std::exception_ptr
De cppreference.com
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<tbody> </tbody>| Definido no cabeçalho <exception>
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typedef /*unspecified*/ exception_ptr; |
(desde C++11) | |
std::exception_ptr é um tipo de ponteiro-como anulável que gerencia um objeto de exceção que foi lançada e capturado com std::current_exception. Uma instância de std::exception_ptr pode ser passado para outra função, possivelmente em outro segmento, onde a exceção pode ser relançada e manipulados com uma cláusula catch.Original:
std::exception_ptr is a nullable pointer-like type that manages an exception object which has been thrown and captured with std::current_exception. An instance of std::exception_ptr may be passed to another function, possibly on another thread, where the exception may be rethrown and handled with a catch clause.The text has been machine-translated via Google Translate.
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Padrão construído
std::exception_ptr é um ponteiro nulo, ele não aponta para um objeto de exceção.Original:
Default-constructed
std::exception_ptr is a null pointer, it does not point to an exception object.The text has been machine-translated via Google Translate.
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Dois casos de
std::exception_ptr comparar iguais somente se ambos são nulos ou ambos ponto no objeto de exceção mesmo.Original:
Two instances of
std::exception_ptr compare equal only if they are both null or both point at the same exception object.The text has been machine-translated via Google Translate.
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std::exception_ptr não é implicitamente conversível para qualquer aritmética, enumeração, ou tipo de ponteiro. É convertida para bool.Original:
std::exception_ptr is not implicitly convertible to any arithmetic, enumeration, or pointer type. It is convertible to bool.The text has been machine-translated via Google Translate.
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O objeto de exceção referenciado por um
std::exception_ptr permanece válido enquanto ainda há pelo menos um std::exception_ptr que é referência a ele: std::exception_ptr é um ponteiro-propriedade compartilhada inteligente.Original:
The exception object referenced by an
std::exception_ptr remains valid as long as there remains at least one std::exception_ptr that is referencing it: std::exception_ptr is a shared-ownership smart pointer.The text has been machine-translated via Google Translate.
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Exemplo
#include <iostream>
#include <string>
#include <exception>
#include <stdexcept>
void handle_eptr(std::exception_ptr eptr) // passing by value is ok
{
try {
if (eptr != std::exception_ptr()) {
std::rethrow_exception(eptr);
}
} catch(const std::exception& e) {
std::cout << "Caught exception \"" << e.what() << "\"\n";
}
}
int main()
{
std::exception_ptr eptr;
try {
std::string().at(1); // this generates an std::out_of_range
} catch(...) {
eptr = std::current_exception(); // capture
}
handle_eptr(eptr);
} // destructor for std::out_of_range called here, when the eptr is destructed
Saída:
Caught exception "basic_string::at"