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

 

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Operadores relacionales Original: Relational operators The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

rel_ops::operator!= rel_ops::operator> rel_ops::operator<= rel_ops::operator>=

Pares y tuplas Original: Pairs and tuples 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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tuple (C++11)

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piecewise_construct (C++11)

Cambiar, hacia adelante y mover Original: Swap, forward and move The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

swap

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Defined in header <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)

Dada una definida por el usuario y operator== operator< para objetos de tipo T, implementa la semántica usual de otros operadores de comparación .

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)

Implementa operator!= en términos de operator== .

Original:

Implements operator!= in terms of operator==.

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2)

Implementa operator> en términos de operator< .

Original:

Implements operator> in terms of operator<.

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3)

Implementa operator<= en términos de operator< .

Original:

Implements operator<= in terms of operator<.

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4)

Implementa operator>= en términos de operator< .

Original:

Implements operator>= in terms of operator<.

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Parámetros

lhs	-	izquierda argumento 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	-	derecha argumento 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.

Valor de retorno

1)

Devoluciones true si lhs no igual a rhs .

Original:

Returns true if lhs is not equal to rhs.

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2)

Devoluciones true si lhs es' mayor que rhs .

Original:

Returns true if lhs is greater than rhs.

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3)

Devoluciones true si lhs es menor o igual' a rhs .

Original:

Returns true if lhs is less or equal to rhs.

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4)

Devoluciones true si lhs es' mayor o igual a rhs .

Original:

Returns true if lhs is greater or equal to rhs.

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Posible implementación

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); } }

Ejemplo

#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};
    using namespace 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';
}

Output:

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