Question

One of the vagaries of my development system (Codegear C++Builder) is that some of the auto-generated headers insist on having…

using namespace xyzzy 

…statements in them, which impact on my code when I least want or expect it.

Is there a way I can somehow cancel/override a previous ‘using’ statement to avoid this.

Maybe…

unusing namespace xyzzy; 

Answer 1

Nope. But there’s a potential solution: if you enclose your include directive in a namespace of its own, like this…

namespace codegear {     #include 'codegear_header.h' } // namespace codegear 

…then the effects of any using directives within that header are neutralized.

That might be problematic in some cases. That’s why every C++ style guide strongly recommends not putting a ‘using namespace’ directive in a header file.