use c++11 lambda in non-static member function and call static member function of same class

Question

Possible Duplicate:
lambdas require capturing 'this' to call static member function?

I want to use c++11 lambda in a non-static member function and call a static member function of same class:

class A {
    static void a() {}
public:
    void x() {
        [] () { A::a(); }();
    }
};

But gcc4.6 and gcc4.7 both got an error: error: 'this' was not captured for this lambda function

Why does lambda need 'this' since 'a' is a static member function.

And if 'x' is static or 'a' is static member function of other class, 'this' is not necessary, why?

Why do you require lambda in this case? why don't you simple call `A::a()`? — Naveen, Jun 18 '12 at 05:06
The other question doesn't have the appropriate bug id though. Should it be edited in? — dirkgently, Jun 18 '12 at 05:36

score 1 · Accepted Answer · edited May 23 '17 at 12:12

1

class A {
    static void a() {}
public:
    void x() {
        [] () { A::a(); }();
    }
};

int main() { A a; a.x(); }

This compiles fine with clang 3.2. Also, there is no reason why this shouldn't be compile. This is a bug in GCC as per the notes. This ought to be fixed in 4.7.1. Note that gcc started early but has lagged behind clang in supporting some of the C++11 features.

Edit: There is a similar SO question which you may want to check out.

edited May 23 '17 at 12:12

Community

1
1

answered Jun 18 '12 at 05:10

dirkgently

108,024
16
131
187

Seems it is a gcc's bug and gcc4.7.1 is still wrong. Wish 4.7.2 can fix it. – sealiay Jun 18 '12 at 05:33
@sealiay: I think you should post your findings on GCC's bug notes! (Don't forget to mention the platform you're on and other required details.) – dirkgently Jun 18 '12 at 05:35

use c++11 lambda in non-static member function and call static member function of same class

1 Answers1