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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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@ -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 capture method arguments and assign them to the following VALUE
references. 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 The following is an example of a method that takes arguments by Ruby's
array: 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(). 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, ...) :: rb_scan_args(int argc, VALUE *argv, const char *fmt, ...) ::
Retrieve argument from argc and argv to given VALUE references Retrieve argument from argc and argv to given VALUE references