+2001-10-19 Mark Wielaard <mark@klomp.org>
+
+ * java/lang/Double.java: More Classpath merging
+ (isInfinite): Don't use doubleToLongBits
+ (isNaN (Object)): return v != v
+ (initIDs): make native
+ * java/lang/Float.java: Ditto
+ (isInfinite): Don't use floatToIntBits
+ (isNaN (Object)): return v != v
+ * java/lang/natDouble.cc: add empty initIDs()
+
2001-10-19 Mark Wielaard <mark@klomp.org>
* javax/naming/BinaryRefAddr.java: New file
* <code>instanceof</code> <code>Double</code>, and represents
* the same primitive <code>double</code> value return
* <code>true</code>. Otherwise <code>false</code> is returned.
+ * <p>
+ * Note that there are two differences between <code>==</code> and
+ * <code>equals()</code>. <code>0.0d == -0.0d</code> returns <code>true</code>
+ * but <code>new Double(0.0d).equals(new Double(-0.0d))</code> returns
+ * <code>false</code>. And <code>Double.NaN == Double.NaN</code> returns
+ * <code>false</code>, but
+ * <code>new Double(Double.NaN).equals(new Double(Double.NaN))</code> returns
+ * <code>true</code>.
*
* @param obj the object to compare to
* @return whether the objects are semantically equal.
*/
public static boolean isNaN (double v)
{
- long bits = doubleToLongBits (v);
- long e = bits & 0x7ff0000000000000L;
- long f = bits & 0x000fffffffffffffL;
-
- return e == 0x7ff0000000000000L && f != 0L;
+ // This works since NaN != NaN is the only reflexive inequality
+ // comparison which returns true.
+ return v != v;
}
/**
*/
public static boolean isInfinite (double v)
{
- long bits = doubleToLongBits (v);
- long f = bits & 0x7fffffffffffffffL;
-
- return f == 0x7ff0000000000000L;
+ return (v == POSITIVE_INFINITY || v == NEGATIVE_INFINITY);
}
/**
* Initialize JNI cache. This method is called only by the
* static initializer when using JNI.
*/
- private static void initIDs () { /* Not used in libgcj */ };
+ private static native void initIDs ();
}
* <code>instanceof</code> <code>Float</code>, and represents
* the same primitive <code>float</code> value return
* <code>true</code>. Otherwise <code>false</code> is returned.
+ * <p>
+ * Note that there are two differences between <code>==</code> and
+ * <code>equals()</code>. <code>0.0f == -0.0f</code> returns <code>true</code>
+ * but <code>new Float(0.0f).equals(new Float(-0.0f))</code> returns
+ * <code>false</code>. And <code>Float.NaN == Float.NaN</code> returns
+ * <code>false</code>, but
+ * <code>new Float(Float.NaN).equals(new Float(Float.NaN))</code> returns
+ * <code>true</code>.
*
* @param obj the object to compare to
* @return whether the objects are semantically equal.
*/
public static boolean isNaN (float v)
{
- int bits = floatToIntBits (v);
- int e = bits & 0x7f800000;
- int f = bits & 0x007fffff;
-
- return e == 0x7f800000 && f != 0;
+ // This works since NaN != NaN is the only reflexive inequality
+ // comparison which returns true.
+ return v != v;
}
/**
*/
public static boolean isInfinite (float v)
{
- int bits = floatToIntBits (v);
- int f = bits & 0x7fffffff;
-
- return f == 0x7f800000;
+ return (v == POSITIVE_INFINITY || v == NEGATIVE_INFINITY);
}
/**
}
throw new NumberFormatException;
}
+
+void
+java::lang::Double::initIDs()
+{
+ // Not used in libgcj
+}