Christian Fröbel writes:
> Hi there,
>
> Christian Fröbel wrote:
> > I'm having problems with a non-const copy constructor.
>
> I'd like to correct myself. This problem dosn't seem to be related to the copy
> constructor at all. The problem is that I'm not allowed to make a non-const
> reference to a temporary object. For example code like this doesn't compile:
>
> class C {};
>
> void foo (C& c) {}
>
> int main (void)
> {
> foo (C()); // <== problem
> return 0;
> }
>
> The error message I get here is:
> conversion.cpp:48: error: invalid initialization of non-const reference of
> type øC&ù from a temporary of type øCù
> conversion.cpp:42: error: in passing argument 1 of øvoid foo(C&)ù
>
> I read §5.5 in Stroustrup's C++ Programming Language regadring that topic but
> couldn't find anything of real use there.
I can. "The initializer of a const T& need not be an lvalue..." In
other words, although he doesn't explicitly say so, the initializer of
a const T& has to be an lvalue.
> I understand that it generally doesn't make sense to alter a
> temporary object. But why forbid it?
Because, semantically speaking, it makes no sense.
But we're way off topic now.
Andrew.
