diff options
Diffstat (limited to 'doc/IntObj.3')
| -rw-r--r-- | doc/IntObj.3 | 172 |
1 files changed, 110 insertions, 62 deletions
diff --git a/doc/IntObj.3 b/doc/IntObj.3 index 6222498..d42b44a 100644 --- a/doc/IntObj.3 +++ b/doc/IntObj.3 @@ -4,13 +4,11 @@ '\" See the file "license.terms" for information on usage and redistribution '\" of this file, and for a DISCLAIMER OF ALL WARRANTIES. '\" -'\" RCS: @(#) $Id: IntObj.3,v 1.2 1998/09/14 18:39:49 stanton Exp $ -'\" +.TH Tcl_IntObj 3 8.5 Tcl "Tcl Library Procedures" .so man.macros -.TH Tcl_IntObj 3 8.0 Tcl "Tcl Library Procedures" .BS .SH NAME -Tcl_NewIntObj, Tcl_NewLongObj, Tcl_SetIntObj, Tcl_SetLongObj, Tcl_GetIntFromObj, Tcl_GetLongFromObj \- manipulate Tcl objects as integers +Tcl_NewIntObj, Tcl_NewLongObj, Tcl_NewWideIntObj, Tcl_SetIntObj, Tcl_SetLongObj, Tcl_SetWideIntObj, Tcl_GetIntFromObj, Tcl_GetLongFromObj, Tcl_GetWideIntFromObj, Tcl_NewBignumObj, Tcl_SetBignumObj, Tcl_GetBignumFromObj, Tcl_TakeBignumFromObj \- manipulate Tcl values as integers .SH SYNOPSIS .nf \fB#include <tcl.h>\fR @@ -21,84 +19,134 @@ Tcl_Obj * Tcl_Obj * \fBTcl_NewLongObj\fR(\fIlongValue\fR) .sp +Tcl_Obj * +\fBTcl_NewWideIntObj\fR(\fIwideValue\fR) +.sp \fBTcl_SetIntObj\fR(\fIobjPtr, intValue\fR) .sp \fBTcl_SetLongObj\fR(\fIobjPtr, longValue\fR) .sp +\fBTcl_SetWideIntObj\fR(\fIobjPtr, wideValue\fR) +.sp int \fBTcl_GetIntFromObj\fR(\fIinterp, objPtr, intPtr\fR) .sp int \fBTcl_GetLongFromObj\fR(\fIinterp, objPtr, longPtr\fR) +.sp +int +\fBTcl_GetWideIntFromObj\fR(\fIinterp, objPtr, widePtr\fR) +.sp +.sp +\fB#include <tclTomMath.h>\fR +.sp +Tcl_Obj * +\fBTcl_NewBignumObj\fR(\fIbigValue\fR) +.sp +\fBTcl_SetBignumObj\fR(\fIobjPtr, bigValue\fR) +.sp +int +\fBTcl_GetBignumFromObj\fR(\fIinterp, objPtr, bigValue\fR) +.sp +int +\fBTcl_TakeBignumFromObj\fR(\fIinterp, objPtr, bigValue\fR) +.sp +int +\fBTcl_InitBignumFromDouble\fR(\fIinterp, doubleValue, bigValue\fR) .SH ARGUMENTS -.AS Tcl_Interp *interp +.AS Tcl_WideInt doubleValue in/out .AP int intValue in -Integer value used to initialize or set an integer object. +Integer value used to initialize or set a Tcl value. .AP long longValue in -Long integer value used to initialize or set an integer object. +Long integer value used to initialize or set a Tcl value. +.AP Tcl_WideInt wideValue in +Wide integer value used to initialize or set a Tcl value. .AP Tcl_Obj *objPtr in/out -For \fBTcl_SetIntObj\fR and \fBTcl_SetLongObj\fR, -this points to the object to be converted to integer type. -For \fBTcl_GetIntFromObj\fR and \fBTcl_GetLongFromObj\fR, -this refers to the object -from which to get an integer or long integer value; -if \fIobjPtr\fR does not already point to an integer object, -an attempt will be made to convert it to one. +For \fBTcl_SetIntObj\fR, \fBTcl_SetLongObj\fR, \fBTcl_SetWideIntObj\fR, +and \fBTcl_SetBignumObj\fR, this points to the value in which to store an +integral value. For \fBTcl_GetIntFromObj\fR, \fBTcl_GetLongFromObj\fR, +\fBTcl_GetWideIntFromObj\fR, \fBTcl_GetBignumFromObj\fR, and +\fBTcl_TakeBignumFromObj\fR, this refers to the value from which +to retrieve an integral value. .AP Tcl_Interp *interp in/out -If an error occurs during conversion, -an error message is left in the interpreter's result object -unless \fIinterp\fR is NULL. +When non-NULL, an error message is left here when integral value +retrieval fails. .AP int *intPtr out -Points to place to store the integer value -obtained by \fBTcl_GetIntFromObj\fR from \fIobjPtr\fR. +Points to place to store the integer value retrieved from \fIobjPtr\fR. .AP long *longPtr out -Points to place to store the long integer value -obtained by \fBTcl_GetLongFromObj\fR from \fIobjPtr\fR. +Points to place to store the long integer value retrieved from \fIobjPtr\fR. +.AP Tcl_WideInt *widePtr out +Points to place to store the wide integer value retrieved from \fIobjPtr\fR. +.AP mp_int *bigValue in/out +Points to a multi-precision integer structure declared by the LibTomMath +library. +.AP double doubleValue in +Double value from which the integer part is determined and +used to initialize a multi-precision integer value. .BE - .SH DESCRIPTION .PP -These procedures are used to create, modify, and read -integer Tcl objects from C code. -\fBTcl_NewIntObj\fR, \fBTcl_NewLongObj\fR, -\fBTcl_SetIntObj\fR, and \fBTcl_SetLongObj\fR -create a new object of integer type -or modify an existing object to have integer type. -\fBTcl_NewIntObj\fR and \fBTcl_SetIntObj\fR set the object to have the -integer value given by \fIintValue\fR, -while \fBTcl_NewLongObj\fR and \fBTcl_SetLongObj\fR -set the object to have the -long integer value given by \fIlongValue\fR. -\fBTcl_NewIntObj\fR and \fBTcl_NewLongObj\fR -return a pointer to a newly created object with reference count zero. -These procedures set the object's type to be integer -and assign the integer value to the object's internal representation -\fIlongValue\fR member. -\fBTcl_SetIntObj\fR and \fBTcl_SetLongObj\fR -invalidate any old string representation and, -if the object is not already an integer object, -free any old internal representation. +These procedures are used to create, modify, and read Tcl values +that hold integral values. +.PP +The different routines exist to accommodate different integral types in C +with which values might be exchanged. The C integral types for which Tcl +provides value exchange routines are \fBint\fR, \fBlong int\fR, +\fBTcl_WideInt\fR, and \fBmp_int\fR. The \fBint\fR and \fBlong int\fR types +are provided by the C language standard. The \fBTcl_WideInt\fR type is a +typedef defined to be whatever signed integral type covers at least the +64-bit integer range (-9223372036854775808 to 9223372036854775807). Depending +on the platform and the C compiler, the actual type might be +\fBlong int\fR, \fBlong long int\fR, \fBint64\fR, or something else. +The \fBmp_int\fR type is a multiple-precision integer type defined +by the LibTomMath multiple-precision integer library. +.PP +The \fBTcl_NewIntObj\fR, \fBTcl_NewLongObj\fR, \fBTcl_NewWideIntObj\fR, +and \fBTcl_NewBignumObj\fR routines each create and return a new +Tcl value initialized to the integral value of the argument. The +returned Tcl value is unshared. +.PP +The \fBTcl_SetIntObj\fR, \fBTcl_SetLongObj\fR, \fBTcl_SetWideIntObj\fR, +and \fBTcl_SetBignumObj\fR routines each set the value of an existing +Tcl value pointed to by \fIobjPtr\fR to the integral value provided +by the other argument. The \fIobjPtr\fR argument must point to an +unshared Tcl value. Any attempt to set the value of a shared Tcl value +violates Tcl's copy-on-write policy. Any existing string representation +or internal representation in the unshared Tcl value will be freed +as a consequence of setting the new value. +.PP +The \fBTcl_GetIntFromObj\fR, \fBTcl_GetLongFromObj\fR, +\fBTcl_GetWideIntFromObj\fR, \fBTcl_GetBignumFromObj\fR, and +\fBTcl_TakeBignumFromObj\fR routines attempt to retrieve an integral +value of the appropriate type from the Tcl value \fIobjPtr\fR. If the +attempt succeeds, then \fBTCL_OK\fR is returned, and the value is +written to the storage provided by the caller. The attempt might +fail if \fIobjPtr\fR does not hold an integral value, or if the +value exceeds the range of the target type. If the attempt fails, +then \fBTCL_ERROR\fR is returned, and if \fIinterp\fR is non-NULL, +an error message is left in \fIinterp\fR. The \fBTcl_ObjType\fR +of \fIobjPtr\fR may be changed to make subsequent calls to the +same routine more efficient. Unlike the other functions, +\fBTcl_TakeBignumFromObj\fR may set the content of the Tcl value +\fIobjPtr\fR to an empty string in the process of retrieving the +multiple-precision integer value. +.PP +The choice between \fBTcl_GetBignumFromObj\fR and +\fBTcl_TakeBignumFromObj\fR is governed by how the caller will +continue to use \fIobjPtr\fR. If after the \fBmp_int\fR value +is retrieved from \fIobjPtr\fR, the caller will make no more +use of \fIobjPtr\fR, then using \fBTcl_TakeBignumFromObj\fR +permits Tcl to detect when an unshared \fIobjPtr\fR permits the +value to be moved instead of copied, which should be more efficient. +If anything later in the caller requires +\fIobjPtr\fR to continue to hold the same value, then +\fBTcl_GetBignumFromObj\fR must be chosen. .PP -\fBTcl_GetIntFromObj\fR and \fBTcl_GetLongFromObj\fR -attempt to return an integer value from the Tcl object \fIobjPtr\fR. -If the object is not already an integer object, -they will attempt to convert it to one. -If an error occurs during conversion, they return \fBTCL_ERROR\fR -and leave an error message in the interpreter's result object -unless \fIinterp\fR is NULL. -Also, if the long integer held in the object's internal representation -\fIlongValue\fR member can not be represented in a (non-long) integer, -\fBTcl_GetIntFromObj\fR returns \fBTCL_ERROR\fR -and leaves an error message in the interpreter's result object -unless \fIinterp\fR is NULL. -Otherwise, both procedures return \fBTCL_OK\fR and -store the integer or the long integer value -in the address given by \fIintPtr\fR and \fIlongPtr\fR respectively. -If the object is not already an integer object, -the conversion will free any old internal representation. - +The \fBTcl_InitBignumFromDouble\fR routine is a utility procedure +that extracts the integer part of \fIdoubleValue\fR and stores that +integer value in the \fBmp_int\fR value \fIbigValue\fR. .SH "SEE ALSO" Tcl_NewObj, Tcl_DecrRefCount, Tcl_IncrRefCount, Tcl_GetObjResult - .SH KEYWORDS -integer, integer object, integer type, internal representation, object, object type, string representation +integer, integer value, integer type, internal representation, value, +value type, string representation |