Question

I have hit some strange compiler error involving local classes and lambdas. I have narrowed it down to the following example:

int main()
{
    class test {
        void foo(int bar) {
            auto lambda = [=] (int) { return bar; };
        }
    };
    return 0;
}

And VS10 says:

error C2326: ‘void main::test::foo(int)’ : function cannot access ‘bar’

Are there any limitations on using lambdas in local classes or is this a bug in the compiler?

Thanks four your help.

Answer 1

I can confirm that this happens in VS10 only when the class is defined in a function and the lambda accepts a parameter.
No such problems appear in g++.

I believe this is indeed a bug, if you open a defect please link to it here so we can follow up on it (otherwise let me know and I’ll open a defect).