std::exception_ptr
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Definido no cabeçalho <exception> | ||
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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[editar]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(conststd::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"
[editar]Veja também
(C++11) | cria uma std::exception_ptr a partir de um objeto de exceção Original: creates an std::exception_ptr from an exception object The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (modelo de função) |
(C++11) | captures the current exception in a std::exception_ptr (função) |
(C++11) | lança a exceção de um std::exception_ptr Original: throws the exception from an std::exception_ptr The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (função) |
