W3cubDocs

/C++

std::ratio_greater

Defined in header `<ratio>`
template< class R1, class R2 > struct ratio_greater : std::integral_constant<bool, /* see below */> { };		(since C++11)

If the ratio R1 is greater than the ratio R2, provides the member constant value equal true. Otherwise, value is false.

Helper variable template

template< class R1, class R2 >
inline constexpr bool ratio_greater_v = ratio_greater<R1, R2>::value;

(since C++17)

Inherited from std::integral_constant

Member constants

value

[static]

true if R1::num * R2::den > R2::num * R1::den, or equivalent expression that avoids overflow, false otherwise
(public static member constant)

Member functions

operator bool	converts the object to bool, returns `value` (public member function)
operator() (C++14)	returns `value` (public member function)

Member types

Type	Definition
`value_type`	bool
`type`	std::integral_constant<bool, value>

Example

#include <iostream>
#include <ratio>
 
int main()
{
    static_assert(std::ratio_greater<std::ratio<3, 4>, std::ratio<1, 2>>::value,
                  "3/4 > 1/2");
 
    if (std::ratio_greater<std::ratio<11, 12>, std::ratio<10, 11>>::value)
        std::cout << "11/12 > 10/11" "\n";
 
    // Since C++17
    static_assert(std::ratio_greater_v<std::ratio<12, 13>, std::ratio<11, 12>>);
 
    if constexpr (std::ratio_greater_v<std::ratio<12, 13>, std::ratio<11, 12>>)
        std::cout << "12/13 > 11/12" "\n";
}

Output:

11/12 > 10/11
12/13 > 11/12