[LLVMbugs] [Bug 11601] New: Range-based for cannot iterate over explicitly typed function pointers

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=11601

             Bug #: 11601
           Summary: Range-based for cannot iterate over explicitly typed
                    function pointers
           Product: clang
           Version: 3.0
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++0x
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: ainsaar at gmail.com
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified


Consider the following code (test.cpp) trying different ways of iterating over
an array of function pointers.

/////////////////////////////////////////
void v() {}

int main() {
    void (*vv[])() = {v, v, v};
    typedef void (*type)();
    for (type i : vv) i();
    for (decltype(*vv) i : vv) i();
    for (auto i : vv) i();
    for (void (*i)() : vv) i(); // Does not compile
    return 0;
}
/////////////////////////////////////////

Clang++ 3.0  gives the following errors:

$ clang++ test.cpp -std=c++11 -Wall -pedantic

test.cpp:10:17: error: use of undeclared identifier 'i'
    for (void (*i)() : vv) i(); // Does not compile
                ^
test.cpp:10:26: error: expected ';' in 'for' statement specifier
    for (void (*i)() : vv) i(); // Does not compile
                         ^
test.cpp:10:28: error: use of undeclared identifier 'i'
    for (void (*i)() : vv) i(); // Does not compile
                           ^
3 errors generated.


I think it should be possible to iterate over an array of function pointers
using a range-based for loop with an iterator whose type has been spelled out.

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