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2 | '\" Copyright (c) 1989-1993 The Regents of the University of California. | |
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9 | '\" | |
10 | '\" The definitions below are for supplemental macros used in Tcl/Tk | |
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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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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) |