C++ Global variable declaration

If you can use C++17, consider using an inline variable:

// in a header file
inline bool bShouldRegister = true;

See How do inline variables work? for more information.

You should use extern otherwise you will have separated bShouldRegister variables in each translation unit with probably different values.

Put this in a header file (.h):

extern bool bShouldRegister;

Put this in one of implementation files (.cpp):

bool bShouldRegister;

Another way which is simpler is to use inline keyword. Put you variable in a header file as below:

inline bool bShouldRegister;

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