{"id":7435,"date":"2022-12-20T19:38:05","date_gmt":"2022-12-20T22:38:05","guid":{"rendered":"http:\/\/lode.uno\/linux-man\/index.php\/2022\/12\/20\/tcl_exprlongobj-man3-3\/"},"modified":"2022-12-20T19:38:05","modified_gmt":"2022-12-20T22:38:05","slug":"tcl_exprlongobj-man3-3","status":"publish","type":"post","link":"https:\/\/lode.uno\/linux-man\/2022\/12\/20\/tcl_exprlongobj-man3-3\/","title":{"rendered":"Tcl_ExprLongObj (man3)"},"content":{"rendered":"

Tcl_ExprLongObj<\/h1>\n

NAME<\/a>
SYNOPSIS<\/a>
ARGUMENTS<\/a>
DESCRIPTION<\/a>
SEE ALSO<\/a>
KEYWORDS<\/a> <\/p>\n

\n

______________________________________________________________________________<\/p>\n

NAME <\/a> <\/h2>\n

Tcl_ExprLongObj, Tcl_ExprDoubleObj, Tcl_ExprBooleanObj, Tcl_ExprObj \u2212 evaluate an expression<\/p>\n

SYNOPSIS <\/a> <\/h2>\n

#include <\/b><\/p>\n

int
Tcl_ExprLongObj<\/b>(interp, objPtr, longPtr<\/i>)<\/p>\n

int
Tcl_ExprDoubleObj<\/b>(interp, objPtr, doublePtr<\/i>)<\/p>\n

int
Tcl_ExprBooleanObj<\/b>(interp, objPtr, booleanPtr<\/i>)<\/p>\n

int
Tcl_ExprObj<\/b>(interp, objPtr, resultPtrPtr<\/i>)<\/p>\n

ARGUMENTS <\/a> <\/h2>\n\n\n\n\n\n\n\n
<\/td>\n\n

Tcl_Interp *interp<\/i> (in)<\/p>\n<\/td>\n

<\/td>\n\n

Interpreter in whose context to evaluate objPtr<\/i>.<\/p>\n<\/td>\n<\/tr>\n

<\/td>\n\n

Tcl_Obj *objPtr<\/i> (in)<\/p>\n<\/td>\n

<\/td>\n\n

Pointer to a value containing the expression to evaluate.<\/p>\n<\/td>\n<\/tr>\n

<\/td>\n\n

long *longPtr<\/i> (out)<\/p>\n<\/td>\n

<\/td>\n\n

Pointer to location in which to store the integer value of the expression.<\/p>\n<\/td>\n<\/tr>\n

<\/td>\n\n

int *doublePtr<\/i> (out)<\/p>\n<\/td>\n

<\/td>\n\n

Pointer to location in which to store the floating-point value of the expression.<\/p>\n<\/td>\n<\/tr>\n

<\/td>\n\n

int *booleanPtr<\/i> (out)<\/p>\n<\/td>\n

<\/td>\n\n

Pointer to location in which to store the 0\/1 boolean value of the expression.<\/p>\n<\/td>\n<\/tr>\n

<\/td>\n\n

Tcl_Obj **resultPtrPtr<\/i> (out)<\/p>\n<\/td>\n

<\/td>\n\n

Pointer to location in which to store a pointer to the value that is the result of the expression.<\/p>\n<\/td>\n<\/tr>\n<\/table>\n

______________________________________________________________________________<\/p>\n

DESCRIPTION <\/a> <\/h2>\n

These four procedures all evaluate an expression, returning the result in one of four different forms. The expression is given by the objPtr<\/i> argument, and it can have any of the forms accepted by the expr<\/b> command.<\/p>\n

The interp<\/i> argument refers to an interpreter used to evaluate the expression (e.g. for variables and nested Tcl commands) and to return error information.<\/p>\n

For all of these procedures the return value is a standard Tcl result: TCL_OK<\/b> means the expression was successfully evaluated, and TCL_ERROR<\/b> means that an error occurred while evaluating the expression. If TCL_ERROR<\/b> is returned, then a message describing the error can be retrieved using Tcl_GetObjResult<\/b>. If an error occurs while executing a Tcl command embedded in the expression then that error will be returned.<\/p>\n

If the expression is successfully evaluated, then its value is returned in one of four forms, depending on which procedure is invoked. Tcl_ExprLongObj<\/b> stores an integer value at *longPtr<\/i>. If the expression\u2019s actual value is a floating-point number, then it is truncated to an integer. If the expression\u2019s actual value is a non-numeric string then an error is returned.<\/p>\n

Tcl_ExprDoubleObj<\/b> stores a floating-point value at *doublePtr<\/i>. If the expression\u2019s actual value is an integer, it is converted to floating-point. If the expression\u2019s actual value is a non-numeric string then an error is returned.<\/p>\n

Tcl_ExprBooleanObj<\/b> stores a 0\/1 integer value at *booleanPtr<\/i>. If the expression\u2019s actual value is an integer or floating-point number, then they store 0 at *booleanPtr<\/i> if the value was zero and 1 otherwise. If the expression\u2019s actual value is a non-numeric string then it must be one of the values accepted by Tcl_GetBoolean<\/b> such as \u201cyes\u201d or \u201cno\u201d, or else an error occurs.<\/p>\n

If Tcl_ExprObj<\/b> successfully evaluates the expression, it stores a pointer to the Tcl value containing the expression\u2019s value at *resultPtrPtr<\/i>. In this case, the caller is responsible for calling Tcl_DecrRefCount<\/b> to decrement the value\u2019s reference count when it is finished with the value.<\/p>\n

SEE ALSO <\/a> <\/h2>\n

Tcl_ExprLong, Tcl_ExprDouble, Tcl_ExprBoolean, Tcl_ExprString, Tcl_GetObjResult<\/p>\n

KEYWORDS <\/a> <\/h2>\n

boolean, double, evaluate, expression, integer, value, string<\/p>\n

\n","protected":false},"excerpt":{"rendered":"

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