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Tcl_ExprLongObj(3)		      Tcl Library Procedures		       Tcl_ExprLongObj(3)

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NAME
       Tcl_ExprLongObj,  Tcl_ExprDoubleObj, Tcl_ExprBooleanObj, Tcl_ExprObj - evaluate an expres-
       sion

SYNOPSIS
       #include <tcl.h>

       int
       Tcl_ExprLongObj(interp, objPtr, longPtr)

       int
       Tcl_ExprDoubleObj(interp, objPtr, doublePtr)

       int
       Tcl_ExprBooleanObj(interp, objPtr, booleanPtr)

       int
       Tcl_ExprObj(interp, objPtr, resultPtrPtr)

ARGUMENTS
       Tcl_Interp *interp (in)		       Interpreter in whose context to evaluate objPtr.

       Tcl_Obj *objPtr (in)		       Pointer to an object containing the expression  to
					       evaluate.

       long *longPtr (out)		       Pointer	to location in which to store the integer
					       value of the expression.

       int *doublePtr (out)		       Pointer to location in which to store  the  float-
					       ing-point value of the expression.

       int *booleanPtr (out)		       Pointer	to  location  in  which  to store the 0/1
					       boolean value of the expression.

       Tcl_Obj **resultPtrPtr (out)	       Pointer to location in which to store a pointer to
					       the object that is the result of the expression.
_________________________________________________________________

DESCRIPTION
       These four procedures all evaluate an expression, returning the result in one of four dif-
       ferent forms.  The expression is given by the objPtr argument, and it can have any of  the
       forms accepted by the expr command.

       The  interp  argument  refers  to an interpreter used to evaluate the expression (e.g. for
       variables and nested Tcl commands) and to return error information.

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

       If the expression is successfully evaluated, then its value is returned	in  one  of  four
       forms,  depending  on which procedure is invoked.  Tcl_ExprLongObj stores an integer value
       at *longPtr.  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.

       Tcl_ExprDoubleObj stores a floating-point value at *doublePtr.  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.

       Tcl_ExprBooleanObj stores a 0/1 integer value at *booleanPtr.  If the expression's  actual
       value  is  an  integer  or  floating-point number, then they store 0 at *booleanPtr 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 Tcl_GetBoolean such as "yes" or "no", or
       else an error occurs.

       If Tcl_ExprObj successfully evaluates the expression, it  stores  a  pointer  to  the  Tcl
       object  containing  the	expression's value at *resultPtrPtr.  In this case, the caller is
       responsible for calling Tcl_DecrRefCount to decrement the object's reference count when it
       is finished with the object.

SEE ALSO
       Tcl_ExprLong, Tcl_ExprDouble, Tcl_ExprBoolean, Tcl_ExprString, Tcl_GetObjResult

KEYWORDS
       boolean, double, evaluate, expression, integer, object, string

Tcl					       8.0			       Tcl_ExprLongObj(3)
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