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#### So How are Policies Used Anyway?

The details follow later, but basically policies can be set by either:

- Defining some macros that change the default behaviour: this is the recommended method for setting installation-wide policies.
- By instantiating a distribution object with an explicit policy: this is mainly reserved for ad hoc policy changes.
- By passing a policy to a special function as an optional final argument: this is mainly reserved for ad hoc policy changes.
- By using some helper macros to define a set of functions or distributions in the current namespace that use a specific policy: this is the recommended method for setting policies on a project- or translation-unit-wide basis.

The following sections introduce these methods in more detail.