Recurring template

CRTP is used to solve this in compile time so the execution will be faster. Try making a plain function that expects an abstract Writer: you can't do it because there is no class named Writer anywhere, so where's your polymorphism exactly? This is not equivalent with virtual functions at all and it's far less useful.

It might also be worth it in this example to add an example of how to implement a default foo in the Base class that will be called if no Derived has implemented it. AKA change foo in the Base to some other name e. Then call caller inside of ProcessFoo — wizurd. This is my favourite answer, since it also shows why this pattern is useful with the ProcessFoo function.

GabrielDevillers Firstly, the templatized ProcessFoo will work with any type that implements the interface i. Second, in order to get a non-templatized ProcessFoo to work with multiple types, you would likely end up using RTTI which is what we want to avoid.

Moreover, templatized version provides you compilation time check on the interface. Show 1 more comment. This is not a direct answer, but rather an example of how CRTP can be useful. Just as note: CRTP could be used to implement static polymorphism which like dynamic polymorphism but without virtual function pointer table. Jichao Jichao If you want to see the corner case anyway even though it does not cause error see here: ideone.

Bad example. This code could be done with no vtable s without using CRTP. What vtable s truly provide is using the base class pointer or reference to call derived methods. You should show how it is done with CRTP here. Jichao, according to MikeMB 's note, you should call methodImpl in the method of Base and in derived classes name methodImpl instead of method — Ivan Kush. Because anyway you couldn't use it polymorphically through base class pointer or ref. Show 4 more comments. Sign up or log in Sign up using Google.

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Performance numbers might differ in different runs, but small performance gain is expected from CRTP. Keep them coming. We would love to answer. If you like GeeksforGeeks and would like to contribute, you can also write an article and mail your article to review-team geeksforgeeks. See your article appearing on the GeeksforGeeks main page and help other Geeks. Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above.

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