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What is the template typename keyword used for?

April 26, 2017keyword Template typename Used

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What is the template typename keyword used for?

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For starters, typename can be used instead of class when declaring template parameters, for instance this: template class xyz { }; could have been written as: template class xyz { }; These two definitions of xyz are considered equivalent since template parameters using class or typename are, in that syntactic position, and in that syntactic way, interchangeable. Note the parameter is T. Which way you favor is a style issue and up to you. However, note that this is wrong: typename xyz2 { }; as it is not describing/pertaining to a template parameter. Also, note that these are wrong: template typename xyz3 { }; template typename xyz4 { }; for the same reason: that use of typename outside of the angle brackets is not being applied to the template parameter and hence not allowed. Instead a class structure was desired, therefore, the intent was to define a class, as usual, not a parameterized typename for xyz3 and xyz4. Therefore, it is also wron