Tcl_DoubleObj(3) Tcl Library Procedures Tcl_DoubleObj(3) 







Tcl_NewDoubleObj, Tcl_SetDoubleObj, Tcl_GetDoubleFromObj -
    manipulate Tcl objects as floating-point values








#include <tcl.h>

Tcl_Obj *
Tcl_NewDoubleObj(doubleValue)

Tcl_SetDoubleObj(objPtr, doubleValue)

int
Tcl_GetDoubleFromObj(interp, objPtr, doublePtr)









  
double doubleValue (in)

  
A double-precision floating-point value used to initialize or set a Tcl
      object.

  
Tcl_Obj *objPtr (in/out)

  
For Tcl_SetDoubleObj, this points to the object in which to store a
      double value. For Tcl_GetDoubleFromObj, this refers to the object
      from which to retrieve a double value.

  
Tcl_Interp *interp (in/out)

  
When non-NULL, an error message is left here when double value retrieval
      fails.

  
double *doublePtr (out)

  
Points to place to store the double value obtained from objPtr.
    
    

    

  










These procedures are used to create, modify, and read Tcl objects
    that hold double-precision floating-point values.


Tcl_NewDoubleObj creates and returns a new Tcl object
    initialized to the double value doubleValue. The returned Tcl object
    is unshared.


Tcl_SetDoubleObj sets the value of an existing Tcl object
    pointed to by objPtr to the double value doubleValue. The
    objPtr argument must point to an unshared Tcl object. Any attempt to
    set the value of a shared Tcl object violates Tcl's copy-on-write policy.
    Any existing string representation or internal representation in the
    unshared Tcl object will be freed as a consequence of setting the new
  value.


Tcl_GetDoubleFromObj attempts to retrieve a double value
    from the Tcl object objPtr. If the attempt succeeds, then
    TCL_OK is returned, and the double value is written to the storage
    pointed to by doublePtr. If the attempt fails, then TCL_ERROR
    is returned, and if interp is non-NULL, an error message is left in
    interp. The Tcl_ObjType of objPtr may be changed to
    make subsequent calls to Tcl_GetDoubleFromObj more efficient.








Tcl_NewObj, Tcl_DecrRefCount, Tcl_IncrRefCount,
  Tcl_GetObjResult








double, double object, double type, internal representation,
    object, object type, string representation







  

    8.0
    Tcl