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std::ratio_subtract

De cppreference.com
< cpp‎ | numeric‎ | ratio

 
 
Bibliothèque Numerics
Fonctions mathématiques courantes
Virgule flottante environnement
Nombres complexes
Tableaux numériques
La génération de nombres pseudo-aléatoires
Moment de la compilation arithmétique rationnelle (C++11)
Génériques des opérations numériques
Original:
Generic numeric operations
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iota (C++11)
accumulate
inner_product
adjacent_difference
partial_sum
 
Compiler arithmétique rationnelle du temps
ratio (C++11)
Arithmétique
Original:
Arithmetic
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ratio_add (C++11)
ratio_subtract (C++11)
ratio_multiply (C++11)
ratio_divide (C++11)
Comparaison
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 <ratio>
template< class R1, class R2 >
using ratio_subtract = /* unspecified */;
L'alias de modèle std::ratio_subtract indique le résultat de la soustraction de deux fractions rationnelles exactes représentés par les instances std::ratio R1 et R2. Le résultat d'une std::ratio exemple std::ratio<Num, Denom>Num == R1::num * R2::den - R2::num * R1::den et Denom == R1::den * R2::den .
Original:
The template alias std::ratio_subtract denotes the result of subtracting 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::den - R2::num * R1::den and Denom == R1::den * R2::den.
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[modifier] Types de membres

Type du membre Définition
type std::ratio<num, den>

[modifier] Constantes membres

num
[
statique
Original:
static
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constexpr valeur de type std::intmax_t égale à 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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(constante membre statique publique)
den
[
statique
Original:
static
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constexpr valeur de type std::intmax_t égale à abs(Denom) / gcd(Num, Denom)
Original:
constexpr value of type std::intmax_t equal to abs(Denom) / gcd(Num, Denom)
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(constante membre statique publique)

[modifier] Exemple

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

Résultat :

2/3 - 1/6 = 1/2