lambda : capturing a data member - is it legal?

Hi,

reading Scott Meyers' "Overview of the New C++" I stumbled over

#include <algorithm>
#include <list>

class Widget {
public:
   void doSomething();
private:
   std::list<int> li;
   int minVal;
};

void Widget::doSomething() {
   auto it = std::find_if(li.cbegin(), li.cend(),
      [minVal](int i) { return i > minVal; } // error?
   );
}

Scott says, that the second to last line is in error and 'repairs' it by
capturing 'this' instead of minVal.
On the other hand, gcc-4.5.2 accepts the code above.

If the code is is illegal, indeed, what's the rational behind it?
At the place of the definition of the lambda, the value of minVal is
available and it should thus be possible to capture it by value?

Many thanks for an explanation,
Helmut.

--
Helmut Jarausch
Lehrstuhl fuer Numerische Mathematik
RWTH - Aachen University
D 52056 Aachen, Germany

      [ See http://www.gotw.ca/resources/clcm.htm for info about ]
      [ comp.lang.c++.moderated. First time posters: Do this! ]