Namespace
Varianti

std::ratio_subtract

Da cppreference.com.
< cpp‎ | numeric‎ | ratio

 
 
Numeri libreria
Comuni funzioni matematiche
Virgola mobile ambiente
I numeri complessi
Array numerici
Pseudo-casuale generazione
In fase di compilazione aritmetica razionale (C++11)
Generici operazioni numeriche
Original:
Generic numeric operations
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iota(C++11)
accumulate
inner_product
adjacent_difference
partial_sum
 
Compilare aritmetica razionale del tempo
ratio(C++11)
Aritmetica
Original:
Arithmetic
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ratio_add(C++11)
ratio_subtract(C++11)
ratio_multiply(C++11)
ratio_divide(C++11)
Confronto
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 modello std::ratio_subtract denota il risultato della sottrazione due frazioni esatte razionali rappresentati dalle istanze std::ratio R1 e R2. Ne risulta un std::ratio istanza std::ratio<Num, Denom> dove Num == R1::num * R2::den - R2::num * R1::den e 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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[modifica] Membri tipi

Membro tipo
Original:
Member type
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Definition
type std::ratio<num, den>

[modifica] Membri costanti

num
[statico]
Valore constexpr di tipo std::intmax_t pari a 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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(pubblico membro statico costante)
den
[statico]
Valore constexpr di tipo std::intmax_t pari a abs(Denom) / gcd(Num, Denom)
Original:
constexpr value of type std::intmax_t equal to abs(Denom) / gcd(Num, Denom)
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(pubblico membro statico costante)

[modifica] Esempio

#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';
}

Output:

2/3 - 1/6 = 1/2