Constructors

[jvqpDjzh]

//Hello! I was studying a bit of overloading with our tutorials and I've just fronted a thing that I don't remember anymore well...

//Here is the part where my doubts came:

// overloading operators example
#include <iostream>
using namespace std;

class CVector {
  public:
    int x,y;

    CVector () {};//Why can we put here ';'? 
//but the constructor, which is a function, should have no the final ';', right ?
//what am I forgetting?

    CVector (int a,int b) : x(a), y(b) {}
    CVector operator + (const CVector&);
};

if you want to see all the code: http://www.cplusplus.com/doc/tutorial/templates/

[mutexe]

No, because that's not just the definition of the ctor, that's also the implementation as well.

edit:
it's the equivalent of having the definition in the header:

CVector(); // <--- yes, you do need the semi-colon now. 

and the implementation in the .cpp file:

CVector::CVector()
{}      // <-- no semi-colon here, just like any other function impl. 

also remember that ";" is just an empty statement, so is valid to put it almost anywhere. eg, this compiles just fine:

int main()
{
	;
	;
	;
	;
	;
	;

	return 0;
}

;
;
;

in other words, i think it's just a typo in your tutorial.

[jvqpDjzh]

Ok, thank you! I have never heard that the ';' was an empty statement and that we could put it almost everywhere.

[jvqpDjzh]

But what do you really mean by "empty statement"? We can use it almost everywhere but, for example, in certain cases it's mandatory to use it (classes, structs, arrays, enums,...)

[AbstractionAnon]

More correctly, ; is a statement terminator. How it's used depends on the type of statement.

A ; is used to terminate declarative statements (structs, classes, enums) as you mentioned.

In the case of executable statements, by itself it creates a null statement. A null statement can have meaning in certain situations such as:

 
    if (true)
        ;  // terminates the true side of the if 

[jvqpDjzh]

ok, thank you!