C++ ambiguous overload for ‘operator ’

Question

I\'v read several posts here about this kind of errors, but I wasn\'t able to solve this one... Has soon I define the operator int and the function f, fails to compile. I teste

Answer 1

You don't seem to have posted the code that actually causes the error. I guess it looks something like

Fraccao a;
Fraccao b = a + 4;
Fraccao c = 4 + a;

The problem is that your class allows implicit conversions both to and from int; so a + 4 could be either

int(a) + 4

or

a + Fraccao(4)

with no reason to choose one over the other. To resolve the ambiguity, you could either:

• make the conversion explicit, as above; or
• declare either the constructor or the conversion operator (or even both) explicit so that only one (or even neither) conversion can be done implicitly.