It seems everywhere I read that either a library boasts if not needing RTTI or an article advises against its use. What is so bad about it and why is it such a good thing not to need it?
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It seems everywhere I read that either a library boasts if not needing RTTI or an article advises against its use. What is so bad about it and why is it such a good thing not to need it?
Thanks
Because using it usually means you are subverting polymorphism (
if (type is foo) { do this; } else if (type is bar) { do that; } else ...), which usually means you have engineered yourself into a corner and need to rethink your design.Because authors of C++ compilers put a lot of effort into optimising polymorphic behaviour, but less so into optimising use of RTTI.