On Sat, Jul 14, 2012 at 07:04:07AM -0700, julien2412 wrote:
> Hello,
>
> Keeping on slowly reading Bjarne Stroustrup's C++ book, I read that for =
> operator functions, we must delete/free the members before = assignment
> (which must copy).
Yes. Additionally, we must guard against self-assignment, because it
would lead to use of already deleted object. So, the canonical way to
write operator= is:
Foo& operator=(Foo const& other)
{
if (this != &other)
{
// copy
}
return *this;
}
Or, if the class implements swap (and has accessible copy constructor,
which it should always have when it has operator=):
Foo& operator=(Foo const& other)
{
Foo copy(other);
swap(copy);
return *this;
}
D.
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