Friday, November 19, 2010

template and OO are orthogonal constructs

11) Template and OO are orthogonal constructs. Some might see a concrete template class as a subclass? Probably not. In classic OO Analysis and Design, there's no place for templates.

22) Template is one level higher than OO. So-called "Meta-programming".

12) You can have template-only or OO-only systems, or you can have template+OO systems. Simplest is a template used in class derivation. There are only a few proven ways to integrate templates into an OO system.

12a) STL is NOT one of them. STL is high-template, low-OO.

12b) <T extends Comparable> in java is an excellent way to combine them.


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My first focus on the template+OO integration is the role of the actual type. See other posts on allocator and comparator. Only if you are already thoroughly familiar with has-a, then only you can understand how the actual type is used in OO and how it interacts with has-a.

A concrete template class could treat the actual type as an OO "component", but I feel it's very different from a regular field.

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