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Difference between revisions of "cpp/numeric/ratio/ratio greater"

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< cpp‎ | numeric‎ | ratio
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{{cpp/title | ratio_greater}}
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{{cpp/title|ratio_greater}}
 
{{cpp/numeric/ratio/navbar}}
 
{{cpp/numeric/ratio/navbar}}
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{{dcl begin}}
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{{ddcl|header=ratio|since=c++11|1=
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{{dcl header | ratio}}
+
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{{dcl | since=c++11 | 1=
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template< class R1, class R2 >
 
template< class R1, class R2 >
 
struct ratio_greater : std::integral_constant<bool, /* see below */> { };
 
struct ratio_greater : std::integral_constant<bool, /* see below */> { };
 
}}
 
}}
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{{dcl end}}
 
  
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If the ratio {{tt|R1}} is greater than than the ratio {{tt|R2}}, provides the member constant {{tt|value}} equal {{c|true}}. Otherwise, {{tt|value}} is {{c|false}}.
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If the ratio {{tt|R1}} is greater than the ratio {{tt|R2}}, provides the member constant {{c|value}} equal {{c|true}}. Otherwise, {{c|value}} is {{c|false}}.
  
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=== Helper variable template ===
+
===Helper variable template===
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{{ddcl | since=c++17 | 1=
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{{ddcl|since=c++17|1=
 
template< class R1, class R2 >
 
template< class R1, class R2 >
−
inline constexpr bool ratio_greater_v = ratio_greater<R1, R2>::value;
+
constexpr bool ratio_greater_v = ratio_greater<R1, R2>::value;
 
}}
 
}}
  
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{{cpp/types/integral_constant/inherit | {{c|1=R1::num * R2::den > R2::num * R1::den}}, or equivalent expression that avoids overflow }}
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{{cpp/types/integral_constant/inherit|{{c|1=R1::num * R2::den > R2::num * R1::den}}, or equivalent expression that avoids overflow}}
  
 
===Example===
 
===Example===
−
{{example |
+
{{example
−
| code=
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|code=
−
| output=
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#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
 
}}
 
}}
  
 
===See also===
 
===See also===
 
{{dsc begin}}
 
{{dsc begin}}
 +
{{dsc inc|cpp/numeric/ratio/dsc ratio greater_equal}}
 
{{dsc end}}
 
{{dsc end}}
  
 
{{langlinks|de|es|fr|it|ja|pt|ru|zh}}
 
{{langlinks|de|es|fr|it|ja|pt|ru|zh}}

Latest revision as of 15:06, 24 September 2024

 
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Compile-time rational arithmetic
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ratio_greater
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(C++11)
 
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.

Contents

[edit] Helper variable template

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

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>

[edit] Example

Run this code
#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

[edit] See also

(C++11)
 compares two ratio objects for greater than or equal to at compile-time
(class template) [edit]
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