Training courses
Kernel and Embedded Linux
Bootlin training courses
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namespace A { int _a = 11; namespace B{ int ab = 22; namespace C{ int abc = 33; int second(){ return 0; } } int first(){ (void) _a; (void) ab; (void) C::abc; return C::second(); } } } int main() { (void) A::_a; (void) A::B::ab; (void) A::B::C::abc; return A::B::first(); }