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prototype

Perl 5 version 12.3 documentation
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prototype

  • prototype FUNCTION

    Returns the prototype of a function as a string (or undef if the function has no prototype). FUNCTION is a reference to, or the name of, the function whose prototype you want to retrieve.

    If FUNCTION is a string starting with CORE:: , the rest is taken as a name for a Perl builtin. If the builtin is not overridable (such as qw//) or if its arguments cannot be adequately expressed by a prototype (such as system), prototype() returns undef, because the builtin does not really behave like a Perl function. Otherwise, the string describing the equivalent prototype is returned.