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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;
Verifica se esta shared_ptr precede other na aplicação definida proprietário baseado (em oposição ao valor) ordem. A ordem é tal que dois ponteiros inteligentes comparar equivalente só se forem ambos vazios ou se ambos do próprio objeto, mesmo se os valores dos indicadores obtidos pelo get () são diferentes (por exemplo, porque eles apontam subobjetos diferentes dentro do mesmo 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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Esta ordenação é usado para fazer partilhada e ponteiros fracos utilizável como chaves em recipientes associativos, tipicamente através 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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Índice

[editar] Parâmetros

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

true se *this precede other, false contrário. Implementações comuns comparar os endereços dos blocos de controle.
Original:
true if *this precedes other, false otherwise. Common implementations compare the addresses of the control blocks.
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[editar] Exemplo

#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] Veja também

fornece de tipo misto ordenação proprietário baseado de ponteiros compartilhados e fraco
Original:
provides mixed-type owner-based ordering of shared and weak pointers
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(modelo de classe) [edit]