RE: [Boost-Users] Re: RegEx++ and Visual Studio .NET STL Problems

From: John Osborn (john_at_[hidden])
Date: 2002-07-08 09:27:23

I don't know if this is the problem, but I noticed that the problem does
indeed involve the 16 byte internal array.  When this array is exceeded a
memory fault occurs.  You don't happen to remember where you read about
this, do you?
  -----Original Message-----

  I had read in some place that the string implementation of .NET uses an
  internal array of 16 chars when the string is small enough and grows only
  when that isn't enough. This can cause problems for strings created on the
  stack and passed to external procedures.
  Can this be the case ? (I don't have .NET so I don't know if this is
true).

    Nuno Lucas

  At 11:07 03-07-2002 -0500, you wrote:
  >I'm checking my code for memory overwrites, but I'm fairly certain that's
  >not the cause (at least on my part).  I 'm thinking that it is a code
  >generation problem as John Maddock described.
  >
  >I am calling regex++ from a COM inproc server dll.  It won't link if I
try
  >to link to the static boost library because various STL calls are already
  >defined.  If I use the boost dll then I get the heap problem as already
  >described.
  >
  >With MSVC++ version 6 I am able to link to the static boost library with
no
  >problem.
  >   -----Original Message-----
  >   From: Nir Dremer [mailto:nir_dremer_at_[hidden]]
  >   Sent: Wednesday, July 03, 2002 3:03 AM
  >   To: Boost-Users_at_[hidden]
  >   Subject: Re: [Boost-Users] Re: RegEx++ and Visual Studio .NET STL
Problems
  >
  >
  >   This problem is bad heap allocation.
  >   if anywhere in your program you create something using
  >   the new operand and afterward access some ilegal
  >   position (beyond the end of the allocation) - vc7
  >   compiler will detect that and will popup an assert.
  >
  >   regex++ is working excellent with vc7 so you can
  >   assume it's something in the code you wrote that
  >   corrupts the heap.
  >
  >   Good idea would be to refer to _CrtCheckMemory() API
  >   and to debug you allocations code.
  >
  >
  >   Cheers,
  >   Nir
  >
  >   --- regexpp <john_maddock_at_[hidden]> wrote:
  >   > --- In Boost-Users_at_y..., "john_p_osborn"
  >   > <john_p_osborn_at_y...> wrote:
  >   > > When I upgraded to Visual Studio .NET my programs
  >   > that use regex++
  >   > > stopped working.  Many simple calls fail during
  >   > string destruction
  >   > > with bad heap pointers.  I never had any problems
  >   > under msvc
  >   > version
  >   > > 6.  Has anyone else experienced this?  Is a
  >   > problem with the new MS
  >   > > STL?
  >   >
  >   > Nope, but make doubly sure that you are using a
  >   > shared memory
  >   > allocator, and if your project uses dll's that all
  >   > the dll's are
  >   > built with the same code generation options (ie the
  >   > dll runtime).
  >   >
  >   > Hope this helps,
  >   >
  >   > John Maddock
  >   >
  >   >
  >
  >
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