Type Alias mrb_args_format 

pub type mrb_args_format = *const c_char;

Format specifiers for {mrb_get_args} function

Must be a C string composed of the following format specifiers:

char	Ruby type	C types	Notes
o	{Object}	{mrb_value}	Could be used to retrieve any type of argument
C	{Class}/{Module}	{mrb_value}	when ! follows, the value may be nil
S	{String}	{mrb_value}	when ! follows, the value may be nil
A	{Array}	{mrb_value}	when ! follows, the value may be nil
H	{Hash}	{mrb_value}	when ! follows, the value may be nil
s	{String}	const char *, {mrb_int}	Receive two arguments; s! gives (NULL,0) for nil
z	{String}	const char *	NULL terminated string; z! gives NULL for nil
a	{Array}	const {mrb_value} *, {mrb_int}	Receive two arguments; a! gives (NULL,0) for nil
c	{Class}/{Module}	strcut RClass *	c! gives NULL for nil
f	{Integer}/{Float}	{mrb_float}
i	{Integer}/{Float}	{mrb_int}
b	boolean	{mrb_bool}
n	{String}/{Symbol}	{mrb_sym}
d	data	void *, {mrb_data_type} const	2nd argument will be used to check data type so it won’t be modified; when ! follows, the value may be nil
I	inline struct	void *, struct RClass	I! gives NULL for nil
&	block	{mrb_value}	&! raises exception if no block given.
*	rest arguments	const {mrb_value} *, {mrb_int}	Receive the rest of arguments as an array; *! avoid copy of the stack.
|	optional		After this spec following specs would be optional.
?	optional given	{mrb_bool}	TRUE if preceding argument is given. Used to check optional argument is given.
:	keyword args	{mrb_kwargs} const	Get keyword arguments. @see mrb_kwargs

@see mrb_get_args

Immediately after format specifiers it can add format modifiers:

char	Notes
!	Switch to the alternate mode; The behaviour changes depending on the format specifier
+	Request a not frozen object; However, except nil value