On Wed, May 12, 2004 at 10:49:51AM -0700, Adrian Bentley wrote: > Yeah, ok. I really do know what I'm talking about with C++, I just > haven't > been able to get it to do what I want :P. And I figured it was > something > like that (with respect to interpreting...), but why would it work so > easily > for the other case? (and yes just calling with the two parameters works > just > fine...) I can't get the code you posted (incomplete as it was) to compile with GCC 2.95, 3.3, 3.4, or with Comeau's compiler. > I definitely know MANY ways to get around it, but it still makes generic > programming WAY more of a pain in the ass if you can't let it figure > things > like that out for itself. The solution I posted does what you want, with little extra code. Making it do it your way would require a change to the language, which is unnecessary since you can achieve the desired effect as I showed. > Without the functionality of deriving the template for a default > argument, > which seems pretty straight forward to me by the way, it makes that a > fairly > gross limitation of gcc (lack of function specialization AND lack of > ability > to intuit from a default parameter). I know there could be some issues > depending on the order the compiler goes through the steps, but man... > it > doesn't seem that complicated (I don't have any specific reference in > Bjarne > or anything...). You never said which version of the compiler you had tried, but it doesn't matter as GCC is right to reject the code you posted. > So should I submit this as a bug then? It seems like the compiler > should be > able to do that (since it can't do def. template arguments for > functions). That's the rules of the language. As llewelly said, see 14.8.2.4/17. Calling a function template with no arguments and without explicitly stating which specialisation you want means that the compiler cannot deduce the parameters. This is not a limitation of GCC. > Of course if they add default template arguments for functions... then > it > would be fine. Suggestions? You could submit a proposal for a language change to the standards committee (but don't hold your breath for it to be accepted). jon -- "The only cure for the ills of democracy is more democracy." - Al Smith
