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    std::ratio_multiply

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    <metanoindex/>

     
    C++
     
    Numerik-Bibliothek
    Gemeinsame mathematischen Funktionen
    Floating-Point-Umgebung
    Komplexe Zahlen
    Numerische Arrays
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    Compile-time rationale Arithmetik (C++11)
    Generische numerische Operationen
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    Generic numeric operations
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    iota(C++11)
    accumulate
    inner_product
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    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
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    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)
     
    <tbody> </tbody>
    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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    Mitglied Typen

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

    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)

    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