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      std::set_new_handler

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      < cpp | memory | new

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      <tbody> </tbody>
      Definido no cabeçalho <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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      Notas

      O' nova função-manipulador é a função chamada por
      funções de alocação
      Original:
      allocation functions
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       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
      funções de alocação
      Original:
      allocation functions
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       whenever a memory allocation attempt fails. Its intended purpose is one of three things:
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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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      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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      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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      Exceções

      noexcept specification:  
      <tbody> </tbody>
      noexcept
        (desde C++11)

      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';
    }
}

      Saída: 

      Memory allocation failed, terminating
std::bad_alloc

      Veja também
      funções de alocação
      Original:
      allocation functions
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      (função) [edit]
      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]