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long long support with GCC
by Aaron W. LaFramboise 27 Jul '04

27 Jul '04

Hi, As I'm sure you know, long long and unsigned long long are supported by GCC in C++. However, -std=c++98 (not quite sure why, to be honest) and -pedantic cause lots of warnings and errors to be generated in the Boost headers when long long is used. In my project, it is desirable to use these flags for other reasons, but the effect these flags have on the Boost headers is decidedly undesirable. So far, I've been wrapping the Boost headers in forwarding headers that mark the Boost headers as system headers so that they compile without warning or error. Is there any disadvantage to doing this? GCC supports long long even with the above options, but only if __extension__ is used. I notice that there a Boost-standard 64bit type, boost::int64_t. Is there some reason that this can't be typedef'ed using the GCC extension, and then this identifier used in all places where 'long long' is being used? Are there type system rules that prevent this, or some other reason? Thank you for your consideration, Aaron W. LaFramboise

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building boost on vc7.1 with stlport
by tweety 26 Jul '04

26 Jul '04

i first compiled (succesfully) stlport 4.6.2. then i ran "bjam "-sTOOLS=vc7.1-stlport" install" and it failed compiling the regex library. then i manually went to the libs\regex\build folder and ran "nmake /f vc7.1-stlport clean install" and it compiled the first thing ok and the 2nd time around threw a LOT of linker errors (well, only ~49, but they're stl-style-long :D). I set correctly the STLPORT_VERSION and the STLPORT_PATH env vars, the tools were loaded ok, the INCLUDE env var had stlport's include dir first... AND IT COMPILED OK the first one... here's a screenshot of the last page of errors. please help me... winstances.obj : error LNK2019: unresolved external symbol "__declspec(dllimport ) public: __thiscall _STL::basic_string<wchar_t,class _STL::char_traits<wchar_t> ,class _STL::allocator<wchar_t> >::basic_string<wchar_t,class _STL::char_traits< wchar_t>,class _STL::allocator<wchar_t> >(wchar_t const *,unsigned int,class _ST L::allocator<wchar_t> const &)" (__imp_??0?$basic_string@_WV?$char_traits@_W@_ST L@@V?$allocator@_W@2@@_STL@@QAE@PB_WIABV?$allocator@_W@1@@Z) referenced in funct ion "public: class _STL::basic_string<wchar_t,class _STL::char_traits<wchar_t>,c lass _STL::allocator<wchar_t> > __fastcall boost::reg_expression<wchar_t,class b oost::regex_traits<wchar_t>,class _STL::allocator<wchar_t> >::str(void)const " ( ?str@?$reg_expression@_WV?$regex_traits@_W@boost@@V?$allocator@_W@_STL@@@boo st@@ QBI?AV?$basic_string@_WV?$char_traits@_W@_STL@@V?$allocator@_W@2@@_STL@@XZ) winstances.obj : error LNK2019: unresolved external symbol "__declspec(dllimport ) public: int __thiscall _STL::basic_string<wchar_t,class _STL::char_traits<wcha r_t>,class _STL::allocator<wchar_t> >::compare(class _STL::basic_string<wchar_t, class _STL::char_traits<wchar_t>,class _STL::allocator<wchar_t> > const &)const " (__imp_?compare@?$basic_string@_WV?$char_traits@_W@_STL@@V?$allocator@_W@2@@ _S TL@@QBEHABV12@@Z) referenced in function "public: int __fastcall boost::reg_expr ession<wchar_t,class boost::regex_traits<wchar_t>,class _STL::allocator<wchar_t> >::compare(class boost::reg_expression<wchar_t,class boost::regex_traits<wchar_ t>,class _STL::allocator<wchar_t> > const &)const " (?compare@?$reg_expression@_ WV?$regex_traits@_W@boost@@V?$allocator@_W@_STL@@@boost@@QBIHABV12@@Z) winstances.obj : error LNK2019: unresolved external symbol "__declspec(dllimport ) public: class _STL::basic_string<wchar_t,class _STL::char_traits<wchar_t>,clas s _STL::allocator<wchar_t> > & __thiscall _STL::basic_string<wchar_t,class _STL: :char_traits<wchar_t>,class _STL::allocator<wchar_t> >::assign(unsigned int,wcha r_t)" (__imp_?assign@?$basic_string@_WV?$char_traits@_W@_STL@@V?$allocator@_W@2@ @_STL@@QAEAAV12@I_W@Z) referenced in function "private: struct boost::re_detail: :re_syntax_base * __fastcall boost::reg_expression<wchar_t,class boost::regex_tr aits<wchar_t>,class _STL::allocator<wchar_t> >::compile_set_aux(class boost::re_ detail::jstack<class _STL::basic_string<wchar_t,class _STL::char_traits<wchar_t> ,class _STL::allocator<wchar_t> >,class _STL::allocator<wchar_t> > &,class boost ::re_detail::jstack<class _STL::basic_string<wchar_t,class _STL::char_traits<wch ar_t>,class _STL::allocator<wchar_t> >,class _STL::allocator<wchar_t> > &,class boost::re_detail::jstack<unsigned long,class _STL::allocator<wchar_t> > &,class boost::re_detail::jstack<class _STL::basic_string<wchar_t,class _STL::char_trait s<wchar_t>,class _STL::allocator<wchar_t> >,class _STL::allocator<wchar_t> > &,b ool,struct boost::re_detail::_narrow_type const &)" (?compile_set_aux@?$reg_expr ession@_WV?$regex_traits@_W@boost@@V?$allocator@_W@_STL@@@boost@@AAIPAUre_sy ntax _base@re_detail@2@AAV?$jstack@V?$basic_string@_WV?$char_traits@_W@_STL@@V?$a lloc ator@_W@2@@_STL@@V?$allocator@_W@2@@42@0AAV?$jstack@KV?$allocator@_W@_STL@@@ 42@0 _NABU_narrow_type@42@@Z) vc71-stlport/boost_regex-vc71-mt-p-1_31.dll : fatal error LNK1120: 49 unresolved externals NMAKE : fatal error U1077: 'link' : return code '0x460' Stop. ---------------------------------- Peace and love, Tweety mitea(a)sympatico.ca - tweety_04_01(a)users.sourceforge.net YahooID: tweety_04_01

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RE: [Boost-users] using boost::shared_ptr with boost::signal
by Ben Hutchings 26 Jul '04

26 Jul '04

Oliver Kowalke <oliver.kowalke(a)t-online.de> wrote: > Hi, > > I want to use boost::shared_ptr with boost::signal. > > class A > { > private: > int _i; > public: > A() : _i( 0) {} > > void operator()( int, std::string & s) > { i+= 1; } > > void operator()( std::string & s, int) > { i+= 2; } > }; > > boost::shared_ptr< A > a( new A() ); > boost::signal< void( int, std::string &) > rsig; > boost::singal< void( std::string &, int) > lsig; > > rsig.connect( a); > lsig.connect( a); > > rsig(0,"called from right side"); > lsig("called from left side",0); > > Because a is a smart_ptr this code would not compile because > operator() is not a member function. If I dereference the smart > pointer when I connect to signal, changes of a are never know > by the other signal instance. > Maybe I can use a proxy class which aggregates the smart pointer > but maybe there is a better solution?! As a general rule, functors are expected to be copiable and not to have mutable state of their own. So how about putting the shared_ptr inside A instead: class A { private: boost::shared_ptr<int> _i; public: A() : _i(new int(0)) {} void operator()(int, std::string & s) { *_i += 1; } void operator()(std::string & s, int) { *_i += 2; } }; A a;

1 0

regex bug (regex_search throws bad_expression)
by Adam Molnar 26 Jul '04

26 Jul '04

hi! using the latest regex patch and vc7.1 i've accidentally encountered the following: ... regex re("([^\n]*\\n+\\s+)+NEEDEDSUBITEM2:[^\\s]"); bool matched = regex_search(text, re); // bad_expression ... i figured out those \\s -s may cause the problem. sample text attached. and one question: having "DATA.*?ITEM1(ITEM2)?" and an input like "DATA ITEM1 ITEM1ITEM2" should ITEM2 be extracted? i think it would be good to make a note on this case in the doc. yours, adam begin 666 match_test.txt M#0I)5$5-5%E014$Z#0H@(" @4U5"251%33$Z('AX> T*#0H@(" @3D5%1$5$ M4U5"251%33$Z(" @('AX>'@-"B @("!.145$141354))5$5-.B @("!X>'AX M#0H-"DE414U465!%0CH-"B @("!354))5$5-,3H@>'AX#0H-"B @("!.145$ M141354))5$5-,3H@(" @>'AX> T*(" @($Y%141%1%-50DE414TR.B @("!X '>'AX#0H-"@`` ` end

3 4

Building boost::fs to a dll
by boost＠dalvander.com 26 Jul '04

26 Jul '04

Is it possible to build boost::filesystem to a dll instead of creating a static linked library? // Anders Dalvander

2 1

C++ Template Metaprogramming
by David Abrahams 25 Jul '04

25 Jul '04

For the past year Aleksey Gurtovoy and I have been working on a new book, titled _C++ Template Metaprogramming: Concepts, Tools and Techniques from Boost and Beyond_. The book has recently entered copyediting. If you're interested you can peruse some sample chapters at http://boost-consulting.com/mplbook. Regards, Dave -- Dave Abrahams Boost Consulting http://www.boost-consulting.com

5 10

Building boost into a single dll
by boost＠dalvander.com 24 Jul '04

24 Jul '04

Is it possible to build all (or some specified) boost libraries into one single dll? // Anders Dalvander

1 0

Newbie -- Regex, Unicode, XCode and MacOSX
by Steve Moore 23 Jul '04

23 Jul '04

Hello. I'm trying to incorporate Unicode regex searching in a little app I'm doing. I'm building using XCode 1.2 on MacOSX 10.3.4. The problem I'm having is that I can't seem to get boost's regex to incorporate unicode or wide-character support. In <boost/config/platform/macos.hpp> there is the line #define BOOST_NO_CWCHAR which seems to disable allowance for unicode by causing boost::wregex and boost::wcmatch symbols to not be typedef-ed. A test app. shows that these symbols are defined when I build using Codewarrior. So I'm wondering how to get unicode support for regex using XCode (gcc) on a MacOSX machine. Any suggestions? Thanks 10^6, STeve Moore.

2 3

Don't seed() mersenne_twister RNG with 0
by Benoît SIBAUD 23 Jul '04

23 Jul '04

Hi, a seed(0) with a mersenne_twister (like mt11213b or mt19937) aborts on some assertion (tested on boost 1.31). boost/random/linear_congruential.hpp:61: boost::random::linear_congruential<IntType, a, c, m, val>::linear_congruential(IntType) [with IntType = uint32_t, IntType a = 69069, IntType c = 0, IntType m = 0, IntType val = 0]: Assertion `c || x0' failed. mersenne_twister::seed(x) calls linear_congruential<uint32_t, 69069, 0, 0, /* unknown */ 0>(x), which asserts(0 || x). So x must be non-zero. I didn't see it in the doc, but I think it would be a good thing to have it written down, or to have mersenne_twister::seed() modified to avoid the assertion. Regards, -- Benoît Sibaud

1 1

filesystem and existing files
by Russell Hind 23 Jul '04

23 Jul '04

With filesystem, you can do filesystem::path P(....); filesystem::ofstream S; if (!filesystem::exists(P)) { S.open(P); } But isn't there a race condition here which could lead to a file created by another process being wiped out, or added to? Is there a way to get ofstream::open to fail if the file already exists? It succeeds on VC7.1 but in some situations I don't want it to succeed. Cheers Russell

2 4