Define Missing MLTYPE Parameter

MATLAB^® automatically converts C++ types to MATLAB types, as described in C++ to MATLAB Data Type Mapping.

If the C++ type for the argument is a string, then use these options to choose values for the MLTYPE and SHAPE arguments in defineArgument statements.

C++ Type	MATLABType	DIRECTION	Options for SHAPE
char*a	"int8"	"input"	Scalar value Array of scalar values
char** char*[]	"string"	"input"	cell
const char*	"char"		Scalar value Array of scalar values
	"string"	"input"	"nullTerminated"
const char** const char*[]	"char"	"input"	Scalar value Array of scalar values
	"string"	"input"	"nullTerminated"
a These types are equivalent to MATLAB char: wchar_t char16_t char32_t