std::nested_exception

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C++
 
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initializer_list（C++11）
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关系运算符
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Relational operators
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rel_ops::operator>
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Pairs and tuples
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pair
tuple（C++11）
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piecewise_construct（C++11）
掉期，远期和移动
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Swap, forward and move
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swap
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错误处理
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Exception handling
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exception
uncaught_exception
exception_ptr（C++11）
make_exception_ptr（C++11）
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nested_exception（C++11）
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rethrow_if_nested（C++11）
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logic_error
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错误代码
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错误代码
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Defined in header <exception>
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.
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.
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[编辑] 成员函数
构造一个nested_exception
Original:
constructs a nested_exception
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（公共成员函数）
[虚拟的] </ SPAN></div></div>
解构嵌套异常
Original:
destructs a nested exception
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（虚拟公有成员函数）
替换内容的nested_exception
Original:
replaces the contents of a nested_exception
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（公共成员函数）
抛出的存储异常
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throws the stored exception
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（公共成员函数）
获得一个指针所存储的异常
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obtains a pointer to the stored exception
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（公共成员函数）

[编辑] 为例

[edit]

示范建设和递归，通过嵌套异常对象
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 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);
    }
}

Output: 

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
Original:
shared pointer type for handling exception objects
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（的typedef） [edit]
来自“http://zh.cppreference.com/mwiki/index.php?title=cpp/error/nested_exception&oldid=26894”