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Compiler error w/ templates and default argument value
- From: "Peter A. Felvegi" <petschy at praire-chicken dot com>
- To: gcc at gcc dot gnu dot org
- Date: Fri, 10 Oct 2008 21:16:10 +0200 (CEST)
- Subject: Compiler error w/ templates and default argument value
Hello All,
I've run into this:
----8<----8<----8<----
template<typename F, typename A>
class B
{
protected:
static const int i = 42;
};
template<typename F, typename A>
class D : protected B<F, A>
{
public:
D(int n_ = B<F, A>::i); // line 12
};
----8<----8<----8<----
gcc-4.1 and 4.3 give the same error message:
t.cpp:12: error: expected ‘,’ or ‘...’ before ‘>’ token
t.cpp:12: error: wrong number of template arguments (1, should be 2)
t.cpp:2: error: provided for ‘template<class F, class A> class B’
t.cpp:12: error: default argument missing for parameter 2 of ‘D<F,
A>::D(int, A)’
If I write D(int n_ = (B<F, A>::i) ), then it compiles. Imho it should
compile w/o the extra parentheses. VC++ 2008 Express compiled it. Wanted
to test gcc 4.4, too, but I wasn't able to compile the 20081003 snapshot
(/usr/include/gnu/stubs.h:7:27: error: gnu/stubs-32.h: No such file or
directory). I have a debian lenny/amd64 system.
Regards, P