[Bug libstdc++/59182] New: can't convert from void (T::*)() to std::function<void()>

sequoiahead at gmail dot com gcc-bugzilla@gcc.gnu.org
Mon Nov 18 23:16:00 GMT 2013


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59182

            Bug ID: 59182
           Summary: can't convert from void (T::*)() to
                    std::function<void()>
           Product: gcc
           Version: 4.8.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: sequoiahead at gmail dot com

Created attachment 31242
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=31242&action=edit
gcc -v output

I'm trying to compile following piece of code:

#include <functional>

struct Func {
    void func() {}
    void pfunc(int p) {}
};

int main(int argc, char** argv) {
    Func fInstance;
    std::function<void(int)> voidMemberParamFunc = std::bind(&Func::pfunc,
fInstance, std::placeholders::_1);
    std::function<void()> voidMemberFunc = std::bind(&Func::func, fInstance,
std::placeholders::_1); //compilation fails here
}

via "g++ -MMD -MP -D_DEBUG -Werror -Wall -g -std=c++11 -fno-rtti -o "main.o" -c
"main.cpp"

and receive following error:
main.cpp:24:96: error: conversion from 'std::_Bind_helper<false, void
(Func::*)(), Func&, const std::_Placeholder<1>&>::type {aka
std::_Bind<std::_Mem_fn<void (Func::*)()>(Func, std::_Placeholder<1>)>}' to
non-scalar type 'std::function<void()>' requested
  std::function<void()> voidMemberFunc = std::bind(&Func::func, fInstance,
std::placeholders::_1); //compilation fails here

The problem is that the compiler is able to convert void Func::pfunc(int) to
std::function<void(int)>, but can't convert void Func::func() to
std::function<void()>



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