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NAME
     Tcl_NewBooleanObj, Tcl_SetBooleanObj,  Tcl_GetBooleanFromObj
     - manipulate Tcl objects as boolean values

SYNOPSIS
     #include <tcl.h>

     Tcl_Obj *
     Tcl_NewBooleanObj(boolValue)

     Tcl_SetBooleanObj(objPtr, boolValue)

     int
     Tcl_GetBooleanFromObj(interp, objPtr, boolPtr)

ARGUMENTS
     int          boolValue (in)      Integer value used to  ini-
                                      tialize  or  set  a boolean
                                      object.  If the integer  is
                                      nonzero, the boolean object
                                      is set to 1; otherwise  the
                                      boolean object is set to 0.

     Tcl_Obj      *objPtr   (in/out)  For Tcl_SetBooleanObj, this
                                      points  to the object to be
                                      converted to boolean  type.
                                      For  Tcl_GetBooleanFromObj,
                                      this refers to  the  object
                                      from which to get a boolean
                                      value; if objPtr  does  not
                                      already  point to a boolean
                                      object, an attempt will  be
                                      made to convert it to one.

     Tcl_Interp   *interp   (in/out)  If an error  occurs  during
                                      conversion,  an  error mes-
                                      sage   is   left   in   the
                                      interpreter's result object
                                      unless interp is NULL.

     int          *boolPtr  (out)     Points   to   place   where
                                      Tcl_GetBooleanFromObj
                                      stores the boolean value (0
                                      or 1) obtained from objPtr.
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DESCRIPTION
     These procedures  are  used  to  create,  modify,  and  read
     boolean  Tcl  objects  from  C  code.  Tcl_NewBooleanObj and
     Tcl_SetBooleanObj will create a new object of  boolean  type
     or  modify  an existing object to have boolean type. Both of
     these procedures set the object to have the boolean value (0
     or  1)  specified by boolValue; if boolValue is nonzero, the
     object is set  to  1,  otherwise  to  0.   Tcl_NewBooleanObj
     returns  a  pointer to a newly created object with reference
     count zero.  Both procedures set the  object's  type  to  be
     boolean  and assign the boolean value to the object's inter-
     nal  representation  longValue  member.    Tcl_SetBooleanObj
     invalidates any old string representation and, if the object
     is not already a boolean  object,  frees  any  old  internal
     representation.

     Tcl_GetBooleanFromObj attempts to  return  a  boolean  value
     from  the Tcl object objPtr.  If the object is not already a
     boolean 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, Tcl_GetBooleanFromObj
     returns TCL_OK and stores the boolean value in  the  address
     given  by  boolPtr.   If the object is not already a boolean
     object, the conversion will free any old internal  represen-
     tation.


SEE ALSO
     Tcl_NewObj,       Tcl_DecrRefCount,        Tcl_IncrRefCount,
     Tcl_GetObjResult


KEYWORDS
     boolean, boolean object, boolean type, internal  representa-
     tion, object, object type, string representation

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