Re: [Boost-cmake] placement_new test failure under VC++8

Subject: Re: [Boost-cmake] placement_new test failure under VC++8
From: David Wolfe (dwolfe_at_[hidden])
Date: 2009-05-16 19:25:56

> Debug Error!
>  File
>  c:\projects\boost\libs\numeric\ublas\placement_new.cpp
>  Line: 63
>
>  Run-Time Check Failure #2 - Stack around the variable 'a' was
>  corrupted.

On 5/16/2009 7:59 AM, Mike Jackson wrote:
> So I am going to assume that there is an actual bug in the code. Is it
> possible to debug the program with a debugger and get the line of code
> that VS is bombing on?

It's definitely the creation of the 1-element UDT array at the same
address as the scalar instance that's causing the runtime check to
trigger:

     udt a;
     udt* ap = &a;

     // Capture placement new offsets for a udt
     new (ap) udt;
     int new_offset = int (udt::base_pointer - ap);
     new (ap) udt [1];
     int array_new_offset = int (udt::base_pointer - ap);

If I comment out the line that reads 'new (ap) udt[1]', the assertion
doesn't trigger.