Template specialization static assert

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Make your choice! More about Variadic Templates Make your cross! How to get your pdf bundle? Source Code GitHub. The begin and end at lines 36, 37 seem to be calculated wrongly. Please check. Not quite sure, but is there a typo in your code? This has the exact same problem : the static assertion triggers even without any use or instantiation of foo.

The solution is to use type-dependent expressions and make the condition depend on our template parameters. I usually prefer a simple helper that clearly communicates intent:. Additional discussion and comments on reddit. Title image from pixabay. Share this. A template has only one type, but a specialization is needed for pointer, reference, pointer to member, or function pointer types. The specialization itself is still a template on the type pointed to or referenced. The following code demonstrates a collection class template Bag and a partial specialization for pointer types in which the collection dereferences the pointer types before copying them to the array.

The collection then stores the values that are pointed to. With the original template, only the pointers themselves would have been stored in the collection, leaving the data vulnerable to deletion or modification. In this special pointer version of the collection, code to check for a null pointer in the add method is added.

The following example defines a template class that takes pairs of any two types and then defines a partial specialization of that template class specialized so that one of the types is int. The specialization defines an additional sort method that implements a simple bubble sort based on the integer.