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| 9 | '\" |
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| 245 | .. |
| 246 | .TH Tcl_ExprLong 3 7.0 Tcl "Tcl Library Procedures" |
| 247 | .BS |
| 248 | .SH NAME |
| 249 | Tcl_ExprLong, Tcl_ExprDouble, Tcl_ExprBoolean, Tcl_ExprString \- evaluate an expression |
| 250 | .SH SYNOPSIS |
| 251 | .nf |
| 252 | \fB#include <tcl.h>\fR |
| 253 | .sp |
| 254 | int |
| 255 | \fBTcl_ExprLong\fR(\fIinterp, string, longPtr\fR) |
| 256 | .sp |
| 257 | int |
| 258 | \fBTcl_ExprDouble\fR(\fIinterp, string, doublePtr\fR) |
| 259 | .sp |
| 260 | int |
| 261 | \fBTcl_ExprBoolean\fR(\fIinterp, string, booleanPtr\fR) |
| 262 | .sp |
| 263 | int |
| 264 | \fBTcl_ExprString\fR(\fIinterp, string\fR) |
| 265 | .SH ARGUMENTS |
| 266 | .AS Tcl_Interp *booleanPtr |
| 267 | .AP Tcl_Interp *interp in |
| 268 | Interpreter in whose context to evaluate \fIstring\fR. |
| 269 | .VS 8.4 |
| 270 | .AP "CONST char" *string in |
| 271 | .VE |
| 272 | Expression to be evaluated. |
| 273 | .AP long *longPtr out |
| 274 | Pointer to location in which to store the integer value of the |
| 275 | expression. |
| 276 | .AP int *doublePtr out |
| 277 | Pointer to location in which to store the floating-point value of the |
| 278 | expression. |
| 279 | .AP int *booleanPtr out |
| 280 | Pointer to location in which to store the 0/1 boolean value of the |
| 281 | expression. |
| 282 | .BE |
| 283 | |
| 284 | .SH DESCRIPTION |
| 285 | .PP |
| 286 | These four procedures all evaluate the expression |
| 287 | given by the \fIstring\fR argument |
| 288 | and return the result in one of four different forms. |
| 289 | The expression can have any of the forms accepted by the \fBexpr\fR command. |
| 290 | Note that these procedures have been largely replaced by the |
| 291 | object-based procedures \fBTcl_ExprLongObj\fR, \fBTcl_ExprDoubleObj\fR, |
| 292 | \fBTcl_ExprBooleanObj\fR, and \fBTcl_ExprObj\fR. |
| 293 | Those object-based procedures evaluate an expression held in a Tcl object |
| 294 | instead of a string. |
| 295 | The object argument can retain an internal representation |
| 296 | that is more efficient to execute. |
| 297 | .PP |
| 298 | The \fIinterp\fR argument refers to an interpreter used to |
| 299 | evaluate the expression (e.g. for variables and nested Tcl |
| 300 | commands) and to return error information. |
| 301 | .PP |
| 302 | For all of these procedures the return value is a standard |
| 303 | Tcl result: \fBTCL_OK\fR means the expression was successfully |
| 304 | evaluated, and \fBTCL_ERROR\fR means that an error occurred while |
| 305 | evaluating the expression. |
| 306 | If \fBTCL_ERROR\fR is returned then |
| 307 | the interpreter's result will hold a message describing the error. |
| 308 | If an error occurs while executing a Tcl command embedded in |
| 309 | the expression then that error will be returned. |
| 310 | .PP |
| 311 | If the expression is successfully evaluated, then its value is |
| 312 | returned in one of four forms, depending on which procedure |
| 313 | is invoked. |
| 314 | \fBTcl_ExprLong\fR stores an integer value at \fI*longPtr\fR. |
| 315 | If the expression's actual value is a floating-point number, |
| 316 | then it is truncated to an integer. |
| 317 | If the expression's actual value is a non-numeric string then |
| 318 | an error is returned. |
| 319 | .PP |
| 320 | \fBTcl_ExprDouble\fR stores a floating-point value at \fI*doublePtr\fR. |
| 321 | If the expression's actual value is an integer, it is converted to |
| 322 | floating-point. |
| 323 | If the expression's actual value is a non-numeric string then |
| 324 | an error is returned. |
| 325 | .PP |
| 326 | \fBTcl_ExprBoolean\fR stores a 0/1 integer value at \fI*booleanPtr\fR. |
| 327 | If the expression's actual value is an integer or floating-point |
| 328 | number, then they store 0 at \fI*booleanPtr\fR if |
| 329 | the value was zero and 1 otherwise. |
| 330 | If the expression's actual value is a non-numeric string then |
| 331 | it must be one of the values accepted by \fBTcl_GetBoolean\fR |
| 332 | such as ``yes'' or ``no'', or else an error occurs. |
| 333 | .PP |
| 334 | \fBTcl_ExprString\fR returns the value of the expression as a |
| 335 | string stored in the interpreter's result. |
| 336 | |
| 337 | .SH "SEE ALSO" |
| 338 | Tcl_ExprLongObj, Tcl_ExprDoubleObj, Tcl_ExprBooleanObj, Tcl_ExprObj |
| 339 | |
| 340 | .SH KEYWORDS |
| 341 | boolean, double, evaluate, expression, integer, object, string |