std::ratio_equal – cppreference.com

std::ratio_equal

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<metanoindex/>

 
C++
 
Numerik-Bibliothek
Gemeinsame mathematischen Funktionen
Floating-Point-Umgebung
Komplexe Zahlen
Numerische Arrays
Pseudo-Zufallszahlen
Compile-time rationale Arithmetik (C++11)
Generische numerische Operationen
Original:
Generic numeric operations
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iota(C++11)
accumulate
inner_product
adjacent_difference
partial_sum
 
Compile-Zeit rationale Arithmetik
ratio(C++11)
Arithmetik
Original:
Arithmetic
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ratio_add(C++11)
ratio_subtract(C++11)
ratio_multiply(C++11)
ratio_divide(C++11)
Vergleich
Original:
Comparison
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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)
 
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definiert in Header <ratio>
template< class R1, class R2 > struct ratio_equal : std::integral_constant;
Wenn die Verhältnisse R1 und R2 gleich sind, bietet das Mitglied konstanten value gleich true. Ansonsten ist value false .
Original:
If the ratios R1 and R2 are equal, provides the member constant value equal true. Otherwise, value is false.
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Inherited from std::integral_constant

Member constants

value
[statisch]
true wenn R1::num == R2::num && R1::den == R2::den , false anders
Original:
true if R1::num == R2::num && R1::den == R2::den , false otherwise
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(public static Mitglied konstanten)

Member functions

operator bool
wandelt das Objekt bool, gibt value
Original:
converts the object to bool, returns value
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(öffentliche Elementfunktion)

Member types

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

Mögliche Implementierung

Beispiel

#include <iostream>
#include <ratio>

int main()
{
    if(std::ratio_equal<std::ratio<2,3>, std::ratio<4,6>>::value) {
        std::cout << "2/3 == 4/6\n";
    } else {
        std::cout << "2/3 != 4/6\n";
    }
}

Output: 

2/3 == 4/6