C++Talk.NET

Nan Li · Guest

Hello, all,
I have the following code. I don't know what 'A a();' means in the
main function, though it can be compiled.

Thanks a lot,
Nan

class A
{
public:
int i;
explicit A(int i) {}
};

int main()
{
A b(1);
b.i = 2;

// A a(); //compile OK. But what does this mean?
// a.i = 1; //compile failure
}

mlimber · Guest

Nan Li wrote:

Karl Heinz Buchegger · Guest

Nan Li wrote:

mlimber · Guest

Karl Heinz Buchegger wrote:

Karl Heinz Buchegger · Guest

mlimber wrote:

Nan Li · Guest

Thank you for your quick replies. I rewrote the code as below

#include <iostream>
class A
{
public:
int i;
explicit A(int i) {}
};

int main()
{
A b(1);
b.i = 2;

A a();
a();
}

A a(){
A a(1);
std::cout << "here" << std::endl;
return a;
}

results:
[nan@xxx test]$ g++ test1.cpp && ./a.out
here

If I don't have 'A a()' declared in the main function , g++ gives
error `A a()' used prior to declaration' , as expected.

Thanks again
Nan