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std::rel_ops::operator!=,>,<=,>=

De cppreference.com
< cpp‎ | utility

Déclaré dans l'en-tête <utility>
template<class T >
bool operator!=(const T& lhs, const T& rhs );
(1)
template<class T >
bool operator>(const T& lhs, const T& rhs );
(2)
template<class T >
bool operator<=(const T& lhs, const T& rhs );
(3)
template<class T >
bool operator>=(const T& lhs, const T& rhs );
(4)
Étant donné défini par l'utilisateur operator== et operator< pour les objets de T type, met en œuvre les sens habituel d'autres opérateurs de comparaison .
Original:
Given a user-defined operator== and operator< for objects of type T, implements the usual semantics of other comparison operators.
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1)
Met en œuvre operator!= en termes de operator== .
Original:
Implements operator!= in terms of operator==.
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2)
Met en œuvre operator> en termes de operator< .
Original:
Implements operator> in terms of operator<.
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3)
Met en œuvre operator<= en termes de operator< .
Original:
Implements operator<= in terms of operator<.
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4)
Met en œuvre operator>= en termes de operator< .
Original:
Implements operator>= in terms of operator<.
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Sommaire

[modifier]Paramètres

lhs -
gauche argument
Original:
left-hand argument
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rhs -
droite argument
Original:
right-hand argument
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[modifier]Retourne la valeur

1)
Retours true si lhs' est pas égal à rhs .
Original:
Returns true if lhs is not equal to rhs.
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2)
Retours true si lhs est plus que rhs .
Original:
Returns true if lhs is greater than rhs.
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3)
Retours true si lhs' est inférieure ou égale à rhs .
Original:
Returns true if lhs is less or equal to rhs.
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4)
Retours true si lhs est' plus ou égale à rhs .
Original:
Returns true if lhs is greater or equal to rhs.
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[modifier]Mise en œuvre possible

First version
namespace rel_ops {template<class T >bool operator!=(const T& lhs, const T& rhs ){return!(lhs == rhs);}}
Second version
namespace rel_ops {template<class T >bool operator>(const T& lhs, const T& rhs ){return rhs < lhs;}}
Third version
namespace rel_ops {template<class T >bool operator<=(const T& lhs, const T& rhs ){return!(rhs < lhs);;}}
Fourth version
namespace rel_ops {template<class T >bool operator>=(const T& lhs, const T& rhs ){return!(lhs < rhs);}}

[modifier]Exemple

#include <iostream>#include <utility>   struct Foo {int n;};   bool operator==(const Foo& lhs, const Foo& rhs){return lhs.n== rhs.n;}   bool operator<(const Foo& lhs, const Foo& rhs){return lhs.n< rhs.n;}   int main(){ Foo f1 ={1}; Foo f2 ={2};usingnamespace std::rel_ops;   std::cout<<std::boolalpha;std::cout<<"not equal?  : "<<(bool)(f1 != f2)<<'\n';std::cout<<"greater?  : "<<(bool)(f1 > f2)<<'\n';std::cout<<"less equal?  : "<<(bool)(f1 <= f2)<<'\n';std::cout<<"greater equal? : "<<(bool)(f1 >= f2)<<'\n';}

Résultat :

not equal?  : true greater?  : false less equal?  : true greater equal? : false
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