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4. MOP Specification

For an introduction to metaobjects and the metaobject protocol, see Metaobjects and the Metaobject Protocol.

The aim of the MOP specification in this chapter is to specify all the customizable generic function invocations that can be made by the standard GOOPS syntax, procedures and methods, and to explain the protocol for customizing such invocations.

A generic function invocation is customizable if the types of the arguments to which it is applied are not all determined by the lexical context in which the invocation appears. For example,

When using this rule to decide whether a given generic function invocation is customizable, we ignore arguments that are expected to be handled in method definitions as a single “rest” list argument.

For each customizable generic function invocation, the invocation protocol is explained by specifying

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