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List:       llvm-bugs
Subject:    [LLVMbugs] [Bug 13235] New: terrible diagnostic text taking address of bound member function
From:       bugzilla-daemon () llvm ! org
Date:       2012-06-29 2:36:24
Message-ID: bug-13235-206 () http ! llvm ! org/bugs/
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http://llvm.org/bugs/show_bug.cgi?id=13235

             Bug #: 13235
           Summary: terrible diagnostic text taking address of bound
                    member function
           Product: clang
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++
        AssignedTo: unassignedclangbugs@nondot.org
        ReportedBy: nlewycky@google.com
                CC: dgregor@apple.com, llvmbugs@cs.uiuc.edu
    Classification: Unclassified


This snippet comes from test/SemaCXX/member-pointer.cpp, so we really have no
excuse:

namespace pr5985 {
  struct c {
    void h();
    void f() {
      void (c::*p)();
      p = &h; // expected-error {{must explicitly qualify}}
      p = &this->h; // expected-error {{cannot create a non-constant pointer to
member function}}
      p = &(*this).h; // expected-error {{cannot create a non-constant pointer
to member function}}
    }
  };
}

What is this "non-constant" nonsense? The error is that we're trying to create
a pointer to a bound member function. Look at what GCC says on the same
snippet:

z.cc: In member function ‘void pr5985::c::f()':
z.cc:6: error: ISO C++ forbids taking the address of an unqualified or
parenthesized non-static member function to form a pointer to member function. 
Say ‘&pr5985::c::h'
z.cc:7: error: ISO C++ forbids taking the address of a bound member function to
form a pointer to member function.  Say ‘&pr5985::c::h'
z.cc:8: error: ISO C++ forbids taking the address of an unqualified or
parenthesized non-static member function to form a pointer to member function. 
Say ‘&pr5985::c::h'

That's better. GCC even includes a "fixit".

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