std::ratio_greater_equal

 

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Compile-time rational arithmetic
Compile-time integer sequences
integer_sequence (C++14)

 

Compile time rational arithmetic

ratio (C++11)

Arithmetic

ratio_add (C++11)

ratio_subtract (C++11)

ratio_multiply (C++11)

ratio_divide (C++11)

Comparison

ratio_equal (C++11)

ratio_not_equal (C++11)

ratio_less (C++11)

ratio_less_equal (C++11)

ratio_greater (C++11)

ratio_greater_equal (C++11)

 

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

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

Helper variable template

template< class R1, class R2 > constexpr bool ratio_greater_equal_v = ratio_greater_equal<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

Run this code

#include <iostream>
#include <ratio>
 
int main()
{
    static_assert(std::ratio_greater_equal<
        std::ratio<2, 3>,
        std::ratio<2, 3>>::value, "2/3 >= 2/3");
 
    if (std::ratio_greater_equal<
        std::ratio<2,1>, std::ratio<1, 2>>::value)
        std::cout << "2/1 >= 1/2" "\n";
 
    if (std::ratio_greater_equal<
        std::ratio<1,2>, std::ratio<1, 2>>::value)
        std::cout << "1/2 >= 1/2" "\n";
 
    // Since C++17
    static_assert(std::ratio_greater_equal_v<
        std::ratio<999'999, 1'000'000>,  //'
        std::ratio<999'998, 999'999>> ); //'
 
    if constexpr (std::ratio_greater_equal_v<
        std::ratio<999'999, 1'000'000>,  //'
        std::ratio<999'998, 999'999>>)   //'
        std::cout << "999'999/1'000'000 >= 999'998/999'999" "\n";
 
    if constexpr (std::ratio_greater_equal_v<
        std::ratio<999'999, 1'000'000>,  //'
        std::ratio<999'999, 1'000'000>>) //'
        std::cout << "999'999/1'000'000 >= 999'999/1'000'000" "\n";
}

Output:

2/1 >= 1/2
1/2 >= 1/2
999'999/1'000'000 >= 999'998/999'999
999'999/1'000'000 >= 999'999/1'000'000

See also

ratio_equal (C++11)	compares two ratio objects for equality at compile-time (class template)
ratio_less (C++11)	compares two ratio objects for less than at compile-time (class template)