The problem of == in vc ++, waiting online

xjhs1984

If I define class A, I define two objects as follows:
A a, b;
if (a == b) {
}
Is it OK to write code like this?
Is it wrong to compile a == b here?
why?

zm123456

Overloaded operator

紫焰狼狼

It will go wrong, if you want to use it like this, you need to define the "==" operator for your class.

mowenjx

Overloaded == operator

bool A :: operator == (const A&ins)

jerryzhh

a, b are the variables of the class, there is no comparison function in the class, you need to write an overloaded function comparison yourself. Just like a = b, call the Cobb function. Just like if CArray <int, int> m_IDArr is defined in class A, then calling a = b will cause an error, because m_IDArr has no test function, so you must define the test function yourself.

xjhs1984

If I overload =, but not overload ==, I
A a, b;
if (a == b) {
}

Can this be written?

xjhs1984

If so, why?

zm123456

= Not ==

fangjiehong

The language foundation is so poor, I have got so many triangles

Does mfc really need language support ^-^

xjhs1984

The 2 masters upstairs have tried overloading = not overloading ==, is it definitely not working?