DESCRIPTION
These procedures are used to create, modify, and read
double Tcl objects from C code.
Tcl_NewDoubleObj and Tcl_SetDoubleObj
will create a new object of double type
or modify an existing object to have double type.
Both of these procedures set the object to have the
double-precision floating point value given by doubleValue;
Tcl_NewDoubleObj returns a pointer to a newly created object
with reference count zero.
Both procedures set the object's type to be double
and assign the double value to the object's internal representation
doubleValue member.
Tcl_SetDoubleObj invalidates any old string representation
and, if the object is not already a double object,
frees any old internal representation.
Tcl_GetDoubleFromObj attempts to return a double value
from the Tcl object objPtr.
If the object is not already a double object,
it will attempt to convert it to one.
If an error occurs during conversion, it returns TCL_ERROR
and leaves an error message in the interpreter's result object
unless interp is NULL.
Otherwise, it returns TCL_OK and stores the double value
in the address given by doublePtr.
If the object is not already a double object,
the conversion will free any old internal representation.
SEE ALSO
Tcl_NewObj, Tcl_DecrRefCount, Tcl_IncrRefCount, Tcl_GetObjResult
KEYWORDS
double, double object, double type, internal representation, object, object type, string representation
Last change: 8.0
[ tcl8.0b1 | tk8.0b1 | X-ref ]
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Copyright © 1994-1997 Sun Microsystems, Inc.