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Tcl_CreateMathFunc(3)	    Tcl Library Procedures	 Tcl_CreateMathFunc(3)

______________________________________________________________________________

NAME
       Tcl_CreateMathFunc,  Tcl_GetMathFuncInfo,  Tcl_ListMathFuncs  - Define,
       query and enumerate math functions for expressions

SYNOPSIS
       #include <tcl.h>

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

       int								       |
       Tcl_GetMathFuncInfo(interp, name, numArgsPtr, argTypesPtr, procPtr, clientDataPtr)|

       Tcl_Obj *							       |
       Tcl_ListMathFuncs(interp, pattern)				       |

ARGUMENTS
       Tcl_Interp      *interp		(in)	  Interpreter  in  which   new
						  function will be defined.    |

       CONST								       |
       char	 *name		  (in)					 |     |
						  Name for new function.

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

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

       Tcl_MathProc    *proc		(in)	  Procedure  that   implements
						  the function.

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

       int	       *numArgsPtr	(out)	  Points  to  a	 variable that
						  will be set to  contain  the
						  number  of  arguments to the
						  function.

       Tcl_ValueType   **argTypesPtr	(out)	  Points to  a	variable  that
						  will	be  set	 to  contain a
						  pointer to an	 array	giving
						  the  permissible  types  for
						  each argument to  the	 func-
						  tion	which  will need to be
						  freed up using Tcl_Free.

       Tcl_MathProc    **procPtr	(out)	  Points to  a	variable  that
						  will	be  set	 to  contain a
						  pointer to  the  implementa-
						  tion	code  for the function
						  (or NULL if the function  is
						  implemented	 directly   in
						  bytecode.)

       ClientData      *clientDataPtr	(out)	  Points to  a	variable  that
						  will	be  set to contain the
						  clientData  argument	passed
						  to  Tcl_CreateMathFunc  when
						  the function was created  if
						  the  function	 is not imple-
						  mented directly in bytecode.

       CONST char      *pattern		(in)	  Pattern   to	match  against
						  function names so as to fil-
						  ter	them  (by  passing  to
						  Tcl_StringMatch), or NULL to
						  not apply any filter.
_________________________________________________________________

DESCRIPTION
       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  one  of |
       TCL_INT,	 TCL_DOUBLE,  TCL_WIDE_INT,  or TCL_EITHER to indicate whether |
       the corresponding argument  must	 be  an	 integer,  a  double-precision |
       floating value, a wide (64-bit) integer, or any, 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_WideInt wideValue;					       |
	      } Tcl_Value;						       |

       The type field indicates the  type  of  the  argument  and  is  one  of |
       TCL_INT,	 TCL_DOUBLE or TCL_WIDE_INT.  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, doubleValue or wideValue field will con- |
       tain the actual value of the argument.

       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 one  of  TCL_INT,	TCL_DOUBLE  or |
       TCL_WIDE_INT  to	 indicate  which  value was set.  Under normal circum-
       stances proc should return TCL_OK.  If an error occurs while  executing
       the  function,  proc should return TCL_ERROR and leave an error message
       in the interpreter's result.

       Tcl_GetMathFuncInfo retrieves the values associated with function  name |
       that were passed to a preceding Tcl_CreateMathFunc call.	 Normally, the |
       return code is TCL_OK  but  if  the  named  function  does  not	exist, |
       TCL_ERROR  is  returned	and  an	 error message is placed in the inter- |
       preter's result.							       |

       If an error did not occur, the array reference placed in	 the  variable |
       pointed to by argTypesPtr is newly allocated, and should be released by |
       passing it to Tcl_Free.	Some functions (the standard  set  implemented |
       in the core) are implemented directly at the bytecode level; attempting |
       to retrieve values for them causes a NULL to be stored in the  variable |
       pointed to by procPtr and the variable pointed to by clientDataPtr will |
       not be modified.							       |

       Tcl_ListMathFuncs returns a Tcl object containing a  list  of  all  the |
       math  functions	defined in the interpreter whose name matches pattern. |
       In the case of an error, NULL is returned and an error message is  left |
       in  the interpreter result, and otherwise the returned object will have |
       a reference count of zero.

KEYWORDS
       expression, mathematical function

SEE ALSO
       expr(n), info(n), Tcl_Free(3), Tcl_NewListObj(3)

Tcl				      8.4		 Tcl_CreateMathFunc(3)
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