2010-08-06  Paolo Carlini  <paolo.carlini@oracle.com>

	* include/std/ratio (ratio_less): Improve, use ratio_divide to avoid
	more overflows.
	* testsuite/20_util/ratio/comparisons/comp1.cc: Extend.
	* testsuite/20_util/ratio/comparisons/comp2.cc: Likewise.

From-SVN: r162941