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

Subject: Re: [Boost-users] How to store on exception object ?
From: Timothy Madden (terminatorul_at_[hidden])
Date: 2010-08-31 13:05:37

On 8/31/2010 7:01 PM, Binglong Xie wrote:
> Does code below work correctly? (C++0x fashion)
> =================================================================
My project uses Visual Studio 2008  and these C++0x functions do not 
work. Nice to see that they are about the enter the standard, though :)
And also, Visual Studio 2010 looks like it has these.

> 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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>>