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Tip of the Day
Language: C++
Expertise: Intermediate
Oct 27, 1998

WEBINAR:

On-Demand

Building the Right Environment to Support AI, Machine Learning and Deep Learning


Inheritance Relationship of Templates

A common mistake is to assume that a vector <derived *> is like a vector <base*> if Derived is a subclass of Base. However, there is no relationship between classes generated from the same class template. As a result, this relationship doesn't hold. The reason is that templates are instantiated at compile time. A vector<Base * > has to ensure that all of its members are actually pointers to Base. Otherwise, unexpected surprises may occur at run time.
Danny Kalev
 
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