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C++ - forward declaration with namespace

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In C++, one sometimes uses this kind of declaration to prevent circular includes and redefinitions problems :
class B;

class A {
 B *myVar;
How to do the same when B is in another namespace ? I tried to write class thenamespace::B; but it doesn't work. 'using namespace ' doesn't work either because you need the .h and I don't want to include it. Any hint ?

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