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extension.rdoc: rb_check_arity [ci skip]

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* doc/extension.rdoc (rb_check_arity): described.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56130 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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nobu 2016-09-10 08:16:50 +00:00
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doc/extension.rdoc
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@ -867,6 +867,9 @@ arguments. The third argument is a string that specifies how to
capture method arguments and assign them to the following VALUE
references.
You can just check the argument number with rb_check_arity(), this is
handy in the case you want to treat the arguments as a list.
The following is an example of a method that takes arguments by Ruby's
array:
@ -1360,6 +1363,12 @@ rb_define_singleton_method(VALUE klass, const char *name, VALUE (*func)(), int a
Defines a singleton method. Arguments are same as rb_define_method().
rb_check_arity(int argc, int min, int max) ::
Check the number of arguments, argc is in the range of min..max. If
max is UNLIMITED_ARGUMENTS, upper bound is not checked. If argc is
out of bounds, an ArgumentError will be raised.
rb_scan_args(int argc, VALUE *argv, const char *fmt, ...) ::
Retrieve argument from argc and argv to given VALUE references