std::rel_ops::operator!=,>,<=,>=
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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
1) 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.The text has been machine-translated via Google Translate.
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Met en œuvre operator!= en termes de operator== .
2) Original:
Implements operator!= in terms of operator==.
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Met en œuvre operator> en termes de operator< .
3) Original:
Implements operator> in terms of operator<.
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Met en œuvre operator<= en termes de operator< .
4) Original:
Implements operator<= in terms of operator<.
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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 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
rhs | - | droite argument Original: right-hand argument The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
[modifier]Retourne la valeur
1)Retours true si
2) lhs
' est pas égal à rhs
.Original:
Returns true if
lhs
is not equal to rhs
.The text has been machine-translated via Google Translate.
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Retours true si
3) lhs
est plus que rhs
.Original:
Returns true if
lhs
is greater than rhs
.The text has been machine-translated via Google Translate.
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Retours true si
4) lhs
' est inférieure ou égale à rhs
.Original:
Returns true if
lhs
is less or equal to rhs
.The text has been machine-translated via Google Translate.
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Retours true si
lhs
est' plus ou égale à rhs
.Original:
Returns true if
lhs
is greater or equal to rhs
.The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
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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