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Let's say I have some templated class depending on type T . T could be almost anything: int , int* , pair <int, int> or struct lol ; it cannot be void , a reference or anything cv-qualified though. For some optimization I need to know if I can subclass T . So, I'd need some trait type is_subclassable , determined as a logical combination of basic traits or through some SFINAE tricks. In the original example, int and int* are not subclassable, while pair <int, int> and struct lol are. EDIT : As litb pointed out below, unions are also not subclassable and T can be a union type as well. How do I write the trait type I need?
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