# std::ratio_equal

< cpp‎ | numeric‎ | ratio

C++
 Sprache Concepts Utilities-Bibliothek Strings Bibliothek Container-Bibliothek Algorithmen-Bibliothek Iteratoren Bibliothek Numerik-Bibliothek Input / Output-Bibliothek Lokalisierungen Bibliothek Reguläre Ausdrücke Bibliothek (C++11) Atomare Operationen Bibliothek (C++11) Thread Support-Bibliothek (C++11)

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
 partial_sum

Compile-Zeit rationale Arithmetik
 ratio (C++11)
Arithmetik
Original:
Arithmetic
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 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)

 Defined in header 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 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (public static Mitglied konstanten)

### Member functions

 operator bool wandelt das Objekt bool, gibt `value` Original: converts the object to bool, returns `value` The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (öffentliche Elementfunktion)

### Member types

 Type Original: Type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. Definition `value_type` `bool` `type` std::integral_constant

### [Bearbeiten]Mögliche Implementierung

 ```template< class R1, class R2 > struct ratio_equal : public std::integral_constant < bool, R1::num == R2::num && R1::den == R2::den > {};```

### [Bearbeiten]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`