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on_error and calc4.cpp
by Xavier Pegenaute 02 Mar '10

02 Mar '10

Hi, I have some question about on_error behavior. - Why the error explanation is only shown when the user changes a number by a some other characters?, may be because there is not rule for "+-/*" ? is it necessary to be a rule to show where the error is? - When is useful to write more than one on_error?, may be when you want to show different messages for each different rule? - What is the rule to use as on_error first parameter?, I guess the most general rule of the parsing zone. Thanks & Regards. Xavi.

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[Proto] Processing literal strings in context
by Steffen Rauh 02 Mar '10

02 Mar '10

Hi all, I am using Boost.Proto with Boost 1.42.0 and Visual Studio 2005/2008. I try to handle literal strings in the context of my DSEL: struct CContext { ... template<> struct eval<CExpression<proto::terminal<const char*>::type> > { typedef void result_type; result_type operator()(CExpression<proto::terminal<const char*>::type> Expr, CContext& Ctx) const { return; } }; ... }; But the eval for literal strings is never matched. Instead the general proto::tag::terminal eval is matched which is defined afterwards. I tried several variations like char const[proto::N] and the like, without success. What am I missing here? A full example follows at the end. Regards, Steffen ------------------------------ #include <iostream> #include <boost/proto/proto.hpp> namespace proto = boost::proto; struct CTerminal; struct CGrammar : proto::or_< proto::shift_right<CGrammar, CGrammar>, proto::terminal<proto::_> > { }; struct CDomain; template <typename TExpr> struct CExpression : proto::extends<TExpr, CExpression<TExpr>, CDomain> { typedef proto::extends<TExpr, CExpression<TExpr>, CDomain> base_type; CExpression(const TExpr& Expr = TExpr()) : base_type(Expr) { } }; struct CDomain : proto::domain<proto::generator<CExpression>, CGrammar> { }; struct CTerminal : CExpression<proto::terminal<int>::type> { typedef proto::terminal<int>::type expr_type; CTerminal() : CExpression<expr_type>(expr_type::make(int(0))) { } template <typename TExpr> void operator=(TExpr& Expr) { CContext Ctx; proto::eval(Expr, Ctx); return; } }; // typedef CExpression<proto::terminal<char const[8]>::type> TLiteralString; // typedef CExpression<proto::terminal<char const[proto::N]>::type> TLiteralString; typedef CExpression<proto::terminal<const char*>::type> TLiteralString; struct CContext { template<typename TExpr, typename Tag = typename TExpr::proto_tag> struct eval { }; template<> struct eval<CTerminal> { typedef void result_type; result_type operator()(const CTerminal& Expr, CContext& Ctx) const { std::cout << "CTerminal\n"; return; } }; // why is the literal string not matched by this eval??? template<> struct eval<TLiteralString> { typedef void result_type; result_type operator()(TLiteralString Expr, CContext& Ctx) const { std::cout << "Literal string \"" << proto::value(Expr) << "\"\n"; return; } }; // instead the literal string matches this template<typename TExpr> struct eval<TExpr, proto::tag::terminal> { typedef void result_type; result_type operator()(const TExpr& Expr, CContext& Ctx) const { std::cout << "*** Terminal \"" << proto::value(Expr) << "\"\n"; std::cout << "*** " << typeid(Expr).name() << "\n"; std::cout << "*** " << typeid(TLiteralString).name() << "\n"; return; } }; template<typename TExpr> struct eval<TExpr, proto::tag::shift_right> { typedef void result_type; result_type operator()(const TExpr& Expr, CContext& Ctx) const { std::cout << "ShiftRight\n"; proto::eval(proto::left(Expr), Ctx); proto::eval(proto::right(Expr), Ctx); return; } }; }; int main(int argc, char* argv[]) { CTerminal Foo, Bar; Foo = Bar >> "keyword"; return 0; } -- Sicherer, schneller und einfacher. Die aktuellen Internet-Browser - jetzt kostenlos herunterladen! http://portal.gmx.net/de/go/atbrowser

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[android] Boost + Android NDK
by Agustín K-ballo Bergé 02 Mar '10

02 Mar '10

I would like to hear from other's experiences on using Boost togheter with Android NDK. Personally, while I have been unable to build Boost, I am successfuly using (pieces of): · Array · Assign · Date Time · Enable If · Flyweight · Function Types · Fusion · GIL · Integer · MPL · Preprocessor · Random · Rational · Spirit (which itself uses Proto) · Tuple · Type Traits as well as the proposed: · Endian · LA (Static Size Linear Algebra) · MSM I was forced to hack code here and there, due to lack of exceptions and RTTI. I also had to add configuration macros for endiannes, and a DateTime related macro to have microsec_clock available. Anyone else would like to share its experience? Particularly, was anyone succesful to build boost on Android? And finally, is there interest in patching Boost to make it more 'Android friendly'? This would also benefit other (possibly embedded) systems which run with exceptions and RTTI turned off. Agustín K-ballo Bergé.-

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Re: [Boost-users] multinomial tree-like container
by Hicham Mouline 02 Mar '10

02 Mar '10

-----Original Message----- >From: "Paul Dugas" [paul(a)dugas.cc] >Date: 02/03/2010 06:06 AM >To: "boost-users" <boost-users(a)lists.boost.org> >Subject: Re: [Boost-users] multinomial tree-like container On Mon, Mar 1, 2010 at 5:53 AM, Hicham Mouline <hicham(a)mouline.org> wrote: >> 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? >Is "Property Tree" what you're looking for? >http://www.boost.org/doc/libs/1_42_0/doc/html/property_tree.html >PD That one looks geared towards reading/writing config. I have no IO to do, just a data structure that resembles a n-ary tree where I may want to apply an algorithm on all the nodes. As far as I could find: 1. Boost.Tree from summer of code 2006 in boost vault, though it seems to have implemented only binary trees 2. ntree.hh from http://tree.phi-sci.com/ seems to be what I want. 3. Boost Graph library is a superset of what I need. Regards,

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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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