Chapter 4. Integral Type Wrappers and Operations

As we hinted earlier, the MPL supplies a group of wrapper templates that, like int_, are used to make integer values into polymorphic metadata. There's actually more to these wrappers than meets the eye, and in this chapter we'll uncover the details of their structure. We'll also explore some of the metafunctions that operate on them, and discuss how best to write metafunctions returning integral constants.