Compile-time rational arithmetic

ratio arithmetic

ratio_add (C++11)	adds two ratio objects (class template)
ratio_subtract (C++11)	subtracts two ratio objects (class template)
ratio_multiply (C++11)	multiplies two ratio objects (class template)
ratio_divide (C++11)	divides two ratio objects (class template)

ratio comparison

ratio_equal (C++11)	compares two ratio objects for equality (class template)
ratio_not_equal (C++11)	compares two ratio objects for inequality (class template)
ratio_less (C++11)	compares two ratio objects for less than (class template)
ratio_less_equal (C++11)	compares two ratio objects for less than or equal to (class template)
ratio_greater (C++11)	compares two ratio objects for greater than (class template)
ratio_greater_equal (C++11)	compares two ratio objects for greater than or equal to (class template)

Convenience SI typedefs

typedef std::ratio<1, 1000000000000000000000000> yocto; //see below typedef std::ratio<1, 1000000000000000000000> zepto;    //see below typedef std::ratio<1, 1000000000000000000> atto; typedef std::ratio<1, 1000000000000000> femto; typedef std::ratio<1, 1000000000000> pico; typedef std::ratio<1, 1000000000> nano; typedef std::ratio<1, 1000000> micro; typedef std::ratio<1, 1000> milli; typedef std::ratio<1, 100> centi; typedef std::ratio<1, 10> deci; typedef std::ratio<10, 1> deca; typedef std::ratio<100, 1> hecto; typedef std::ratio<1000, 1> kilo; typedef std::ratio<1000000, 1> mega; typedef std::ratio<1000000000, 1> giga; typedef std::ratio<1000000000000, 1> tera; typedef std::ratio<1000000000000000, 1> peta; typedef std::ratio<1000000000000000000, 1> exa; typedef std::ratio<1000000000000000000000, 1> zetta;    //see below typedef std::ratio<1000000000000000000000000, 1> yotta; //see below		Template:mark c++11 feature