static-const-integral in-class-init without explicit definition

[RaJ M <smrajagopal@xxxxxxxxx>]

Since when, gcc started to allow usage of

static const integral type class members to be initialized in-class
and compile/link successfully without explicit definition in .cpp

That is,
//A.h
class A
{
 public:
 int do_something_stupid();
 private:
 static const int NUM=5;
}
//A.cpp
...
int A::do_something_stupid()
{
  return NUM; //SUCCESSFUL without explicit definition
}

Thanks
Raja Gopal
smrajagopal [at] gmail [dot] com