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std::set_new_handler

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< cpp‎ | memory‎ | new

 
 
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Defined in header <new>
std::new_handler set_new_handler(std::new_handler new_p)
Faz new_p a nova função nova-manipulador global e retorna o instalado anteriormente nova-manipulador.
Original:
Makes new_p the new global new-handler function and returns the previously installed new-handler.
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Índice

[editar] Notas

sempre uma tentativa de alocação de memória falhar. Sua finalidade é uma de três coisas:
Original:
The new-handler function is the function called by
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1)
disponibilizar mais memória
Original:
make more memory available
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2)
terminar o programa (por exemplo, por std::terminate chamada)
Original:
terminate the program (e.g. by calling std::terminate)
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3)
jogar exceção de std::bad_alloc tipo ou derivado de std::bad_alloc
Original:
throw exception of type std::bad_alloc or derived from std::bad_alloc
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Se retornos nova-manipulador, a função de alocação repete a tentativa de alocação previamente falhou e chama o novo novamente manipulador-se a alocação de falhar novamente. Para encerrar o ciclo, novo-manipulador pode chamar std::set_new_handler(nullptr): se, depois de uma tentativa de alocação falhou, função de atribuição descobre que std::get_new_handler retorna um valor ponteiro nulo, ele vai jogar std::bad_alloc.
Original:
If new-handler returns, the allocation function repeats the previously-failed allocation attempt and calls the new-handler again if the allocation fails again. To end the loop, new-handler may call std::set_new_handler(nullptr): if, after a failed allocation attempt, allocation function finds that std::get_new_handler returns a null pointer value, it will throw std::bad_alloc.
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No arranque do programa, novo-manipulador é um ponteiro nulo.
Original:
At program startup, new-handler is a null pointer.
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[editar] Parâmetros

new_p -
ponteiro para função de std::new_handler tipo ou ponteiro nulo
Original:
pointer to function of type std::new_handler, or null pointer
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[editar] Valor de retorno

O manipulador instalada anteriormente novo, ou um valor de ponteiro nulo se nenhum foi instalado.
Original:
The previously-installed new handler, or a null pointer value if none was installed.
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[editar] Exceções

noexcept specification:  
noexcept
  (a partir do C++ 11)

[editar] Exemplo

#include <iostream>
#include <new>
void handler()
{
    std::cout << "Memory allocation failed, terminating\n";
    std::set_new_handler(nullptr);
}
int main()
{
    std::set_new_handler(handler);
    try {
        while(true)
            new int[100000000ul];
    }catch(const std::bad_alloc& e) {
        std::cout << e.what() << '\n';
    }
}

Output:

Memory allocation failed, terminating
std::bad_alloc

[editar] Veja também

funções de alocação
Original:
allocation functions
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(função) [edit]
set_new_handler
registra um novo manipulador
Original:
registers a new handler
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(função) [edit]
tipo de função ponteiro do manipulador de novo
Original:
function pointer type of the new handler
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(typedef) [edit]
exceção lançada quando a alocação de memória falha
Original:
exception thrown when memory allocation fails
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(classe) [edit]