Interface Callback

All Superinterfaces:
FunctionPointer
Functional Interface:
This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.
@FunctionalInterface @Generated("org.javagi.JavaGI") public interface Callback extends FunctionPointer

Functional interface declaration of the Callback callback.

See Also:

  • Method Summary

    Modifier and Type
    Method
    Description
    void
    run()
    The type used for callback functions in structure definitions and function signatures.
    default MemorySegment
    toCallback(Arena arena)
    Creates a native function pointer to the upcall() method.
    default void
    upcall()
    The upcall method is called from native code.

  • Method Details

    • run

      void run()

      The type used for callback functions in structure definitions and function signatures.

      This doesn't mean that all callback functions must take no parameters and return void. The required signature of a callback function is determined by the context in which is used (e.g. the signal to which it is connected).

      Use G_CALLBACK() to cast the callback function to a GCallback.

    • upcall

      default void upcall()
      The upcall method is called from native code. The parameters are marshaled and run() is executed.

    • toCallback

      default MemorySegment toCallback(Arena arena)
      Creates a native function pointer to the upcall() method.
      Specified by:
      toCallback in interface FunctionPointer
      Parameters:
      arena - the arena in which the function pointer is allocated
      Returns:
      the native function pointer