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Subject: Re: [boost] [pool] detail/mutex.hpp may include windows.h and pollute namespace with windows definitions.
From: Stewart, Robert (Robert.Stewart_at_[hidden])
Date: 2010-10-11 07:15:45

Marsh Ray wrote:
> On 10/09/2010 06:19 AM, Joshua Boyce wrote:
> >
> > #pragma pack(push, 8)
> >> typedef struct _RTL_CRITICAL_SECTION
> > {
> > void* DebugInfo;
> > long LockCount;
> >> #pragma pack(pop)
> Suggestion:
> namespace boost { namespace boost_windows_h {
> #pragma pack(push, 8)
> {
> void * reserved1;
> long reserved2;
> long reserved3;
> };
> #pragma pack(pop)
> } }
> The 'typedef struct' thing is a holdover from C.

> No reason to keep that struct tag, I don't think intended for
> use. Leading underscores are reserved for compiler vendors
> (like Microsoft) and organizations that ship non-standard
> headers (like Microsoft).
> The field data seems to change with OS versions, so code is not
> supposed to rely on it. The fields are effectively reserved.
> Personally, I'd use a lowercase struct name (it's not a macro
> after all) and omit the silly typedef. I'd be less concerned
> with it looking like the official headers if the point is to
> not include them. Just re-use the minimum needed for
> compatibility, which in this case is just sizeof() and
> __alignof().

Those suggestions appear reasonable, but there are a couple of
additional things that would be in order.

First, rather than using unsized types and assuming they are and
will always remain the expected size, use typed sizes like
int32_t. One could even collapse the structure further by using
one int64_t in place of the two (assumed) 32 bit longs. Given
the use of void *'s for the other fields, presumably the
structure's size varies between 32 and 64 bit platforms, so the
same could not be done for those fields so neatly.

Second, add a test to ensure that the size of the fabricated
proxy is the same as the real thing. That will ensure that the
definition remains appropriate for all platforms present and
future. Since the test will be in compiled code that doesn't
affect the header, it can safely include windows.h to get the
real definition.

Rob Stewart robert.stewart_at_[hidden]
Software Engineer, Core Software using std::disclaimer;
Susquehanna International Group, LLP

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