[LLVMbugs] [Bug 17015] New: Can't initialize a function pointer with template parameter using C++-style initialization and a cast

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=17015

            Bug ID: 17015
           Summary: Can't initialize a function pointer with template
                    parameter using C++-style initialization and a cast
           Product: clang
           Version: 3.3
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: abbeyj at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Created attachment 11105
  --> http://llvm.org/bugs/attachment.cgi?id=11105&action=edit
Test case

The following test case (also attached) is rejected by clang but accepted by
gcc, MSVC and the VMS C++ compiler.

template <typename T>
class D {};

void foo(int, D<int>&)
{
}

void bar()
{
    void (*pfoo1)(int, D<int>&) = (void (*)(int, D<int>&))foo;    // ok
    void (*pfoo2)(int, D<int>&) ( (void (*)(int, D<int>&))foo );  // error
}


Output from attempting to compile:
fptr.cpp:11:47: error: expected parameter declarator
        void (*pfoo2)(int, D<int>&) ( (void (*)(int, D<int>&))foo );  // error
                                                     ^
fptr.cpp:11:53: error: expected ')'
        void (*pfoo2)(int, D<int>&) ( (void (*)(int, D<int>&))foo );  // error
                                                           ^
fptr.cpp:11:41: note: to match this '('
        void (*pfoo2)(int, D<int>&) ( (void (*)(int, D<int>&))foo );  // error
                                               ^
fptr.cpp:11:9: error: cannot initialize a variable of type 'void (*)(int,
D<int> &)' with an rvalue of type 'void (*)(int)': different number of
parameters (2 vs 1)
        void (*pfoo2)(int, D<int>&) ( (void (*)(int, D<int>&))foo );  // error
               ^                      ~~~~~~~~~~~~~~~~~~~~~~~~~~~
3 errors generated.

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