[LLVMbugs] [Bug 21026] New: not1 + mem_fn does not work together

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Mon Sep 22 04:55:24 PDT 2014


            Bug ID: 21026
           Summary: not1 + mem_fn does not work together
           Product: libc++
           Version: unspecified
          Hardware: PC
                OS: MacOS X
            Status: NEW
          Severity: normal
          Priority: P
         Component: All Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: thomas.sanchz at gmail.com
                CC: llvmbugs at cs.uiuc.edu, mclow.lists at gmail.com
    Classification: Unclassified

While nesting algorithms and functor I stumble upon a code that does not

#include <functional>
#include <algorithm>

struct Test { bool pred() const { return true; } };
int main(int argc, char *argv[])
  Test* t = nullptr;

  // does not work: error: no matching function for call to object of type
'const std::__1::__mem_fn<bool (Test::*)() const>
  auto f1 = std::not1(std::mem_fn(&Test::pred));
  // works
  auto f2 = std::not1(std::mem_fun(&Test::pred));
  // works
  auto f3 = std::not1(std::bind(&Test::pred, std::placeholders::_1));

Compiled with: clang++ -O0 -Wall -std=c++11 test.cpp on Mac OS X:
Apple LLVM version 6.0 (clang-600.0.54) (based on LLVM 3.5svn)
Target: x86_64-apple-darwin13.4.0
Thread model: posix

Funny thing, with GCC, it is f3 which do not compile :)

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