javolution37.javolution.io

Class Union

java.lang.Object

javolution37.javolution.io.Struct

javolution37.javolution.io.Union

public abstract class Union
extends Struct

This class represents a C/C++ union; it works in the same way as Struct (sub-class) except that all members are mapped to the same location in memory.

Here is an example of C union:

     union Number {
         int   asInt;
         float asFloat;
         char  asString[12];
     };

And its Java equivalent:

     public class Number extends Union {
         Signed32   asInt    = new Signed32();
         Float32    asFloat  = new Float32();
         Utf8String asString = new Utf8String(12);
     }

As for any Struct, fields are directly accessible:

     Number num = new Number();
     num.asInt.set(23);
     num.asString.set("23"); // Null terminated (C compatible)
     float f = num.asFloat.get();

Nested Class Summary

Nested classes/interfaces inherited from class javolution37.javolution.io.Struct

Struct.Bool, Struct.Enum16, Struct.Enum32, Struct.Enum64, Struct.Enum8, Struct.Float32, Struct.Float64, Struct.Reference32<S extends Struct>, Struct.Reference64<S extends Struct>, Struct.Signed16, Struct.Signed32, Struct.Signed64, Struct.Signed8, Struct.Unsigned16, Struct.Unsigned32, Struct.Unsigned8, Struct.Utf8String

Constructor Summary

Constructors

Constructor and Description
Union() Default constructor.

Method Summary

Modifier and Type	Method and Description
boolean	isUnion() Returns true.

Methods inherited from class javolution37.javolution.io.Struct

address, byteOrder, getByteBuffer, getByteBufferPosition, isPacked, read, setByteBuffer, setByteBufferPosition, size, toString, write

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

Union

public Union()

Default constructor.

Method Detail

isUnion

public final boolean isUnion()

Returns true.

Overrides:

isUnion in class Struct

Returns:

true

See Also:

Union