Kevin Reid at 03:46, 7 August 2011

2011-08-07T03:46:38Z

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'''__respondsTo/2''' is a [[Miranda message]] for asking whether an object understands a message.

{{instance msgdoc|__respondsTo|2|<var>verb</var> :[[Verb]], <var>arity</var> :([[int]] > 0)|[[boolean]]}}

Returns a boolean indicating whether this object responds to messages with the verb <var>verb</var> and arity (number of arguments) <var>arity</var>.

The Miranda method for E-language objects is:
# If this object has a method with the given verb and arity, return true.
# If there is a [[Miranda method]] with the given verb and arity, return true.
# If the object has a [[matcher]], return the result of invoking the matcher with the __respondsTo message. If the matcher does not match, return false.
# Return false.
{{XXX|confirm this is an accurate description of current behavior.}}

[[Category:Miranda messages]]

Miranda respondsTo - Revision history

Kevin Reid at 03:46, 7 August 2011