C++0x lambda capture by value always const?

Question

Is there any way to capture by value, and make the captured value non-const? I have a library functor that I would like to capture & call a method that is non-const but should be.

The following doesn't compile but making foo::operator() const fixes it.

struct foo {   bool operator () ( const bool & a )   {     return a;   } };   int _tmain(int argc, _TCHAR* argv[]) {   foo afoo;    auto bar = [=] () -> bool     {       afoo(true);     };    return 0; } 

Answer 1

Use mutable.

 auto bar = [=] () mutable -> bool .... 

Without mutable you are declaring the operator () of the lambda object const.