std::ratio_equal — cppreference.com

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Déclaré dans l'en-tête `<ratio>`
`template< class R1, class R2 > struct ratio_equal : std::integral_constant;`

Si les ratios R1 et R2 sont égaux, fournit l'élément constant value true égale. Sinon, value est 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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Inherited from std::integral_constant

Member constants


value [ statique Original: static The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. ]	`true` si `R1::num == R2::num && R1::den == R2::den` , `false` autrement Original: `true` if `R1::num == R2::num && R1::den == R2::den` , `false` otherwise The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (constante membre statique publique)

Member functions


	convertit l'objet en `bool`, retourne `value` Original: converts the object to `bool`, returns `value` The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (fonction membre publique)

Member types


Type d' Original: Type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.	Definition

`value_type`	`bool`

`type`	`std::integral_constant<bool, value>`

Mise en œuvre possible

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

Exemple

#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";
    }
}

Résultat :