Re: Issues with C++/CLI wrappers and local static variables in quantlib

Posted by Simon Shakeshaft on
URL: http://quantlib.414.s1.nabble.com/Issues-with-C-CLI-wrappers-and-local-static-variables-in-quantlib-tp189p191.html

Hi Luigi,

In the end I had to make changes to singleton.hpp and all the currency
classes in america.hpp, africa.hpp, asia.hpp, europe.hpp and oceania.hpp.
The currency classes also required the addition of a null deleter on the
boost::shared_ptr declaration to  overcome the CLR shutdown issues.

It may be good just to park the code in a new folder along with a readme,
rather than merge/test the changes into the existing codebase?

Simon.

-----Original Message-----
From: Luigi Ballabio [mailto:[hidden email]]
Sent: 24 August 2012 10:28
To: Simon Shakeshaft
Cc: [hidden email]
Subject: Re: [Quantlib-users] Issues with C++/CLI wrappers and local static
variables in quantlib

Hi Simon,
    we moved the instance to the local scope because we had problems with
other compilers, but this might not be relevant anymore.  If you post a
patch, I'll be happy to try it.

Luigi

On Mon, Aug 6, 2012 at 10:42 AM, Simon Shakeshaft
<[hidden email]> wrote:

> Hi,
>
>
> I've been looking at building some C++/CLI wrappers around the
> library, partially as an exercise to become more familiar with CLI
> programming and partially to compare the approach with SWIG.
>
>
>
> However, I've run into a issue which may be a compiler issue but
> Microsoft have it closed as 'Won't Fix'. The issue manifested it first
> in the Singleton [patterns] class, as I was trying to migrate the FRA
> example across to C#, using some of the wrapped classes I already had.
> In the Singleton class the instance() method declares a static
> variable of a native type with a destructor.
>
>
>
> However the compiler registers a managed destructor with atexit and
> when the assembly is unloaded the CLR is already shut down, and an
> attempt to transition back to managed code results in an exception
> which cannot be caught.
> e.g.
> First-chance exception at 0x76a2b9bc in app.exe: 0xC0020001: The
> string binding is invalid.
> Unhandled exception at 0x76a2b9bc in app.exe: 0xC0020001: The string
> binding is invalid.
>
>
>
> The case on Microsoft Connect is here:
>
> https://connect.microsoft.com/VisualStudio/feedback/details/336844/sta
> tic-variable-in-native-method-causes-exception-c0020001-during-process
> -exit
>
>
>
> The exception generates the annoying '... .exe has encountered a
> problem and needs to close' dialog.  This can be worked around by the
> use of the SetErrorMode(), prior to exit, however the exception is
> just masked at this point and the exit is not clean.
>
>
>
>
> It's possible to move the local static variable in the Singleton class
> to the class level as a private member, and I've done this on my
> working copy - that works fine, the exit is now clean.  However
> similar code exists in many of the QuantLib classes - the specific

currency classes are a case in point.

>
>
>
>
> I'd be quite happy to work through the classes and pass the changes
> across, if this would be useful, otherwise I can work around by using
> SetErrorMode() etc.
>
> Best Regards
> Simon
>
>
>
>
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