)
    {
        return rhs.x + x;
    }
};

int main()
{
    MyClass x(100);
    MyClass y(100);
    MyClass z = x + y;
}

这真的是一元加运算符的使用，操作符？

Is this really the use of unary plus operator or is it really a binary + operator?

推荐答案

这不是重载和使用一元+ ..你需要做一个自由功能或使成员function take 0 arguments

This is not overloading and using unary + .. You need to either make that a free function or make the member function take 0 arguments

class MyClass
{
    int x;
public:
    MyClass(int num):x(num){}
    MyClass operator+() const
    {
        return *this;
    }
};

int main() {
  MyClass x = 42;
  + x;
}

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