Ted:
Good comments on copy ctors.
> Having a copy ctor and no
> operator=() is almost always an error. (Actually implementing an
> operator= is a bit tricky as it must deal properly with self-assignment.)
We've had a few bugs because copy ctor and operator=() didn't agree,
usually because one was updated but the other wasn't. I don't think we
have any situations where they shouldn't completely agree.
One way to make them always agree is to have operator=() use explicit dtor
and placement new. Then any change to the copy ctor is automatically
shared. This recipe only requires replacing Classname:
Classname& operator=(const Classname& other)
{
if (this != &other) {
this->~Classname();
new(this) Classname(other);
}
return *this;
}
Caveat: It's not meant for base classes.
Tom Breton (Tehom)
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