The std::ratio_greater
class template provides a mechanism for comparing two std::ratio values at compile time,
using rational arithmetic.
template <class R1, class R2> class ratio_greater: public see below {};
R1 and R2
must be instantiations of the std::ratio class template.
The value of std::ratio_greater<R1,R2>
is std::ratio_less<R2,R1>::value
If the TR1 std::tr1::integral_constant class template is available,
then std::ratio_greater<R1,R2> derives from std::tr1::integral_constant<bool, value >. Otherwise, std::ratio_greater<R1,R2>
derives from an internal type that provides a static constant data member
value of type bool equal to value.
#include <ratio>