Re: outer class `this` in local classes without inheritance?

From:

Anthony Williams <anthony.ajw@gmail.com>

Newsgroups:

comp.lang.c++.moderated

Date:

Tue, 27 Jul 2010 08:44:33 CST

Message-ID:

<87iq414dol.fsf@dell.justsoftwaresolutions.co.uk>

Lorenzo Caminiti <lorcaminiti@gmail.com> writes:

Is there a way to access the outer class `this` from a local class but
without using inheritance?

Pass it in to the local class either as a constructor parameter or a
function parameter:

#include <iostream>
class X
{
private:
    void g()
    {
        std::cout<<"g(), this="<<this<<std::endl;
    }
public:
    void f()
    {
        std::cout<<"f(), this="<<this<<std::endl;
        struct local
        {
            X* self;
            local(X* self_):
                self(self_)
            {}

            void foo()
            {
                self->g();
            }
        };

        local y(this);
        y.foo();
    }
};

int main()
{
    X x;
    x.f();
}

Anthony
--
Author of C++ Concurrency in Action http://www.stdthread.co.uk/book/
just::thread C++0x thread library http://www.stdthread.co.uk
Just Software Solutions Ltd http://www.justsoftwaresolutions.co.uk
15 Carrallack Mews, St Just, Cornwall, TR19 7UL, UK. Company No. 5478976

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