C++Talk.NET

Immanuel Scholz · Guest

Given the following code:

struct source {};
struct hop {
hop(source) {}
};
struct destination {
destination(hop) {}
};

destination foo() {
return source();
}

I thought function foo may not return a source-class directly, since
this would involve more than one user defined convertation
(source->hop->destination) and this is explicit forbidden by the
standard? (At least to make function calls valid?)

Well, suprisly, it works on some of my tested compilers (MSVC, Digital
Mars C++) while it don't work on others (gcc).

What says the standard about it? May I use more than one conversation
in return values and even claim standard conformity?

Ciao, Imi.

PS:
At least

void bar(destination) {}
...
bar( source() );

did not compile on any compiler I tested - as suspected.

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