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c++ Programming Glossary: covariantCovariance and contravariance in programming languages http://stackoverflow.com/questions/1163465/covariance-and-contravariance-in-programming-languages contains elements of type T for some T . List would be covariant if S is a subtype of T iff List S is a subtype of List T Where..
When is C++ covariance the best solution? http://stackoverflow.com/questions/1260757/when-is-c-covariance-the-best-solution ago and made me realise that I have never actually used covariant return types in my own code. For those not sure what covariance.. return types of the two f functions are said to be covariant. Older versions of C required the return types to be the same.. So my question Does anyone have a real world example where covariant return types of virtual functions are required or produce a..
Why doesn't this C++ template code compile? http://stackoverflow.com/questions/1364837/why-doesnt-this-c-template-code-compile by the way is why it's difficult to implement a properly covariant clone method using templates. See here and here mine . share..
How can I use covariant return types with smart pointers? http://stackoverflow.com/questions/196733/how-can-i-use-covariant-return-types-with-smart-pointers can I use covariant return types with smart pointers I have code like this class.. overriding virtual function return type differs and is not covariant . If I do not use boost shared_ptr but return raw pointers the.. raw pointers the code compiles I understand this is due to covariant return types in C . I can see the problem is because boost shared_ptr..
http://stackoverflow.com/questions/2203388/c-templates-polymorphism Apple no problem here If templates were covariant the following would be legal std vector Fruit fruit_vec apple_vec..
C++: How can I avoid “invalid covariant return type” in inherited classes without casting? http://stackoverflow.com/questions/2410532/c-how-can-i-avoid-invalid-covariant-return-type-in-inherited-classes-withou How can I avoid &ldquo invalid covariant return type&rdquo in inherited classes without casting I have.. relation ship. I obtain a test.cpp 22 error invalid covariant return type for ˜virtual D B outC error since the compiler does.. question I know of no way of having directly coupled covariant members in C . You'll have either to add a layer or implement..
C++ virtual function return type http://stackoverflow.com/questions/4665117/c-virtual-function-return-type a different return type as long as the return type is covariant with the original return type. For example consider the following..
Copying a Polymorphic object in C++ http://stackoverflow.com/questions/5148706/copying-a-polymorphic-object-in-c 0 class Derivedn public Base public This is OK its called covariant return type. Derivedn Clone return new Derivedn this private..
http://stackoverflow.com/questions/639248/c-covariant-templates covariant templates I feel like this one has been asked before but I'm.. it on SO nor can I find anything useful on Google. Maybe covariant isn't the word I'm looking for but this concept is very similar.. word I'm looking for but this concept is very similar to covariant return types on functions so I think it's probably correct...
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