Espaços nominais
Variantes
Acções

std::ratio_equal

Da cppreference.com
< cpp‎ | numeric‎ | ratio

 
 
Biblioteca numéricos
Funções matemáticas comuns
De ponto flutuante ambiente
Números complexos
Matrizes numéricas
Pseudo-aleatório de geração de números
Tempo de compilação aritmética racional (C++11)
Genéricos operações numéricas
Original:
Generic numeric operations
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iota(C++11)
accumulate
inner_product
adjacent_difference
partial_sum
 
Compilar hora aritmética racional
ratio(C++11)
Aritmética
Original:
Arithmetic
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ratio_add(C++11)
ratio_subtract(C++11)
ratio_multiply(C++11)
ratio_divide(C++11)
Comparação
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 >
struct ratio_equal : std::integral_constant;
Se as taxas de R1 e R2 são iguais, proporciona o membro constante value true igual. Caso contrário, é 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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Índice

Inherited from std::integral_constant

Member constants

value
[estática]
true se R1::num == R2::num && R1::den == R2::den , false contrário
Original:
true if R1::num == R2::num && R1::den == R2::den , false otherwise
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(membro estático público constante)

Member functions

operator bool
converte o objeto em bool, retorna value
Original:
converts the object to bool, returns value
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(função pública membro)

Member types

Tipo
Original:
Type
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Definition
value_type bool
type std::integral_constant<bool, value>

[editar] Possível implementação

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

[editar] Exemplo

#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