Rule for lambda capture variable

Question

For example:

class Example
{
public:
    explicit Example(int n) : num(n) {}
    void addAndPrint(vector& v) const
    {
        for_each(v.begin(         


        

Answer 1

5.1.2/9:

The reaching scope of a local lambda expression is the set of enclosing scopes up to and including the innermost enclosing function and its parameters.

and 5.1.2/10:

The identifiers in a capture-list are looked up using the usual rules for unqualified name lookup (3.4.1); each such lookup shall find a variable with automatic storage duration declared in the reaching scope of the local lambda expression.

As num is neither declared in any function scope nor has automatic storage duration, it cannot be captured. Thus VS is right and g++ is wrong.