fwrap

Arguments: primary-function indicator fwrap-function

Returns the primary function object, after giving it an indicated fwrapper. Arguments primary-function and fwrap-function can each either be a function-spec or the actual function object. indicator may be any object for which eq comparisons are appropriate, as if with getf. Typically this might be a symbol.

The ordering of fwrapped functions is specified as follows: If an fwrapper of the same indicator was present on this primary-function before the call, then the order is not changed; the fwrap call simply replaces that fwrapper with the specified fwrap-function wherever it was previously. If no fwrapper of the same indicator yet existed on this primary-function, then a new fwrapper is established as the outermost fwrapper, i.e. the one which will be called before any others.

The ordering of the fwrappers can be manipulated by using fwrap-order.

Whenever the primary-function is described using describe, all fwrappers wrapped around the primary-function are listed in their outermost to innermost order.

See fwrappers-and-advice.htm for information of fwrapping functions (and on the older, deprecated advice facility).

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This page was not revised from the 8.1 page.
Created 2010.1.21.