March 2010 - Boost-users - lists.preview.boost.org

Boost Bind
by Etienne Pretorius 02 Mar '10

02 Mar '10

Hello List, I am trying to use boost::signals with boost bind... but I always get this compiler error: 1>c:\program files\boost\boost_1_42\boost\bind\bind.hpp(69) : error C2825: 'F': must be a class or namespace when followed by '::' 1> c:\program files\boost\boost_1_42\boost\bind\bind_template.hpp(15) : see reference to class template instantiation 'boost::_bi::result_traits<R,F>' being compiled 1> with 1> [ 1> R=boost::_bi::unspecified, 1> F=__w64 long (__stdcall ticketman::Window::* )(UINT,WPARAM,LPARAM) 1> ] I am unable to make sence of it... /*CODE*/ /* boost::signal masqurading as a Window Procedure */ static boost::signal<::LRESULT (::HWND,::UINT,::WPARAM,::LPARAM)> WindowProc; /* Window Procedure */ ::LRESULT CALLBACK WndProc( ::HWND hWnd, ::UINT message, ::WPARAM wParam, ::LPARAM lParam ) { return WindowProc(hWnd, message, wParam, lParam); }; class Window : public boost::noncopyable { public: /* Deconstructor */ ~Window( ) { WindowProc.disconnect(m_Connection); }; private: friend ::LRESULT CALLBACK WndProc(::HWND, ::UINT, ::WPARAM, ::LPARAM); virtual ::LRESULT CALLBACK WndProc(::UINT, ::WPARAM, ::LPARAM) = 0; protected: /* Constructor */ Window( ::HINSTANCE hInstance ) : m_Window(NULL) { m_Connection = WindowProc.connect( boost::bind( &Window::WndProc, this, _1, _2, _3 ) ); m_Instance = hInstance;//Might need some work... }; /* Varibles */ static ::HINSTANCE m_Instance; ::HWND m_Window; boost::signals::connection m_Connection; }; I have tried enabling WIN_API for boost and also trying to turn the pure virtual method into a method... still no luck. Thank you, Etienne

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multinomial tree-like container
by Hicham Mouline 02 Mar '10

02 Mar '10

Hello, Is there a library that provides a public container that has the structure of a tree where there are top nodes, and each node can have 0 to N children? regards,

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Creating a map between two sets of classes
by Gokulakannan Somasundaram 02 Mar '10

02 Mar '10

Hi, I have a requirement where in i have a set of classes and they have a one on one correspondence with another set of classes. Consider something like this a) template<class A> class Walkers { int walk( Context<A>* context ); }; The set of Context classes are not templates. They are individual classes. I need to create a mapping between these two sets. One way, i could think of is to create a typelist and refer to the class at the appropriate location. But i feel that is more error prone, as i may mismatch the Contexts in the typelist. Can someone advise me how to do this using any of the boost libraries? Thanks, Gokul.

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Bug: boost 1.42 doesn't download a .lib
by Trevin Murakami 02 Mar '10

02 Mar '10

I finally had to grab this manually from SourceForge. For some reason the installer won't grab libboost_unit_test_framework-vc90-mt-s-1_42.lib, and I needed it. This was while setting it to download everything for VC90 and manually trying to set it to download all files for the Boost Unit Test Framework. -Trevin "2 hours of downloading through a tool, 15 minutes SourceForge search" Murakami

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Using the Boost Preprocessor
by Rowan Sylvester-Bradley 02 Mar '10

02 Mar '10

I've got an application where I need to generate a lot of repetitive sections of 8051 assembler code. For this I need a pre-processor or macro processor that has facilities for iteration and/or recursion. I'm currently using a stand-alone C preprocessor (MCPP) to do conditional assembly etc., and someone suggested that the Boost pre-processor library might give me the facilities I need for these repetitive code sections. What do I have to download to get just the preprocessor libraries? Also, can I use these libraries with any C or C++ preprocessor (such as MCPP), or do I need something specific? I guess this boils down to - does the Boost librbary use any compiler/preprocessor featires that I wouldn't find in a standard C preprocessor? Thanks for your help. These questions arise because I'm not using C or C++, so the rest of Boost is presumably of no use to me - I just need the preprocessor bit. I'm using Windows Vista, so any tools need to be Windows compatible... Thanks - Rowan

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Boost.Test 1.42 --report_sink="path with spaces"
by Chris Hoeppler 01 Mar '10

01 Mar '10

Hi, when calling some my_unit_test module with my_unit_test --report_level=detailed --report_sink="foo bar" then the report isn't written to a file "foo bar" but to a file "foo". Is there any way to pass a path containing spaces to the report_sink option? Regards Chris

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Boost.Log formal review upcoming
by Vladimir Prus 01 Mar '10

01 Mar '10

Boosters, the formal review of the Boost.Log library, written by Andrey Semashev, will start in a week from now, on March 8, 2010 and will run through March 17, 2010. The documentation for the current version is available at: http://boost-log.sourceforge.net The downloads at at: http://sourceforge.net/projects/boost-log Because the library is relatively big and important, you might want to take a look in advance, without waiting for the formal review. Please note that reports of real-world usage will be particularly appreciated -- even if you don't have the time to to do everything formal review checklist requires please still report your experiences. To clarify timelines, the formal reviews are accepted from 23:59, March 7, PST = 2:59, March 8, EST = 7:59 March 8, GMT = 10:59, March 8 MSK until 23:59, March 17, PST = 2:59, March 18, EST = 7:59 March 18, GMT = 10:59, March 18 MSK Reviews submitted outside of this frame are not guaranteed to be processed. Thanks, Volodya

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[GIL] Status of Ticket #2831?
by Olivier Tournaire 01 Mar '10

01 Mar '10

Hi, A colleague of mine opened a ticket more than a year ago ( https://svn.boost.org/trac/boost/ticket/2831) for a GIL defect. In fact, the custom color converter for color_converted_view on any_view is not plugged. The problem is also described in the title of the ticket. What is the status of this ticket? The changes are very simple, and are still not done in 1.42 version. Instead of: template <typename DstP, typename Result> struct color_converted_view_fn { typedef Result result_type; template <typename View> result_type operator()(const View& src) const { return result_type(color_converted_view<DstP>(src)); } }; There should be: template <typename DstP, typename Result, typename CC = default_color_converter> struct color_converted_view_fn { typedef Result result_type; color_converted_view_fn(CC cc = CC()): _cc(cc) {} template <typename View> result_type operator()(const View& src) const { return result_type(color_converted_view<DstP>(src, _cc)); } private: CC _cc; }; Best regards. Olivier

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[regex] wildcard matching byte not character
by Richard Clokie 01 Mar '10

01 Mar '10

Hi all I'm having trouble with the behaviour of the wildcard character when using boost regex and unicode strings. I would expect a . to match a character, not a byte, but that's not the behaviour I'm seeing. I would have thought one wildcard would match any previous character, but for multi-byte characters in UTF-8 I have to use multiple wildcards to match them. I would appreciate it if someone could explain whether this is expected behaviour or not, or if there are flags that control this. What I'm trying to accomplish is to match a pattern (in UTF-8 ) against a string (in UTF-8). I'm creating icu UnicodeStrings since I'm having other problems with straight UTF-8 char*s and my platform doesn't support w_chars. I can show examples of the non-UnicodeString problems if desired. I'm using 1.42 Test program follows - output is: $ g++ regex2.cc -l icui18n -l icuuc -l icudata -lboost_regex -o example && ./example unicodeString tests failed Success! ---- #include <iostream> #include <boost/regex.hpp> #include <boost/regex/icu.hpp> using namespace boost; using namespace std; int main(){ static const char input[]={0xC2,0xA3, 0xC3,0x98, 0xC2,0xB2, 0 }; UnicodeString uInput(input); const char match1[] = {0xC2,0xA3,0x2E,0xC2,0xB2, 0} ; // one . const char match2[] = {0xC2,0xA3,0x2E,0x2E,0xC2,0xB2, 0} ; // two .s UnicodeString uMatch1(match1); UnicodeString uMatch2(match2); u16match what; cout << "unicodeString tests" << endl; if(u32regex_search( uInput , what, // one . fails make_u32regex(uMatch1,regex::extended))) { cout << "Success!" << endl; } else { cout << "failed" << endl; } if(u32regex_search( uInput , what, // two . succeeds make_u32regex(uMatch2,regex::extended))) { cout << "Success!" << endl; } else { cout << "failed" << endl; } }

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[GIL new_io] Some questions about TIFF handling
by Olivier Tournaire 01 Mar '10

01 Mar '10

Hi all (and in particular Christian), I have some questions about TIFF reader/writer in GIL new_io. First, I do not understand why *bits32f* are scoped in the range [0.f ... 1.f]. It is for our applications a real limitation because we use float TIFF images not scoped in the range. We thus have to define a new type (e.g. bits32F) which is not scoped and simply typedef float bits32F. In addition, why double is not "typedefed" by default? We also have to define a new type: typedef double bits64f. Double however seems to be supported in the writer. Last, but not least, there is no support for *tiled TIFF*. Nothing about tiled TIFF is defined in tiff_tags.hpp. Maybe we could add in tiff_device_base a read_tile method, similar to read_scaline (sic), but which simply swap TIFFReadScanline with TIFFReadTile. So, do you plan to add this stuffs in the new version of GIL io? Maybe I could help. Let me know. Best regards, Olivier

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