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-'\"
-'\" Copyright (c) 1989-1993 The Regents of the University of California.
-'\" Copyright (c) 1994-1996 Sun Microsystems, Inc.
-'\"
-'\" See the file "license.terms" for information on usage and redistribution
-'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
-'\"
-.TH Tcl_CreateMathFunc 3 8.4 Tcl "Tcl Library Procedures"
-.so man.macros
-.BS
-.SH NAME
-Tcl_CreateMathFunc, Tcl_GetMathFuncInfo, Tcl_ListMathFuncs \- Define, query and enumerate math functions for expressions
-.SH "NOTICE OF EVENTUAL DEPRECATION"
-.PP
-The \fBTcl_CreateMathFunc\fR and \fBTcl_GetMathFuncInfo\fR functions
-are rendered somewhat obsolete by the ability to create functions for
-expressions by placing commands in the \fBtcl::mathfunc\fR namespace,
-as described in the \fBmathfunc\fR manual page; the API described on
-this page is not expected to be maintained indefinitely.
-.SH SYNOPSIS
-.nf
-\fB#include <tcl.h>\fR
-.sp
-void
-\fBTcl_CreateMathFunc\fR(\fIinterp, name, numArgs, argTypes, proc, clientData\fR)
-.sp
-int
-\fBTcl_GetMathFuncInfo\fR(\fIinterp, name, numArgsPtr, argTypesPtr, procPtr,
-                    clientDataPtr\fR)
-.sp
-Tcl_Obj *
-\fBTcl_ListMathFuncs\fR(\fIinterp, pattern\fR)
-.SH ARGUMENTS
-.AS Tcl_ValueType *clientDataPtr out
-.AP Tcl_Interp *interp in
-Interpreter in which new function will be defined.
-.AP "const char" *name in
-Name for new function.
-.AP int numArgs in
-Number of arguments to new function;  also gives size of \fIargTypes\fR array.
-.AP Tcl_ValueType *argTypes in
-Points to an array giving the permissible types for each argument to
-function.
-.AP Tcl_MathProc *proc in
-Procedure that implements the function.
-.AP ClientData clientData in
-Arbitrary one-word value to pass to \fIproc\fR when it is invoked.
-.AP int *numArgsPtr out
-Points to a variable that will be set to contain the number of
-arguments to the function.
-.AP 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 function which
-will need to be freed up using \fITcl_Free\fR.
-.AP Tcl_MathProc **procPtr out
-Points to a variable that will be set to contain a pointer to the
-implementation code for the function (or NULL if the function is
-implemented directly in bytecode).
-.AP ClientData *clientDataPtr out
-Points to a variable that will be set to contain the clientData
-argument passed to \fITcl_CreateMathFunc\fR when the function was
-created if the function is not implemented directly in bytecode.
-.AP "const char" *pattern in
-Pattern to match against function names so as to filter them (by
-passing to \fITcl_StringMatch\fR), or NULL to not apply any filter.
-.BE
-.SH DESCRIPTION
-.PP
-Tcl allows a number of mathematical functions to be used in
-expressions, such as \fBsin\fR, \fBcos\fR, and \fBhypot\fR.
-These functions are represented by commands in the namespace,
-\fBtcl::mathfunc\fR.  The \fBTcl_CreateMathFunc\fR function is
-an obsolete way for applications to add additional functions
-to those already provided by Tcl or to replace existing functions.
-It should not be used by new applications, which should create
-math functions using \fBTcl_CreateObjCommand\fR to create a command
-in the \fBtcl::mathfunc\fR namespace.
-.PP
-In the \fBTcl_CreateMathFunc\fR interface,
-\fIName\fR is the name of the function as it will appear in expressions.
-If \fIname\fR does not already exist in the \fB::tcl::mathfunc\fR
-namespace, then a new command is created in that namespace.
-If \fIname\fR does exist, then the existing function is replaced.
-\fINumArgs\fR and \fIargTypes\fR describe the arguments to the function.
-Each entry in the \fIargTypes\fR array must be
-one of \fBTCL_INT\fR, \fBTCL_DOUBLE\fR, \fBTCL_WIDE_INT\fR,
-or \fBTCL_EITHER\fR to indicate whether the corresponding argument must be an
-integer, a double-precision floating value, a wide (64-bit) integer,
-or any, respectively.
-.PP
-Whenever the function is invoked in an expression Tcl will invoke
-\fIproc\fR.  \fIProc\fR should have arguments and result that match
-the type \fBTcl_MathProc\fR:
-.PP
-.CS
-typedef int \fBTcl_MathProc\fR(
-        ClientData \fIclientData\fR,
-        Tcl_Interp *\fIinterp\fR,
-        Tcl_Value *\fIargs\fR,
-        Tcl_Value *\fIresultPtr\fR);
-.CE
-.PP
-When \fIproc\fR is invoked the \fIclientData\fR and \fIinterp\fR
-arguments will be the same as those passed to \fBTcl_CreateMathFunc\fR.
-\fIArgs\fR will point to an array of \fInumArgs\fR Tcl_Value structures,
-which describe the actual arguments to the function:
-.PP
-.CS
-typedef struct Tcl_Value {
-    Tcl_ValueType \fItype\fR;
-    long \fIintValue\fR;
-    double \fIdoubleValue\fR;
-    Tcl_WideInt \fIwideValue\fR;
-} \fBTcl_Value\fR;
-.CE
-.PP
-The \fItype\fR field indicates the type of the argument and is
-one of \fBTCL_INT\fR, \fBTCL_DOUBLE\fR or \fBTCL_WIDE_INT\fR.
-It will match the \fIargTypes\fR value specified for the function unless
-the \fIargTypes\fR value was \fBTCL_EITHER\fR. Tcl converts
-the argument supplied in the expression to the type requested in
-\fIargTypes\fR, if that is necessary.
-Depending on the value of the \fItype\fR field, the \fIintValue\fR,
-\fIdoubleValue\fR or \fIwideValue\fR
-field will contain the actual value of the argument.
-.PP
-\fIProc\fR should compute its result and store it either as an integer
-in \fIresultPtr->intValue\fR or as a floating value in
-\fIresultPtr->doubleValue\fR.
-It should set also \fIresultPtr->type\fR to one of
-\fBTCL_INT\fR, \fBTCL_DOUBLE\fR or \fBTCL_WIDE_INT\fR
-to indicate which value was set.
-Under normal circumstances \fIproc\fR should return \fBTCL_OK\fR.
-If an error occurs while executing the function, \fIproc\fR should
-return \fBTCL_ERROR\fR and leave an error message in the interpreter's result.
-.PP
-\fBTcl_GetMathFuncInfo\fR retrieves the values associated with
-function \fIname\fR that were passed to a preceding
-\fBTcl_CreateMathFunc\fR call.  Normally, the return code is
-\fBTCL_OK\fR but if the named function does not exist, \fBTCL_ERROR\fR
-is returned and an error message is placed in the interpreter's
-result.
-.PP
-If an error did not occur, the array reference placed in the variable
-pointed to by \fIargTypesPtr\fR is newly allocated, and should be
-released by passing it to \fBTcl_Free\fR.  Some functions (the
-standard set implemented in the core, and those defined by placing
-commands in the \fBtcl::mathfunc\fR namespace) do not have
-argument type information; attempting to retrieve values for
-them causes a NULL to be stored in the variable pointed to by
-\fIprocPtr\fR and the variable pointed to by \fIclientDataPtr\fR
-will not be modified.  The variable pointed to by \fInumArgsPointer\fR
-will contain -1, and no argument types will be stored in the variable
-pointed to by \fIargTypesPointer\fR.
-.PP
-\fBTcl_ListMathFuncs\fR returns a Tcl value containing a list of all
-the math functions defined in the interpreter whose name matches
-\fIpattern\fR.  The returned value has a reference count of zero.
-.SH "SEE ALSO"
-expr(n), info(n), Tcl_CreateObjCommand(3), Tcl_Free(3), Tcl_NewListObj(3)
-.SH KEYWORDS
-expression, mathematical function