[OpenSPARC-T2-SAM] / sam-t2 / devtools / v9 / man / man3 / Tcl_ExprDoubleObj.3

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.TH Tcl_ExprLongObj 3 8.0 Tcl "Tcl Library Procedures"
.BS
.SH NAME
Tcl_ExprLongObj, Tcl_ExprDoubleObj, Tcl_ExprBooleanObj, Tcl_ExprObj \- evaluate an expression
.SH SYNOPSIS
.nf
\fB#include <tcl.h>\fR
.sp
int
\fBTcl_ExprLongObj\fR(\fIinterp, objPtr, longPtr\fR)
.sp
int
\fBTcl_ExprDoubleObj\fR(\fIinterp, objPtr, doublePtr\fR)
.sp
int
\fBTcl_ExprBooleanObj\fR(\fIinterp, objPtr, booleanPtr\fR)
.sp
int
\fBTcl_ExprObj\fR(\fIinterp, objPtr, resultPtrPtr\fR)
.SH ARGUMENTS
.AS Tcl_Interp **resultPtrPtr out
.AP Tcl_Interp *interp in
Interpreter in whose context to evaluate \fIobjPtr\fR.
.AP Tcl_Obj *objPtr in
Pointer to an object containing the expression to evaluate.
.AP long *longPtr out
Pointer to location in which to store the integer value of the
expression.
.AP int *doublePtr out
Pointer to location in which to store the floating-point value of the
expression.
.AP int *booleanPtr out
Pointer to location in which to store the 0/1 boolean value of the
expression.
.AP Tcl_Obj **resultPtrPtr out
Pointer to location in which to store a pointer to the object
that is the result of the expression.
.BE

.SH DESCRIPTION
.PP
These four procedures all evaluate an expression, returning
the result in one of four different forms.
The expression is given by the \fIobjPtr\fR argument, and it
can have any of the forms accepted by the \fBexpr\fR command.
.PP
The \fIinterp\fR argument refers to an interpreter used to
evaluate the expression (e.g. for variables and nested Tcl
commands) and to return error information.
.PP
For all of these procedures the return value is a standard
Tcl result: \fBTCL_OK\fR means the expression was successfully
evaluated, and \fBTCL_ERROR\fR means that an error occurred while
evaluating the expression.
If \fBTCL_ERROR\fR is returned,
then a message describing the error
can be retrieved using \fBTcl_GetObjResult\fR.
If an error occurs while executing a Tcl command embedded in
the expression then that error will be returned.
.PP
If the expression is successfully evaluated, then its value is
returned in one of four forms, depending on which procedure
is invoked.
\fBTcl_ExprLongObj\fR stores an integer value at \fI*longPtr\fR.
If the expression's actual value is a floating-point number,
then it is truncated to an integer.
If the expression's actual value is a non-numeric string then
an error is returned.
.PP
\fBTcl_ExprDoubleObj\fR stores a floating-point value at \fI*doublePtr\fR.
If the expression's actual value is an integer, it is converted to
floating-point.
If the expression's actual value is a non-numeric string then
an error is returned.
.PP
\fBTcl_ExprBooleanObj\fR stores a 0/1 integer value at \fI*booleanPtr\fR.
If the expression's actual value is an integer or floating-point
number, then they store 0 at \fI*booleanPtr\fR if
the value was zero and 1 otherwise.
If the expression's actual value is a non-numeric string then
it must be one of the values accepted by \fBTcl_GetBoolean\fR
such as ``yes'' or ``no'', or else an error occurs.
.PP
If \fBTcl_ExprObj\fR successfully evaluates the expression,
it stores a pointer to the Tcl object
containing the expression's value at \fI*resultPtrPtr\fR.
In this case, the caller is responsible for calling
\fBTcl_DecrRefCount\fR to decrement the object's reference count
when it is finished with the object.

.SH "SEE ALSO"
Tcl_ExprLong, Tcl_ExprDouble, Tcl_ExprBoolean, Tcl_ExprString, Tcl_GetObjResult

.SH KEYWORDS
boolean, double, evaluate, expression, integer, object, string
Commit	Line	Data
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	5	'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
	6	'\"
	7	'\" RCS: @(#) $Id: ExprLongObj.3,v 1.3.12.1 2005/05/03 17:53:41 dgp Exp $
	8	'\"
	9	'\" The definitions below are for supplemental macros used in Tcl/Tk
	10	'\" manual entries.
	11	'\"
	12	'\" .AP type name in/out ?indent?
	13	'\" Start paragraph describing an argument to a library procedure.
	14	'\" type is type of argument (int, etc.), in/out is either "in", "out",
	15	'\" or "in/out" to describe whether procedure reads or modifies arg,
	16	'\" and indent is equivalent to second arg of .IP (shouldn't ever be
	17	'\" needed; use .AS below instead)
	18	'\"
	19	'\" .AS ?type? ?name?
	20	'\" Give maximum sizes of arguments for setting tab stops. Type and
	21	'\" name are examples of largest possible arguments that will be passed
	22	'\" to .AP later. If args are omitted, default tab stops are used.
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	55	'\" options follow on successive lines, in four columns separated
	56	'\" by tabs.
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	60	'\"
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	62	'\" Start of description of a specific option. cmdName gives the
	63	'\" option's name as specified in the class command, dbName gives
	64	'\" the option's name in the option database, and dbClass gives
65	'\" the option's class in the option database.
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73	.if t .wh -1.3i ^B
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244	..
245	.TH Tcl_ExprLongObj 3 8.0 Tcl "Tcl Library Procedures"
246	.BS
247	.SH NAME
248	Tcl_ExprLongObj, Tcl_ExprDoubleObj, Tcl_ExprBooleanObj, Tcl_ExprObj \- evaluate an expression
249	.SH SYNOPSIS
250	.nf
251	\fB#include <tcl.h>\fR
252	.sp
253	int
254	\fBTcl_ExprLongObj\fR(\fIinterp, objPtr, longPtr\fR)
255	.sp
256	int
257	\fBTcl_ExprDoubleObj\fR(\fIinterp, objPtr, doublePtr\fR)
258	.sp
259	int
260	\fBTcl_ExprBooleanObj\fR(\fIinterp, objPtr, booleanPtr\fR)
261	.sp
262	int
263	\fBTcl_ExprObj\fR(\fIinterp, objPtr, resultPtrPtr\fR)
264	.SH ARGUMENTS
265	.AS Tcl_Interp **resultPtrPtr out
266	.AP Tcl_Interp *interp in
267	Interpreter in whose context to evaluate \fIobjPtr\fR.
268	.AP Tcl_Obj *objPtr in
269	Pointer to an object containing the expression to evaluate.
270	.AP long *longPtr out
271	Pointer to location in which to store the integer value of the
272	expression.
273	.AP int *doublePtr out
274	Pointer to location in which to store the floating-point value of the
275	expression.
276	.AP int *booleanPtr out
277	Pointer to location in which to store the 0/1 boolean value of the
278	expression.
279	.AP Tcl_Obj **resultPtrPtr out
280	Pointer to location in which to store a pointer to the object
281	that is the result of the expression.
282	.BE
283
284	.SH DESCRIPTION
285	.PP
286	These four procedures all evaluate an expression, returning
287	the result in one of four different forms.
288	The expression is given by the \fIobjPtr\fR argument, and it
289	can have any of the forms accepted by the \fBexpr\fR command.
290	.PP
291	The \fIinterp\fR argument refers to an interpreter used to
292	evaluate the expression (e.g. for variables and nested Tcl
293	commands) and to return error information.
294	.PP
295	For all of these procedures the return value is a standard
296	Tcl result: \fBTCL_OK\fR means the expression was successfully
297	evaluated, and \fBTCL_ERROR\fR means that an error occurred while
298	evaluating the expression.
299	If \fBTCL_ERROR\fR is returned,
300	then a message describing the error
301	can be retrieved using \fBTcl_GetObjResult\fR.
302	If an error occurs while executing a Tcl command embedded in
303	the expression then that error will be returned.
304	.PP
305	If the expression is successfully evaluated, then its value is
306	returned in one of four forms, depending on which procedure
307	is invoked.
308	\fBTcl_ExprLongObj\fR stores an integer value at \fI*longPtr\fR.
309	If the expression's actual value is a floating-point number,
310	then it is truncated to an integer.
311	If the expression's actual value is a non-numeric string then
312	an error is returned.
313	.PP
314	\fBTcl_ExprDoubleObj\fR stores a floating-point value at \fI*doublePtr\fR.
315	If the expression's actual value is an integer, it is converted to
316	floating-point.
317	If the expression's actual value is a non-numeric string then
318	an error is returned.
319	.PP
320	\fBTcl_ExprBooleanObj\fR stores a 0/1 integer value at \fI*booleanPtr\fR.
321	If the expression's actual value is an integer or floating-point
322	number, then they store 0 at \fI*booleanPtr\fR if
323	the value was zero and 1 otherwise.
324	If the expression's actual value is a non-numeric string then
325	it must be one of the values accepted by \fBTcl_GetBoolean\fR
326	such as ``yes'' or ``no'', or else an error occurs.
327	.PP
328	If \fBTcl_ExprObj\fR successfully evaluates the expression,
329	it stores a pointer to the Tcl object
330	containing the expression's value at \fI*resultPtrPtr\fR.
331	In this case, the caller is responsible for calling
332	\fBTcl_DecrRefCount\fR to decrement the object's reference count
333	when it is finished with the object.
334
335	.SH "SEE ALSO"
336	Tcl_ExprLong, Tcl_ExprDouble, Tcl_ExprBoolean, Tcl_ExprString, Tcl_GetObjResult
337
338	.SH KEYWORDS
339	boolean, double, evaluate, expression, integer, object, string