code. compile. run. debug. share.
//forward declare f
void f();
struct X
{
friend void f()
{
// friend functions can be defined in the class
// this does NOT serve as a declaration, even though this is already a definition
// to use this function, another declaration is REQUIRED
}
friend X operator+(const X & x1, const X & x2)
{
// this stuff serves as declaration somehow
return {x1.v + x2.v};
}
void foo()
{
f(); // ERROR: no declaration for f
X tmp = X {1} + X {2}; // CORRECT
}
int v;
};
int main()
{
return 0;
}
Compiling Program...
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