How to turn off auto indent in C++ mode?

[Zhongxing Xu]

When I am using c++ mode to edit c++ sources, emacs always auto indent the class declarations inside a namespace. I don't want the auto indentation inside a namespace. How to turn off it?

Code example:
I want such style:

namespace foo {
class A {
};
}

emacs forces to:

namespace foo {
  class A {
  };
}

I have to delete the spaces in front of "class A" manually.  

Greetings,

Zhongxing Xu