@JRubyMethod(name = "round", compat = CompatVersion.RUBY1_9)
public IRubyObject round19(ThreadContext context, IRubyObject arg) {
int ndigits = RubyNumeric.num2int(arg);
if (ndigits > 0) return RubyKernel.new_float(this, this);
if (ndigits == 0) return this;
ndigits = -ndigits;
Ruby runtime = context.getRuntime();
if (ndigits < 0) throw runtime.newArgumentError("ndigits out of range");
IRubyObject f = Numeric.int_pow(context, 10, ndigits);
if (this instanceof RubyFixnum && f instanceof RubyFixnum) {
long x = ((RubyFixnum) this).getLongValue();
long y = ((RubyFixnum) f).getLongValue();
boolean neg = x < 0;
if (neg) x = -x;
x = (x + y / 2) / y * y;
if (neg) x = -x;
return RubyFixnum.newFixnum(runtime, x);
} else {
IRubyObject h = f.callMethod(context, "/", RubyFixnum.two(runtime));
IRubyObject r = callMethod(context, "%", f);
IRubyObject n = callMethod(context, "-", r);
if (!r.callMethod(context, "<", h).isTrue()) n = n.callMethod(context, "+", f);
return n;
}
}
@JRubyMethod(name = "round", compat = CompatVersion.RUBY1_9)
public IRubyObject round19(ThreadContext context, IRubyObject arg) {
int ndigits = RubyNumeric.num2int(arg);
if (ndigits > 0) return RubyKernel.new_float(this, this);
if (ndigits == 0) return this;
Ruby runtime = context.runtime;
long bytes = (this instanceof RubyFixnum) ? 8 : RubyFixnum.fix2long(callMethod("size"));
/* If 10**N/2 > this, return 0 */
/* We have log_256(10) > 0.415241 and log_256(1/2)=-0.125 */
if (-0.415241 * ndigits - 0.125 > bytes) {
return RubyFixnum.zero(runtime);
}
IRubyObject f = Numeric.int_pow(context, 10, -ndigits);
if (this instanceof RubyFixnum && f instanceof RubyFixnum) {
long x = ((RubyFixnum) this).getLongValue();
long y = ((RubyFixnum) f).getLongValue();
boolean neg = x < 0;
if (neg) x = -x;
x = (x + y / 2) / y * y;
if (neg) x = -x;
return RubyFixnum.newFixnum(runtime, x);
} else if (f instanceof RubyFloat) {
return RubyFixnum.zero(runtime);
} else {
IRubyObject h = f.callMethod(context, "/", RubyFixnum.two(runtime));
IRubyObject r = callMethod(context, "%", f);
IRubyObject n = callMethod(context, "-", r);
String op = callMethod(context, "<", RubyFixnum.zero(runtime)).isTrue() ? "<=" : "<";
if (!r.callMethod(context, op, h).isTrue()) n = n.callMethod(context, "+", f);
return n;
}
}