Re: [boost] try... catch... finally?

From: Alexander Nasonov (alnsn_at_[hidden])
Date: 2007-04-06 16:12:33

Hans Larsen wrote:
>    BOOST_SCOPE_EXIT {
>      // ...
>    }
> (msc-only)
I'm not going to implement this. And I'm not even going to study
Steven's asm code. Sorry, Steven ;-)

> versus
>    BOOST_SCOPE_EXIT( (hello)(world) ) {
>      // ...
>    }
> (on everything) is a clear choice for me.
With BOOST_SCOPE_EXIT_END in the end, it is my favorite at present.
It fails on msvc in some cases so I'm going to fix it in non-portable
way but
a) only for msvc
b) with much less asm

What's needed is somehow get a value of ptr without referencing it by
name (because it depends on __LINE__ but we don't know its value):

params_t params(hello, world);
void* ptr = &params;

// definitions etc but no stack manipulations

scope_exit_t scope_exit = { ptr }; // get rid of ptr here!

scope_exit_t has a user-defined dtor and no virtual functions.
There is only one memory allocation on the stak after ptr allocation -
the scope_exit object construction.

May be I could reserve a register at the second line and use it at
the last line? Names of registers don't depend on __LINE__!

-- 
Alexander Nasonov
http://nasonov.blogspot.com
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