open_control

Any I/O class with a constructor that takes an os_open_t parameter can be constructed to either access an existing object in the system or create a new object. A parameter of this type accepts either an os_open_control object or a bitwise-OR of the following flags.

• create_new -Create the object; then open it. If the object already exists, raise an exception.
• create_always -Create the object if it does not already exist; then open it. If the object already exists, truncate its length to 0 .
• open_existing -Open the object if it already exists; otherwise, raise an exception.
• open_always -Create the object if it does not already exist; then open it.
• truncate_existing -Open the existing object, but truncate its length to 0 .

#include <ospace/io/openctrl.h>

class os_open_control

enum os_open_control::type_t
  {
  create_new,
  create_always,
  open_existing,
  open_always,
  truncate_existing
  };
  

#include <ospace/uss/io.h>

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