c2676-二进制'++'未定义此运算符 [英] c2676 - binary '++' does not define this operator
问题描述
我无法编译以下代码,但是我可以在Visual Studio下使用另一台笔记本电脑对其进行编译,如果设置不同,我也不是没有.
I'm not able to compile the below code, but i'm able to compile it under visual studio with another laptop, I don't no if there are a different configuration that shout be set.
#include<iostream>
using namespace std;
class Unary {
private:
int x, y;
public:
Unary(int i = 0, int j = 0) {
x = i;
y = j;
}
void show()
{
cout << x << " " << y << endl;
}
void operator++()
{
x++;
y++;
}
};
int main() {
Unary v(10, 20);
v++;
v.show();
}
,并显示以下错误:
Error C2676: binary '++': 'Unary' does not define this operator or a conversion to a type acceptable to the predefined operator
推荐答案
运算符++
实际上有两种含义,具体取决于它是用作前缀还是用作后缀运算符.当以一种或另一种方式使用C ++时,期望在您的类中定义哪个函数的约定如下:
Operator ++
actually has two meanings, depending on whether it is used as prefix or as postfix operator. The convention of which function C++ expects to be defined in your class when used in the one way or in the other is as follows:
class Unary {
public:
Unary& operator++ (); // prefix ++: no parameter, returns a reference
Unary operator++ (int); // postfix ++: dummy parameter, returns a value
};
您的函数void operator++()
不满足此约定,这就是错误出现的原因.
Your function void operator++()
does not fulfil this convention, that's why the error appears.
实现可能如下所示:
Unary Unary::operator++(int)
{
x++;
y++;
return *this;
}
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