[Bug c++/15201] New: Parsing Problem with template (with > 1type) as default parameter

[uwe dot arzt at robots dot de]

Hi,

// Bug: default Parameter with a template-Type does not work with more than 1
template parameter
#include <stdio.h>
template <typename _type> class A
{
    _type local;
    public:
        A(_type val) { local=val; printf("A\n"); }
};
template <typename _type, typename _type1> class B
{
    _type local;
    public:
        B(_type val) { local=val; printf("B\n"); }
};
template<typename _type, typename _type1> class C
{
    public:
        C() { printf("C\n"); }
        void proc1(A<_type> par = A<_type>(42))  {}; // works

        // doesnt't work --> compile error
        #ifdef CASE1
            void proc2(B<_type, _type1> par = B<_type, _type1>(42)) {};
        #endif

        // works
        #ifdef CASE2
            typedef B<_type, _type1> yyy;
            void proc2(B<_type, _type1> par = yyy(42)) {}; 
        #endif
};
main() 
{
    C<int, int> c;
    c.proc1();
    c.proc2();
}

results in compiler output:

CASE1:

arzt@dbnu003{~/g++} /opt/gcc-3.4/bin/g++ -DCASE1 test1.cpp
test1.cpp:25: error: expected `,' or `...' before '>' token
test1.cpp:25: error: missing `>' to terminate the template argument list
test1.cpp:25: error: wrong number of template arguments (1, should be 2)
test1.cpp:12: error: provided for `template<class _type, class _type1> class B'
test1.cpp: In function `int main()':
test1.cpp:38: error: no matching function for call to `C<int, int>::proc2()'
test1.cpp:25: note: candidates are: void C<_type, _type1>::proc2(B<_type,
_type1>, _type1) [with _type = int, _type1 = int]

CASE2:

arzt@dbnu003{~/g++} /opt/gcc-3.4/bin/g++ -DCASE2 test1.cpp
arzt@dbnu003{~/g++} ./a.out
C
A
B

I think both codes sequences are correct and should behave identical.

Same Problem with g++ 3.3.3.

The following compilers work correctly: SunWorkshop 8, HP Tru64 CXX 6.5, MS
Visual C++ 6.0 SP5

Thanks 

Uwe

-- 
           Summary: Parsing Problem with template (with > 1type)  as default
                    parameter
           Product: gcc
           Version: 3.4.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: uwe dot arzt at robots dot de
                CC: gcc-bugs at gcc dot gnu dot org
  GCC host triplet: x86_64-unknown-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15201