| 1 | '\" |
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| 9 | '\" |
| 10 | '\" The definitions below are for supplemental macros used in Tcl/Tk |
| 11 | '\" manual entries. |
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| 71 | '\" RCS: @(#) $Id: man.macros,v 1.4 2000/08/25 06:18:32 ericm Exp $ |
| 72 | '\" |
| 73 | '\" # Set up traps and other miscellaneous stuff for Tcl/Tk man pages. |
| 74 | .if t .wh -1.3i ^B |
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| 77 | '\" # Start an argument description |
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| 206 | '\" # SO - start of list of standard options |
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| 208 | .SH "STANDARD OPTIONS" |
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| 219 | See the \\fBoptions\\fR manual entry for details on the standard options. |
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| 226 | Command-Line Name: \\fB\\$1\\fR |
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| 245 | .. |
| 246 | .TH Tcl_CreateMathFunc 3 8.4 Tcl "Tcl Library Procedures" |
| 247 | .BS |
| 248 | .SH NAME |
| 249 | Tcl_CreateMathFunc, Tcl_GetMathFuncInfo, Tcl_ListMathFuncs \- Define, query and enumerate math functions for expressions |
| 250 | .SH SYNOPSIS |
| 251 | .nf |
| 252 | \fB#include <tcl.h>\fR |
| 253 | .sp |
| 254 | void |
| 255 | \fBTcl_CreateMathFunc\fR(\fIinterp, name, numArgs, argTypes, proc, clientData\fR) |
| 256 | .sp |
| 257 | .VS 8.4 |
| 258 | int |
| 259 | \fBTcl_GetMathFuncInfo\fR(\fIinterp, name, numArgsPtr, argTypesPtr, procPtr, clientDataPtr\fR) |
| 260 | .sp |
| 261 | Tcl_Obj * |
| 262 | \fBTcl_ListMathFuncs\fR(\fIinterp, pattern\fR) |
| 263 | .VE |
| 264 | .SH ARGUMENTS |
| 265 | .AS Tcl_ValueType *clientDataPtr |
| 266 | .AP Tcl_Interp *interp in |
| 267 | Interpreter in which new function will be defined. |
| 268 | .VS 8.4 |
| 269 | .AP "CONST char" *name in |
| 270 | .VE |
| 271 | Name for new function. |
| 272 | .AP int numArgs in |
| 273 | Number of arguments to new function; also gives size of \fIargTypes\fR array. |
| 274 | .AP Tcl_ValueType *argTypes in |
| 275 | Points to an array giving the permissible types for each argument to |
| 276 | function. |
| 277 | .AP Tcl_MathProc *proc in |
| 278 | Procedure that implements the function. |
| 279 | .AP ClientData clientData in |
| 280 | Arbitrary one-word value to pass to \fIproc\fR when it is invoked. |
| 281 | .AP int *numArgsPtr out |
| 282 | Points to a variable that will be set to contain the number of |
| 283 | arguments to the function. |
| 284 | .AP Tcl_ValueType **argTypesPtr out |
| 285 | Points to a variable that will be set to contain a pointer to an array |
| 286 | giving the permissible types for each argument to the function which |
| 287 | will need to be freed up using \fITcl_Free\fR. |
| 288 | .AP Tcl_MathProc **procPtr out |
| 289 | Points to a variable that will be set to contain a pointer to the |
| 290 | implementation code for the function (or NULL if the function is |
| 291 | implemented directly in bytecode.) |
| 292 | .AP ClientData *clientDataPtr out |
| 293 | Points to a variable that will be set to contain the clientData |
| 294 | argument passed to \fITcl_CreateMathFunc\fR when the function was |
| 295 | created if the function is not implemented directly in bytecode. |
| 296 | .AP "CONST char" *pattern in |
| 297 | Pattern to match against function names so as to filter them (by |
| 298 | passing to \fITcl_StringMatch\fR), or NULL to not apply any filter. |
| 299 | .BE |
| 300 | |
| 301 | .SH DESCRIPTION |
| 302 | .PP |
| 303 | Tcl allows a number of mathematical functions to be used in |
| 304 | expressions, such as \fBsin\fR, \fBcos\fR, and \fBhypot\fR. |
| 305 | \fBTcl_CreateMathFunc\fR allows applications to add additional functions |
| 306 | to those already provided by Tcl or to replace existing functions. |
| 307 | \fIName\fR is the name of the function as it will appear in expressions. |
| 308 | If \fIname\fR doesn't already exist as a function then a new function |
| 309 | is created. If it does exist, then the existing function is replaced. |
| 310 | \fINumArgs\fR and \fIargTypes\fR describe the arguments to the function. |
| 311 | Each entry in the \fIargTypes\fR array must be |
| 312 | .VS 8.4 |
| 313 | one of TCL_INT, TCL_DOUBLE, TCL_WIDE_INT, |
| 314 | or TCL_EITHER to indicate whether the corresponding argument must be an |
| 315 | integer, a double-precision floating value, a wide (64-bit) integer, |
| 316 | or any, respectively. |
| 317 | .VE 8.4 |
| 318 | .PP |
| 319 | Whenever the function is invoked in an expression Tcl will invoke |
| 320 | \fIproc\fR. \fIProc\fR should have arguments and result that match |
| 321 | the type \fBTcl_MathProc\fR: |
| 322 | .CS |
| 323 | typedef int Tcl_MathProc( |
| 324 | ClientData \fIclientData\fR, |
| 325 | Tcl_Interp *\fIinterp\fR, |
| 326 | Tcl_Value *\fIargs\fR, |
| 327 | Tcl_Value *\fIresultPtr\fR); |
| 328 | .CE |
| 329 | .PP |
| 330 | When \fIproc\fR is invoked the \fIclientData\fR and \fIinterp\fR |
| 331 | arguments will be the same as those passed to \fBTcl_CreateMathFunc\fR. |
| 332 | \fIArgs\fR will point to an array of \fInumArgs\fR Tcl_Value structures, |
| 333 | which describe the actual arguments to the function: |
| 334 | .VS 8.4 |
| 335 | .CS |
| 336 | typedef struct Tcl_Value { |
| 337 | Tcl_ValueType \fItype\fR; |
| 338 | long \fIintValue\fR; |
| 339 | double \fIdoubleValue\fR; |
| 340 | Tcl_WideInt \fIwideValue\fR; |
| 341 | } Tcl_Value; |
| 342 | .CE |
| 343 | .PP |
| 344 | The \fItype\fR field indicates the type of the argument and is |
| 345 | one of TCL_INT, TCL_DOUBLE or TCL_WIDE_INT. |
| 346 | .VE 8.4 |
| 347 | It will match the \fIargTypes\fR value specified for the function unless |
| 348 | the \fIargTypes\fR value was TCL_EITHER. Tcl converts |
| 349 | the argument supplied in the expression to the type requested in |
| 350 | \fIargTypes\fR, if that is necessary. |
| 351 | Depending on the value of the \fItype\fR field, the \fIintValue\fR, |
| 352 | .VS 8.4 |
| 353 | \fIdoubleValue\fR or \fIwideValue\fR |
| 354 | .VE 8.4 |
| 355 | field will contain the actual value of the argument. |
| 356 | .PP |
| 357 | \fIProc\fR should compute its result and store it either as an integer |
| 358 | in \fIresultPtr->intValue\fR or as a floating value in |
| 359 | \fIresultPtr->doubleValue\fR. |
| 360 | It should set also \fIresultPtr->type\fR to one of |
| 361 | .VS 8.4 |
| 362 | TCL_INT, TCL_DOUBLE or TCL_WIDE_INT |
| 363 | .VE 8.4 |
| 364 | to indicate which value was set. |
| 365 | Under normal circumstances \fIproc\fR should return TCL_OK. |
| 366 | If an error occurs while executing the function, \fIproc\fR should |
| 367 | return TCL_ERROR and leave an error message in the interpreter's result. |
| 368 | .PP |
| 369 | .VS 8.4 |
| 370 | \fBTcl_GetMathFuncInfo\fR retrieves the values associated with |
| 371 | function \fIname\fR that were passed to a preceding |
| 372 | \fBTcl_CreateMathFunc\fR call. Normally, the return code is |
| 373 | \fBTCL_OK\fR but if the named function does not exist, \fBTCL_ERROR\fR |
| 374 | is returned and an error message is placed in the interpreter's |
| 375 | result. |
| 376 | .PP |
| 377 | If an error did not occur, the array reference placed in the variable |
| 378 | pointed to by \fIargTypesPtr\fR is newly allocated, and should be |
| 379 | released by passing it to \fBTcl_Free\fR. Some functions (the |
| 380 | standard set implemented in the core) are implemented directly at the |
| 381 | bytecode level; attempting to retrieve values for them causes a NULL |
| 382 | to be stored in the variable pointed to by \fIprocPtr\fR and the |
| 383 | variable pointed to by \fIclientDataPtr\fR will not be modified. |
| 384 | .PP |
| 385 | \fBTcl_ListMathFuncs\fR returns a Tcl object containing a list of all |
| 386 | the math functions defined in the interpreter whose name matches |
| 387 | \fIpattern\fR. In the case of an error, NULL is returned and an error |
| 388 | message is left in the interpreter result, and otherwise the returned |
| 389 | object will have a reference count of zero. |
| 390 | .VE |
| 391 | |
| 392 | .SH KEYWORDS |
| 393 | expression, mathematical function |
| 394 | |
| 395 | .SH "SEE ALSO" |
| 396 | expr(n), info(n), Tcl_Free(3), Tcl_NewListObj(3) |