[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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