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std::ratio_multiply

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< cpp‎ | numeric‎ | ratio

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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
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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)
 
definiert in Header <ratio>
template< class R1, class R2 >
using ratio_multiply = /* unspecified */;
Die Vorlage alias std::ratio_multiply bezeichnet das Ergebnis der Multiplikation zweier exakten rationalen Fraktionen von den std::ratio Fällen vertreten R1 und R2. Das Ergebnis eine Instanz std::ratio std::ratio<Num, Denom> wo Num == R1::num * R2::num und Denom == R1::den * R2::den .
Original:
The template alias std::ratio_multiply denotes the result of multiplying two exact rational fractions represented by the std::ratio instances R1 and R2. The result a std::ratio instance std::ratio<Num, Denom> where Num == R1::num * R2::num and Denom == R1::den * R2::den.
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[Bearbeiten] Mitglied Typen

Mitglied Typ
Original:
Member type
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 Definition
type std::ratio<num, den>

[Bearbeiten] Mitglied Konstanten

num
[statisch]
constexpr Wert vom Typ std::intmax_t gleich sign(Num) * sign(Denom) * abs(Num) / gcd(Num, Denom)
Original:
constexpr value of type std::intmax_t equal to sign(Num) * sign(Denom) * abs(Num) / gcd(Num, Denom)
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(public static Mitglied konstanten)
den
[statisch]
constexpr Wert vom Typ std::intmax_t gleich abs(Denom) / gcd(Num, Denom)
Original:
constexpr value of type std::intmax_t equal to abs(Denom) / gcd(Num, Denom)
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(public static Mitglied konstanten)

[Bearbeiten] Beispiel

#include <iostream>
#include <ratio>
 
int main()
{
    typedef std::ratio<2, 3> two_third;
    typedef std::ratio<1, 6> one_sixth;
    typedef std::ratio_multiply<two_third, one_sixth> r;
    std::cout << "2/3 * 1/6 = " << r::num << '/' << r::den << '\n';
}

Output: 

2/3 * 1/6 = 1/9
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