Namespaces
Variants
Views
Actions

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

From cppreference.com
< cpp‎ | numeric‎ | ratio
m (typo in equiv fn)
m (-`inline`: CWG2387; fmt.)
 
(15 intermediate revisions by 7 users not shown)
Line 1: Line 1:
−
{{cpp/title | ratio_not_equal}}
+
{{cpp/title|ratio_not_equal}}
−
{{cpp/numeric/ratio/sidebar}}
+
{{cpp/numeric/ratio/navbar}}
−
{{ddcl list begin}}
+
{{ddcl|header=ratio|since=c++11|1=
−
{{ddcl list header | ratio}}
+
−
{{ddcl list item | 1=
+
 
template< class R1, class R2 >
 
template< class R1, class R2 >
−
struct ratio_not_equal : std::integral_constant;
+
struct ratio_not_equal : std::integral_constant<bool, /* see below */> { };
 
}}
 
}}
−
{{ddcl list end}}
 
  
−
If the ratios R1 and R2 are not equal, provides the member constant {{tt|value}} equal {{cpp|true}}. Otherwise, {{tt|value}} is {{cpp|false}}.
+
If the ratios {{tt|R1}} and {{tt|R2}} are not equal, provides the member constant {{c|value}} equal {{c|true}}. Otherwise, {{c|value}} is {{c|false}}.
  
−
{{cpp/types/integral_constant/inherit | {{cpp|1=R1::num != R2::num {{!!}} R1::den != R2::den}} }}
+
===Helper variable template===
 +
{{ddcl|since=c++17|1=
 +
template< class R1, class R2 >
 +
constexpr bool ratio_not_equal_v = ratio_not_equal<R1, R2>::value;
 +
}}
 +
 
 +
{{cpp/types/integral_constant/inherit|{{c|1=R1::num != R2::num {{!!}} R1::den != R2::den}}}}
  
−
===Equivalent definition===
+
===Possible implementation===
−
{{eq fun cpp
+
{{eq fun
−
| 1=
+
|1=
 
template< class R1, class R2 >
 
template< class R1, class R2 >
 
struct ratio_not_equal : std::integral_constant <
 
struct ratio_not_equal : std::integral_constant <
Line 24: Line 27:
  
 
===Example===
 
===Example===
−
{{example cpp
+
{{example
−
|
+
|code=
−
| code=
+
−
#include <iostream>
+
 
#include <ratio>
 
#include <ratio>
−
int main()
+
 
−
{
+
static_assert(std::ratio_not_equal_v<std::ratio<6, 9>, std::ratio<9, 6>>, "6/9 != 9/6");
−
    if(std::ratio_not_equal<std::ratio<2,3>, std::ratio<1,3>>::value)
+
 
−
        std::cout << "2/3 != 1/3\n";
+
int main() {}
−
    else
+
−
        std::cout << "2/3 == 1/3\n";
+
−
}
+
−
| output=
+
−
2/3 != 1/3
+
 
}}
 
}}
 +
 +
===See also===
 +
{{dsc begin}}
 +
{{dsc inc|cpp/numeric/ratio/dsc ratio_equal}}
 +
{{dsc end}}
 +
 +
{{langlinks|de|es|fr|it|ja|pt|ru|zh}}

Latest revision as of 14:42, 24 September 2024

 
C++
 
Metaprogramming library
Type traits
Type categories
(C++11)
(C++14)  
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)  
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
Type properties
(C++11)
(C++11)
(C++11)
(C++11)
(C++14)
(C++11)
(C++17)
(C++23)
(C++11)
(C++11)
(C++11)
(C++11)(until C++20*)
(C++11)(deprecated in C++20)
(C++11)
(C++11)
(C++20)
(C++20)
(C++23)
(C++17)
Type trait constants
(C++11)(C++17)(C++11)(C++11)
Metafunctions
(C++17)
(C++17)
(C++17)
Supported operations
Relationships and property queries
Type modifications
(C++11)(C++11)(C++11)
(C++11)(C++11)(C++11)
(C++11)
(C++11)
Type transformations
(C++11)(deprecated in C++23)
(C++11)(deprecated in C++23)
(C++11)
(C++20)
(C++11)
(C++17)

(C++11)
(C++11)
(C++20)
(C++11)
(C++11)(until C++20*)(C++17)
(C++20)
Compile-time rational arithmetic
Compile-time integer sequences
(C++14)
 
Compile time rational arithmetic
(C++11)
Arithmetic
(C++11)
(C++11)
(C++11)
(C++11)
Comparison
(C++11)
ratio_not_equal
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
 
Defined in header <ratio>
template< class R1, class R2 >
struct ratio_not_equal : std::integral_constant<bool, /* see below */> { };
 (since C++11)

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

Contents

[edit] Helper variable template

template< class R1, class R2 >
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>

[edit] Possible implementation

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

[edit] Example

Run this code
#include <ratio>
 
static_assert(std::ratio_not_equal_v<std::ratio<6, 9>, std::ratio<9, 6>>, "6/9 != 9/6");
 
int main() {}

[edit] See also

(C++11)
 compares two ratio objects for equality at compile-time
(class template) [edit]
Retrieved from "https://en.cppreference.com/mwiki/index.php?title=cpp/numeric/ratio/ratio_not_equal&oldid=176481"