std::nested_exception
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Definido no cabeçalho <exception> | ||
class nested_exception; | (desde C++11) | |
std::nested_exceptions é uma classe mixin polimórficas que podem captar e armazenar a excepção de corrente, o que torna possível a excepções ninho de tipos arbitrárias uns dentro dos outros. Original:
std::nested_exceptions is a polymorphic mixin class which can capture and store the current exception, making it possible to nest exceptions of arbitrary types within each other. The text has been machine-translated via Google Translate.
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[editar]Funções de membro
constrói um nested_exception Original: constructs a nested_exception The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (função pública membro) | |
[virtual] | destrói uma exceção aninhada Original: destructs a nested exception The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (função pública virtual membro) |
substitui o conteúdo de um nested_exception Original: replaces the contents of a nested_exception The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (função pública membro) | |
lança a exceção armazenado Original: throws the stored exception The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (função pública membro) | |
obtém um ponteiro para a excepção armazenado Original: obtains a pointer to the stored exception The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (função pública membro) | |
[editar]Exemplo
Demonstra construção e recursividade através de um objeto de exceção aninhada
Original:
Demonstrates construction and recursion through a nested exception object
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#include <iostream>#include <stdexcept>#include <exception>#include <string>#include <fstream> // prints the explanatory string of an exception. If the exception is nested,// recurses to print the explanatory of the exception it holdsvoid print_exception(conststd::exception& e, int level =0){std::cerr<<std::string(level, ' ')<<"exception: "<< e.what()<<'\n';try{std::rethrow_if_nested(e);}catch(conststd::exception& e){ print_exception(e, level+1);}catch(...){}} // sample function that catches an exception and wraps it in a nested exceptionvoid open_file(conststd::string& s){try{std::ifstream file(s); file.exceptions(std::ios_base::failbit);}catch(...){std::throw_with_nested(std::runtime_error("Couldn't open "+ s));}} // sample function that catches an exception and wraps it in a nested exceptionvoid run(){try{ open_file("nonexistent.file");}catch(...){std::throw_with_nested(std::runtime_error("run() failed"));}} // runs the sample function above and prints the caught exceptionint main(){try{ run();}catch(conststd::exception& e){ print_exception(e);}}
Saída:
exception: run() failed exception: Couldn't open nonexistent.file exception: basic_ios::clear
[editar]Veja também
(C++11) | tipo ponteiro compartilhado para manusear objetos de exceção Original: shared pointer type for handling exception objects The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (typedef) |
