Interface MDBCmpFuncI

  • All Superinterfaces:
    CallbackI, CallbackI.I, Pointer
    All Known Implementing Classes:
    MDBCmpFunc
    Functional Interface:
    This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

    @FunctionalInterface
    public interface MDBCmpFuncI
    extends CallbackI.I

    Type

    
     int (*) (
         MDB_val const *a,
         MDB_val const *b
     )
    • Method Detail

      • getSignature

        default java.lang.String getSignature()
        Description copied from interface: CallbackI
        Returns the dyncall signature for this callback function. [INTERNAL API]
        Specified by:
        getSignature in interface CallbackI
        Returns:
        the dyncall signature
      • callback

        default int callback​(long args)
        Description copied from interface: CallbackI.I
        Will be called by native code.
        Specified by:
        callback in interface CallbackI.I
        Parameters:
        args - pointer to a DCArgs iterator
        Returns:
        the value to store to the result DCValue
      • invoke

        int invoke​(long a,
                   long b)
        A callback function used to compare two keys in a database.
        Parameters:
        a - the first item to compare
        b - the second item to compare
        Returns:
        < 0 if a < b, 0 if a == b, > 0 if a > b