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Boost.Numeric.Interval: Please specify rounding control mechanism.
by Andreas Fabri 15 Mar '07

15 Mar '07

Hello, even with the release candidate for 1_34 I get this error message c:/Boost/include/boost-1_34\boost/numeric/interval/hw_rounding.hpp(38) : fatal error C1189: #error : Boost.Numeric.Interval: Please specify rounding control mechanism. on AMD Turion with XP 64 and VC 2005. Can anybody fix this or give a hint what I have to find out on mt platform to fix it. thanks, andreas

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[mutable_queue] Mutable Queue problem
by Anton A. Patrushev 15 Mar '07

15 Mar '07

Hi, I wonder if there is a way to put edge descriptors into Mutable Queue? So far it looks like it can handle only vertex descriptors. Am I right? Thanks, Anton.

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Re: [Boost-users] SQL library with full embedded SQL-syntax
by Thorsten Ottosen 15 Mar '07

15 Mar '07

Maciej Sobczak wrote: > Hi, > > Jeff Garland wrote: > > >>Well, I'll be brutally honest -- I don't think I would go that >>direction. We didn't pick a database project last year because a >>majority of the mentors agreed that the 'dsl-based' approach was more of >>a toy than reality. The main reason for this is that in 'real-world' >>applications queries are often dynamic and must be built at run-time. > > > The other reason is that in 'real-world' you might want to call stored > procedures instead of manually glued pieces of ad-hoc SQL queries, in > which case the support in the area of query composition is probably not > very useful anyway. In the 'real-world' both things are used. Choosing C++ for a projects where databases are involved is probably rare and Java/C#/Python/Ruby is more likely. C++ doesn't exactly boost productivity, so it has to offer something else to be a condidate. And what can C++ offer? Type safety. -Thorsten

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lambda usage
by Peng Yu 15 Mar '07

15 Mar '07

Hi, It seems that the lambda manual lacks of a simple working example. I'm made up the following example. But it's not working. Could you please show me how to make it work? Thanks, Peng #include <boost/lambda/lambda.hpp> #include <boost/lambda/core.hpp> #include <iostream> using namespace boost::lambda; int main() { std::cout << (_1 + _2)(10, 10) << std::endl; }

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[lamba] Comparing return value of member function with ->*
by Boris 15 Mar '07

15 Mar '07

struct sample { int i; sample(int i) : i(i) { } bool odd() { return i % 2; } }; template <class T, class U> std::basic_ostream<T, U> &operator<<(std::basic_ostream<T, U>& ostr, sample s) { return ostr << s.i; } std::vector<sample> from; std::vector<sample> to; from.push_back(sample(1)); from.push_back(sample(2)); from.push_back(sample(3)); // Why doesn't this compile ... std::for_each(from.begin(), from.end(), if_then((_1 ->* &sample::odd) == false, std::cout << _1)); // ... but this does? Isn't it the same? std::for_each(from.begin(), from.end(), if_then(bind(&sample::odd, _1) == false, std::cout << _1)); Thanks in advance for any explanation which helps me to understand lamba expressions better, Boris

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libraries accepted to boost
by andrzej 15 Mar '07

15 Mar '07

Hello, In the Boost home page I can see a number of libraries were accepted to Boost even more than a year ago. When are they going to be included in the official release? Thanks, &rzej ---------------------------------------------------------------------- Seksowne dziewczyny, szybkie samochody Zobacz >> http://link.interia.pl/f1a28

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How to convert this into lambda expression
by Peng Yu 14 Mar '07

14 Mar '07

Hi, I have the following code which requires a definition of a class "not_fun". I want to replace it with lambda expression. Would you please let me know what the best way would be? Thanks, Peng #include <iostream> template <bool B> class not_fun; template <> struct not_fun<true> { static bool doit(bool x) { return x; } }; template <> struct not_fun<false> { static bool doit(bool x) { return !x; } }; template <bool B> class A { public: A() { } bool compute(bool b) const { if(not_fun<B>::doit(b)) // how replace this with lambda expression? return true; return false; } private: }; int main() { A<true> a; std::cout << a.compute(true) << std::endl; }

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C++ - STL & Shared memory
by Borse, Ganesh 14 Mar '07

14 Mar '07

Hi, I am developing an application with 2 unrelated, arbitary processes having a C++ shared hash map between them to store data. However, I am facing the problem of creating this template hash map in shared memory. Can boost be used for this purpose? Can anybody please suggest me the implementation which can be used to do this? Thanks in advance. Best Regards, Ganesh B. ============================================================================== Please access the attached hyperlink for an important electronic communications disclaimer: http://www.credit-suisse.com/legal/en/disclaimer_email_ib.html ==============================================================================

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SQL library with full embedded SQL-syntax
by Dmitriy Lyfar 14 Mar '07

14 Mar '07

Hi I would like to participate in Google Summer of Code in this year. I reviewed boost projects for last years and found an interesting project, I think. If you go to the link below you will see a short description for that library: http://www.crystalclearsoftware.com/cgi-bin/boost_wiki/wiki.pl?Google_Summe… The goal of this post is to define the main library features, which will be useful for users. Is that library useful for C++ community? If you are using(or have ever used) similar C++ libraries for work with SQL: which of features do you want to have? Also I want to notice one of the biggest beauty of that approach: you can get the compiler to type-check the SQL-expression, what do you think about that? Thank you. Best regards, Lyfar Dmitriy

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how can I explicitly specify the lambda namespace
by Dmitriy Chumack 14 Mar '07

14 Mar '07

hi * In the documentation for lambda library from boost_1_33_1, in section "Getting Started"->"Conventions used in this document" said that in all examples implicitly used such declarations: using namespace std; using namespace boost::lambda; So the following will work: for_each(a.begin(), a.end(), std::cout << _1 << ' '); But how do I have to rewrite the above line of code to have it compiled without "using namespace boost::lambda;" before it? Thanks in advance.

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