Compilare: main.cpp: In member function 'void RBT::__p2__(std::ostream&, node*)': main.cpp:152:5: warning: this 'if' clause does not guard... [-Wmisleading-indentation] if (a->left != TNULL) ^~ main.cpp:154:9: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if' os << a->val << " "; ^~