
// double

module std.typeinfo.ti_double;

private import std.math;

class TypeInfo_d : TypeInfo
{
    override string toString() { return "double"; }

    override hash_t getHash(in void *p)
    {
	return (cast(uint *)p)[0] + (cast(uint *)p)[1];
    }

    static bool _equals(double f1, double f2)
    {
	return f1 == f2 ||
		(isnan(f1) && isnan(f2));
    }

    static int _compare(double d1, double d2)
    {
	if (d1 !<>= d2)		// if either are NaN
	{
	    if (isnan(d1))
	    {	if (isnan(d2))
		    return 0;
		return -1;
	    }
	    return 1;
	}
	return (d1 == d2) ? 0 : ((d1 < d2) ? -1 : 1);
    }

    override bool equals(in void *p1, in void *p2)
    {
	return _equals(*cast(double *)p1, *cast(double *)p2);
    }

    override int compare(in void *p1, in void *p2)
    {
	return _compare(*cast(double *)p1, *cast(double *)p2);
    }

    override size_t tsize()
    {
	return double.sizeof;
    }

    override void swap(void *p1, void *p2)
    {
	double t;

	t = *cast(double *)p1;
	*cast(double *)p1 = *cast(double *)p2;
	*cast(double *)p2 = t;
    }

    override void[] init()
    {	static double r;

	return (cast(double *)&r)[0 .. 1];
    }
}

