Re: Small question about operator overloading
Alex Snast wrote:
I'm wondering if it common to return a const reference to an object
const BinSearchTree& operator= (const BinSearchTree& rhs)
throw(bad_alloc);
or
BinSearchTree& operator= (const BinSearchTree& rhs)
throw(bad_alloc);
is there any standard on those
There is no standard, but we know that the built-in operator= has the
signature such that it returns a reference to *non-const* object. That
can be used as a hint. The point in most cases is that if you can
assign to that object, you should be able to call a non-const member
function. Example:
struct NormalAssignment
{
void foo() {}
};
struct OpAssReturnsConst
{
OpAssReturnsConst const& operator=(OpAssReturnsConst const&)
{ return *this; }
void foo() {}
};
int main()
{
NormalAssignment n1, n2;
(n1 = n2).foo(); // assign to n1, then call foo() for it.
OpAssReturnsConst c1, c2;
(c1 = c2).foo(); /// OOPS
}
V
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