std::nested_exception
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在头文件 <exception> 中定义
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class nested_exception; |
(C++11 起) | |
std::nested_exceptions
是一个多态的混合类,它可以捕获和存储当前的异常,它可以任意类型的异常巢内相互. 原文:
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. [编辑] 成员函数
构造一个nested_exception (公共成员函数) | |
[虚]</div></div>
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解构嵌套异常 (公有虚成员函数) |
替换内容的nested_exception 原文: replaces the contents of a nested_exception (公共成员函数) | |
抛出的存储异常 (公共成员函数) | |
获得一个指针所存储的异常 原文: obtains a pointer to the stored exception (公共成员函数) |
[编辑] 示例
示范建设和递归,通过嵌套异常对象
原文:
Demonstrates construction and recursion through a nested exception object
#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 holds void print_exception(const std::exception& e, int level = 0) { std::cerr << std::string(level, ' ') << "exception: " << e.what() << '\n'; try { std::rethrow_if_nested(e); } catch(const std::exception& e) { print_exception(e, level+1); } catch(...) {} } // sample function that catches an exception and wraps it in a nested exception void open_file(const std::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 exception void 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 exception int main() { try { run(); } catch(const std::exception& e) { print_exception(e); } }
输出:
exception: run() failed exception: Couldn't open nonexistent.file exception: basic_ios::clear
[编辑] 另请参阅
(C++11) |
处理异常对象的共享指针类型 原文: shared pointer type for handling exception objects (typedef) |