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Tcl_CreateMathFunc(3)	    Tcl Library Procedures	 Tcl_CreateMathFunc(3)


       Tcl_CreateMathFunc - Define a new math function for expressions

       #include <tcl.h>

       Tcl_CreateMathFunc(interp, name, numArgs, argTypes, proc, clientData)

       Tcl_Interp      *interp	    (in)      Interpreter  in  which new func‐
					      tion will be defined.

       char	       *name	    (in)      Name for new function.

       int	       numArgs	    (in)      Number of arguments to new func‐
					      tion;    also   gives   size  of
					      argTypes array.

       Tcl_ValueType   *argTypes    (in)      Points to an  array  giving  the
					      permissible types for each argu‐
					      ment to function.

       Tcl_MathProc    *proc	    (in)      Procedure	 that  implements  the

       ClientData      clientData   (in)      Arbitrary one-word value to pass
					      to proc when it is invoked.

       Tcl allows a number of mathematical functions to	 be  used  in  expres‐
       sions, such as sin, cos, and hypot.  Tcl_CreateMathFunc allows applica‐
       tions to add additional functions to those already provided by  Tcl  or
       to  replace existing functions.	Name is the name of the function as it
       will appear in expressions.  If name doesn't already exist as  a	 func‐
       tion then a new function is created.  If it does exist, then the exist‐
       ing function is replaced.  NumArgs and argTypes describe the  arguments
       to  the	function.   Each  entry	 in  the argTypes array must be either
       TCL_INT, TCL_DOUBLE, or TCL_EITHER to indicate whether the  correspond‐
       ing  argument must be an integer, a double-precision floating value, or
       either, respectively.

       Whenever the function is invoked in an expression Tcl will invoke proc.
       Proc should have arguments and result that match the type Tcl_MathProc:
	      typedef int Tcl_MathProc(
		ClientData clientData,
		Tcl_Interp *interp,
		Tcl_Value *args,
		Tcl_Value *resultPtr);

       When  proc  is  invoked the clientData and interp arguments will be the
       same as those passed to Tcl_CreateMathFunc.   Args  will	 point	to  an
       array  of numArgs Tcl_Value structures, which describe the actual argu‐
       ments to the function:
	      typedef struct Tcl_Value {
		Tcl_ValueType type;
		long intValue;
		double doubleValue;
	      } Tcl_Value;

       The type field indicates the type of the argument and is either TCL_INT
       or  TCL_DOUBLE.	 It  will  match  the argTypes value specified for the
       function unless the argTypes value was  TCL_EITHER.  Tcl	 converts  the
       argument	 supplied in the expression to the type requested in argTypes,
       if that is necessary.  Depending on the value of the  type  field,  the
       intValue	 or  doubleValue  field	 will  contain the actual value of the

       Proc should compute its result and store it either  as  an  integer  in
       resultPtr->intValue  or	as a floating value in resultPtr->doubleValue.
       It should set also resultPtr->type to either TCL_INT or	TCL_DOUBLE  to
       indicate	 which	value was set.	Under normal circumstances proc should
       return TCL_OK.  If an error occurs while executing the  function,  proc
       should return TCL_ERROR and leave an error message in interp->result.

       expression, mathematical function

Tcl				      7.0		 Tcl_CreateMathFunc(3)
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