| Constness | ||
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Appendix A. The RefPtr smartpointer | 
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| Constness | ||
|---|---|---|
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Appendix A. The RefPtr smartpointer |
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The use of the const keyword in C++ is not always clear. You
might not realise that const Something* declares a pointer to a
const Something. The pointer can be changed, but not the
Something that it points to.
Therefore, the RefPtr equivalent of
Something* for a method parameter is const
Glib::RefPtr<Something>&, and the equivalent of
const Something* is const Glib::RefPtr<const
Something>&.
The const ... & around both is just for efficiency, like
using const std::string& instead of
std::string for a method parameter to avoid unnecessary
copying.
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| Checking for null |  |
Appendix B. Signals |