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std::shared_ptr::owner_before

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< cpp‎ | memory‎ | shared ptr

 
 
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template< class T >
bool owner_before( const shared_ptr<T>& other) const;
template< class T >
bool owner_before( const std::weak_ptr<T>& other) const;
Comprueba si esta shared_ptr precede other en ejecución definido propietario basado en (a diferencia de valor) orden. El orden es tal que dos punteros inteligentes comparar equivalente sólo si están vacíos o si ambos propia del mismo objeto, incluso si los valores de los indicadores obtenidos por get () son diferentes (por ejemplo, porque apuntan a subobjetos diferentes dentro de la misma objeto)
Original:
Checks whether this shared_ptr precedes other in implementation defined owner-based (as opposed to value-based) order. The order is such that two smart pointers compare equivalent only if they are both empty or if they both own the same object, even if the values of the pointers obtained by get() are different (e.g. because they point at different subobjects within the same object)
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Este orden se utiliza para hacer compartida y punteros débiles utilizable como claves en contenedores asociativos, típicamente a través std::owner_less .
Original:
This ordering is used to make shared and weak pointers usable as keys in associative containers, typically through std::owner_less.
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Contenido

[editar] Parámetros

other -
la std::shared_ptr o std::weak_ptr a ser comparado
Original:
the std::shared_ptr or std::weak_ptr to be compared
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[editar] Valor de retorno

true si *this precede other, false lo contrario. Las implementaciones habituales comparar las direcciones de los bloques de control .
Original:
true if *this precedes other, false otherwise. Common implementations compare the addresses of the control blocks.
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[editar] Ejemplo

#include <iostream>
#include <memory>
 
struct Foo {
    int n1;
    int n2; 
    Foo(int a, int b) : n1(a), n2(b) {}
};
int main()
{   
    auto p1 = std::make_shared<Foo>(1, 2);
    std::shared_ptr<int> p2(p1, &p1->n1);
    std::shared_ptr<int> p3(p1, &p1->n2);
 
    std::cout << std::boolalpha
              << "p2 < p3 " << (p2 < p3) << '\n'
              << "p3 < p2 " << (p3 < p2) << '\n'
              << "p2.owner_before(p3) " << p2.owner_before(p3) << '\n'
              << "p3.owner_before(p2) " << p3.owner_before(p2) << '\n';
 
    std::weak_ptr<int> w2(p2);
    std::weak_ptr<int> w3(p3);
    std::cout 
//              << "w2 < w3 " << (w2 < w3) << '\n'  // won't compile 
//              << "w3 < w2 " << (w3 < w2) << '\n'  // won't compile
              << "w2.owner_before(w3) " << w2.owner_before(w3) << '\n'
              << "w3.owner_before(w2) " << w3.owner_before(w2) << '\n';
 
}

Output:

p2 < p3 true
p3 < p2 false
p2.owner_before(p3) false
p3.owner_before(p2) false
w2.owner_before(w3) false
w3.owner_before(w2) false

[editar] Ver también

ofrece de tipo mixto propietario basado ordenamiento de los punteros compartidos y débil
Original:
provides mixed-type owner-based ordering of shared and weak pointers
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(clase de plantilla) [edit]