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Difference between revisions of "cpp/numeric/ratio/ratio not equal"

From cppreference.com
< cpp‎ | numeric‎ | ratio
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{{dcl header | ratio}}
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template< class R1, class R2 >
 
template< class R1, class R2 >
 
struct ratio_not_equal : std::integral_constant;
 
struct ratio_not_equal : std::integral_constant;

Revision as of 01:02, 23 August 2018

 
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ratio_not_equal
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Defined in header <ratio>
template< class R1, class R2 >
struct ratio_not_equal : std::integral_constant;
 (since C++11)

If the ratios R1 and R2 are not equal, provides the member constant value equal true. Otherwise, value is false.

Contents

Helper variable template

template< class R1, class R2 >
inline constexpr bool ratio_not_equal_v = ratio_not_equal<R1, R2>::value;
 (since C++17)
[edit]

Inherited from std::integral_constant

Member constants

value
[static]
 true if R1::num != R2::num || R1::den != R2::den , 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>

Possible implementation

template< class R1, class R2 >
struct ratio_not_equal : std::integral_constant <
                              bool,
                              !std::ratio_equal<R1, R2>
                         > {};

Example

Run this code
#include <iostream>
#include <ratio>
 
int main()
{
    if(std::ratio_not_equal<std::ratio<2,3>, std::ratio<1,3>>::value) {
        std::cout << "2/3 != 1/3\n";
    } else {
        std::cout << "2/3 == 1/3\n";
    }
}

Output: 

2/3 != 1/3

See also

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