operator +

[shuisheng]

Dear all,

I am wondering where the operator + should be defined. In the global
domain, or the class domain.

For example

class A
{
A operator + (const A& second) const;
}

or

A operator + (const A& first, const A& second);

And are they the same?

Thanks,

Shuisheng

[jpalecek]

shuisheng wrote:

I am wondering where the operator + should be defined. In the global
domain, or the class domain.

For example

class A
{
A operator + (const A& second) const;
}

or

A operator + (const A& first, const A& second);

And are they the same?

Hello,

The latter possibility may be better. The difference is that
if you had type B implicitly convertible to A, the second definition
would do for B+A, but the first no.

Jiri Palecek