Re: [Boost-users] How to store on exception object ?

Subject: Re: [Boost-users] How to store on exception object ?
From: Binglong Xie (binglongx_at_[hidden])
Date: 2010-08-31 12:01:23

Does code below work correctly? (C++0x fashion)
=================================================================
std::exception_ptr g_ex; 
//global variable is no good, may be wrapped into callback params.

void my_callback()
{
  try
  {
     callback_cpp_impl(); // may throw
  }
  catch(...)
  {
     assert(g_ex==nullptr);
     g_ex = std::current_exception();
  }
}

void foo()
{
  try
  {
    g_ex = nullptr;
    call_C(&my_callback);
    if( g_ex!=nullptr )
      std::rethrow_exception(g_ex);
  }
  catch... // normal catch as if the exception is thrown locally.
}

--------------------------------------------------
From: "Steven Watanabe" <watanabesj_at_[hidden]>
Sent: Tuesday, August 31, 2010 11:04 AM
To: <boost-users_at_[hidden]>
Subject: Re: [Boost-users] How to store on exception object ?

> AMDG
> 
> Timothy Madden wrote:
>> In a callback function I need to store and save an exception object 
>> for until the callback is finished and the control is returned to my 
>> application code. The callback is invoked by the C language code in 
>> minizip library from zlib-1.2.3 contrib directory, and I need to throw 
>> the exception when control returns to my application invoking minizip 
>> functions.
>>
>> This is true for any exception that might get thrown and caught in my 
>> callback, so I would like to do that for any exception type.
>>
>> However how can I store a thrown object for later re-throw without the 
>> actual exception type ? Is there a way to do that ?
> 
> I think this is what boost::exception_ptr is for.
> http://www.boost.org/libs/exception/doc/exception_ptr.html
> 
> In Christ,
> Steven Watanabe
> 
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