- Boost - lists.boost.org

Volunteering to fix tab and min/max issues
by Jeremiah Willcock 21 May '09

21 May '09

Since tabs in source files and min/max guideline violations are so easy to correct, is it OK if I just fix them in all libraries (except for the inspection tool's examples)? I will not do any that appear to be intentional or that would change the meaning of the code. Do I have permission to do that and just commit the changes? -- Jeremiah Willcock

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how to build boost with bzip2 in non-standard location?
by Oliver Kullmann 20 May '09

20 May '09

Hello, I want to build the full boost library, while I don't have bzip2 installed system-wide (but I just downloaded and installed it locally). It seems to me that http://www.boost.org/boost-build2/doc/html/bbv2/tasks/libraries.html should be relevant here for that task, but I find the descriptions too general to understand. I wonder whether somebody could simply tell me the lines to be entered into the bjam-configuration file? Perhaps bz2 : : <file> Path_to_libbz2.a ; But how to specify where to find bzlib.h ? Isn't it possible to specify the base directory, where then, as, usual include, lib and bin are found? Thanks in any case! Oliver

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bootstrap.sh bug in 1.39.0
by Chris Saunders 20 May '09

20 May '09

There is a typo in the lib install directories in bootstrap.sh: $ diff bootstrap.sh bootstrap.sh.fixed 252c252 < LIBDIR="$EXPREFIX/lib" --- > LIBDIR="$EPREFIX/lib" 390c390 < EOF \ No newline at end of file --- > EOF ps. I wouldn't have minded checking what's on the head of svn first and reporting this throught the regular bug channels, but my browser won't let me past these certificate errors: """ Secure Connection Failed svn.boost.org uses an invalid security certificate. The certificate is not trusted because the issuer certificate is unknown. (Error code: sec_error_unknown_issuer) . . . etc """

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Question for C++ experts about exception allocation failure
by Emil Dotchevski 20 May '09

20 May '09

How is failure to allocate an exception object handled in various compilers? 15.1.4 says that "the memory for the temporary copy of the exception being thrown is allocated in an unspecified way" but I don't think it specifies behavior for the case when the allocation fails. I know that some compilers allocate exceptions from the heap, so does this mean that an attempt to throw any exception could, in theory, result in a std::bad_alloc being thrown instead? As far as I can tell such behavior wouldn't violate the C++ standard, but I'm not sure my interpretation is correct. Anyone? Emil Dotchevski Reverge Studios, Inc. http://www.revergestudios.com/reblog/index.php?n=ReCode

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[MPL] Is there an "include all" header?
by Adam Badura 20 May '09

20 May '09

I am looking for a "include all" header for Boost.MPL. Is there such? For the Boost.Preprocessor (having similar structure) there is <boost/preprocessor.hpp> however <boost/mpl.hpp> does not exist. Is it by purpose or just a forgotten feature? Actually I think having such "include all" headers is very convenient especially for larger libraries. (Yes, I know I can write such header by myself and then just use it every time I want to use Boost.MPL however having a "standard one" would be easier I think.) Adam Badura

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Volunteering to be a Review Manager
by Stewart, Robert 20 May '09

20 May '09

One thing that http://www.boost.org/community/reviews.html#Review_Manager doesn't mention is how a prospective review manager should volunteer. Presumably, one just sends a message to the developer's list to that effect, but I'd think a prescribed subject line would increase the likelihood that the review wizard sees it. _____ Rob Stewart robert.stewart(a)sig.com Software Engineer, Core Software using std::disclaimer; Susquehanna International Group, LLP http://www.sig.com IMPORTANT: The information contained in this email and/or its attachments is confidential. If you are not the intended recipient, please notify the sender immediately by reply and immediately delete this message and all its attachments. Any review, use, reproduction, disclosure or dissemination of this message or any attachment by an unintended recipient is strictly prohibited. Neither this message nor any attachment is intended as or should be construed as an offer, solicitation or recommendation to buy or sell any security or other financial instrument. Neither the sender, his or her employer nor any of their respective affiliates makes any warranties as to the completeness or accuracy of any of the information contained herein or that this message or any of its attachments is free of viruses.

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Re: [boost] Interest check: container with preallocated buffer
by Brian Wood 19 May '09

19 May '09

Thorsten Ottosen writes: >>Dmitry Vinogradov skrev: >> Boost.Array offers constant size container with preallocated buffer, >> Boost.Optional provides from zero to one element. There are no STL >> container with preallocated buffer and it seems custom allocator does >> not help to do this with existing containers. >> >> Does any container exist to offer functionality like Boost.Array but >> allowing to store from 0 to N elements? Is there any interest in such >> container? >> >> PS. It's similar to fixed_string but as a generic container. >Please see >http://www.cs.aau.dk/~nesotto/boost/auto_buffer.zip >http://www.cs.aau.dk/~nesotto/boost/trunk/libs/auto_buffer/doc/html/ > I was looking at the documentation and the Serialization and "Differences from std::vector<T>" pages were both empty. It would be nice to indicate there's nothing there yet for those pages. On the Semantics page is says: auto_buffer( const auto_buffer& r ); - *Effect:* Copy constructor. - *Postconditions:* capacity() == max(r.size(),N) && size() == r.size() . - *Throws:* Nothing if size() <= N and the copy constructor of T cannot throw. Otherwise this might throw exceptions from the allocator of from T's copy constructor. I think there's a typo in the last sentence there. -- Brian Wood Ebenezer Enterprises www.webEbenezer.net "Then Samuel took a rock and set it up between Mizpah and Shen. He named it Ebenezer [Rock of Help] and said, 'Until now the LORD has helped us.'"

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[array] assignement operator
by vicente.botet 19 May '09

19 May '09

Boost.Array defines an assignement operator with the following prototype template<typename T, std::size_t N> class array { public: /... template<typename U> array& operator=(const array<U, N>& rhs); // Effects:std::copy(rhs.begin(),rhs.end(), begin()) }; I was wondering if this can be extended to manage with arrays of different sizes, having as effect the copying of the minimum of N and M elements from the source to the target. template<typename T, std::size_t N> class array { public: /... template<typename U, std::size_t M> array& operator=(const array<U, M>& rhs); // Effects:std::copy(rhs.begin(),rhs.begin()+min(N,M), begin()) }; Is there anything wrong with this interface? Best, _____________________ Vicente Juan Botet Escribá

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Boost up for SourceForge Community Choice Award
by David Abrahams 19 May '09

19 May '09

Cast your vote here: http://tinyurl.com/boost-cca09 Cheers, -- Dave Abrahams BoostPro Computing http://www.boostpro.com

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[thread] Exception propagation for thread::join
by Emil Dotchevski 18 May '09

18 May '09

When joining a thread, in case the thread has exited, I find it convenient to have any exception the thread function throws propagated to the caller of join(). Just as an illustration of what I'm talking about, below is my Win32 implementation of a similar interface. An interesting design decision is what to do if a detached thread throws an exception. Note the line marked with (1) -- I've decided to assert in this case (instead of ignoring the exception, which would be the alternative behavior.) Would something similar be a good addition to Boost Thread? struct windows_thread_info { DWORD id; boost::shared_ptr<HANDLE const> h; boost::function<void()> f; mutable boost::exception_ptr e; boost::shared_ptr<windows_thread_info> self; ~windows_thread_info() { assert(!e); } }; namespace { DWORD WINAPI thread_proc_fwd( void * p ) { assert(p!=0); boost::weak_ptr<windows_thread_info> w; boost::function<void()> f; { boost::shared_ptr<windows_thread_info> wti; static_cast<windows_thread_info *>(p)->self.swap(wti); assert(wti); f=wti->f; assert(f); w=wti; } try { f(); } catch( ... ) { boost::shared_ptr<windows_thread_info> wti=w.lock(); assert(wti); //(1) wti->e=boost::current_exception(); } return 0; } } boost::shared_ptr<windows_thread_info const> win_CreateThread( LPSECURITY_ATTRIBUTES lpThreadAttributes, SIZE_T dwStackSize, boost::function<void()> const & f, DWORD dwCreationFlags ) { assert(f); boost::shared_ptr<windows_thread_info> wti(new windows_thread_info); wti->f=f; wti->self=wti; if( HANDLE h=CreateThread(lpThreadAttributes,dwStackSize,thread_proc_fwd,wti.get(),dwCreationFlags,&wti->id) ) { make_handle(h,CloseHandle).swap(wti->h); return wti; } else { wti->self.reset(); BOOST_THROW_EXCEPTION(x_system() << xi_win_last_error(GetLastError()) << xi_function("CreateThread")); } } void join( windows_thread_info const & wti ) { (void) win_WaitForSingleObject(*wti.h,INFINITE); boost::exception_ptr e; { using std::swap; swap(e,wti.e); } if( e ) boost::rethrow_exception(e); } -- Emil Dotchevski Reverge Studios, Inc. http://www.revergestudios.com/reblog/index.php?n=ReCode

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