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Linking libboost...
by Martin Kardigen 15 Jul '06

15 Jul '06

Hello, I'm using test test libraries from boost to testing my code. I want to create Makefile.am rules for my project but I don't know how to define needed libboost libraries because all of boost libraries have -gcc suffix. What I have to do if I want to have code that would be compiled and linked in other compilers then gcc ??? Where can I find some clues about linking BOOST?

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[mpl] Help with simple algorithm needed
by Stephan Tolksdorf 15 Jul '06

15 Jul '06

Hi I'm trying to build a mpl::vector which looks like [(a,1),(a,2),...,(a,a),(a+1,1),...,(b,b)], where a < b are int's and (x,y) stands for mpl::pair< int_<x>, int_<y> >. The following code does not compile with MSVC 8. Could somebody tell me what's wrong with my code? Does someone have an idea how to solve this problem more elegantly with MPL? Any help is much appreciated. Code snippet with the vector named "ListofNMPairs": template <typename N> struct NPush : mpl::lambda< mpl::push_front< mpl::_1, mpl::pair<N, mpl::_2> > >::type { }; template <typename S> struct MyRange : mpl::reverse_fold< mpl::range_c<int, 1, S::value + 1>, mpl::vector< >, NPush<S> >::type { }; typedef mpl::reverse_fold< mpl::range_c<int, 16, 66>, // a=16, b=65 mpl::vector< >, mpl::insert_range< mpl::_1, mpl::begin<mpl::_1>, MyRange<mpl::_2> > >::type ListofNMPairs; Regards, Stephan

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[iterator] reverse_iterator from iterators that return references to data in self.
by Seb Martel 15 Jul '06

15 Jul '06

Hello, given something like: class ProxyIterator : public boost::iterator_facade<ProxyIterator, Costly, boost::random_access_traversal_tag> { public: ProxyIterator(FactoryOfCostly* pF, int i ) : m_pFactory( pF ), m_index( i ) {} private: friend class boost::iterator_core_access; void decrement() {--m_index;} // ... and others Costly& dereference() const { m_value = m_pFactory->MakeCostlyAtIndex( m_index ); return m_value; } private: FactoryOfCostly* m_pFactory; int m_index; mutable Costly m_value; }; I cannot use this ProxyIterator with a boost::reverse_iterator adaptor because the implementation of reverse_iterator's dereference dereferences a temporary: // from reverse_iterator.hpp typename super_t::reference dereference() const { return *boost::prior(this->base()); } and in ProxyIterator, this dereference returns a reference to an internal member, m_value, that will immediately vanish out of existence. Bummer. What if reverse_iterator carried as member the decremented iterator instead of decrementing to a temporary on a dereference? In the current reverse_iterator implementation, decrement must behave properly on an end iterator, but not on a begin iterator. Can a begin iterator be decremented and still used for comparison purposes? -seb

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force inline
by Artem Alimarine 15 Jul '06

15 Jul '06

Hi all, Is there a macro in boost for something like MSVC __forceinline. Currently I have in the project: #if defined __GNUC__ #define FORCE_INLINE __attribute__((always_inline)) #define NO_INLINE __attribute__((noinline)) #elif defined _MSC_VER #define FORCE_INLINE __forceinline #define NO_INLINE __declspec(noinline) #else //#error "no inlines" #define FORCE_INLINE inline #define NO_INLINE #endif I am wondering whether I can get rid of it and use boost for it? Artem

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boost::lambda performance
by Aleksey Loginov 15 Jul '06

15 Jul '06

Where I can find benchmark sources for boost::lambda?

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Re: [Boost-users] Macro to contruct/allocate a shared_ptr?
by David Klein 15 Jul '06

15 Jul '06

boost-users-bounces(a)lists.boost.org wrote: > Hi Dave. That code went over the top of my head. Do you mind > giving me an example of the usage? > > On 7/14/06, David Klein <d.klein(a)ascaron.com> wrote: >> [snip] >> >>> I just have a problem with having the user manage the memory. >>> ie I'd rather do the following: >>> >>> shared_ptr<Test> p(1, 'a', "hello"); >>> or: >>> shared_ptr<Test> p = newptr<Test>(1, 'a', "hello"); >>> >>> instead of: >>> >>> shared_ptr<Test> p(new p(1, 'a', "hello")); >>> >>> but i guess that's a limitation of the language. to get >> >> hi, >> >> have a look at shared_new.zip in the vault. >> >> http://tinyurl.com/khd8v >> >> -- >> HTH dave well, i just tried to compile the shared_new_test.cc, but it failed using vc71 and vc8 (boost 1.33.1). anyway, its quite similiar to the code Roman Perepelitsa posted. a short example using his newptr: struct X { X( int _x, double _y, const std::string & _z ) { ... } } shared_ptr<X> x = newptr<X>(42, 42.0, "hello world");

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stlport?
by bringiton bringiton 14 Jul '06

14 Jul '06

i'm porting my app so that it now uses stl and boost. can someone please give advise on what stl i should be using? i hear about stlport all the time, but not sure why it is used? ie is it better that the version that comes with the compilers? im using ms vc++ 6 at the moment and plan to upgrade to 7.1. should i use the default stl, or install stlport?

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Spirit based shell command interpreter
by George M. Garner Jr. 14 Jul '06

14 Jul '06

Has anyone implemented a shell command interpreter using the boost spirit library? Yes, I am aware of jam/bjam. There is also a calculator example available on the web and the process doesn't seem all that difficult. I just want to see whether this specific application has already been done (before I reinvent the wheel). Regards, George.

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Re: [Boost-users] Boost Test usage
by Matt Schuckmann 14 Jul '06

14 Jul '06

Actually right now we are using 1.32.0, I've downloaded 1.33.1 but I'll have to convince the rest of my group that it's worth it to update to 1.33.1 or I maybe able to use 1.33.1 just for the test library, I don't know yet. IMO Example 3 doesn't really show building a multilevel hierarchy it just shows how to derive from test_suite and add that to the master test_suite. Yes you could create multiple test_suites and add them together in interesting ways but what does that buy you? Now that I see the detailed report level I see some use for hierarchy's, maybe the documentation should mention this and provide some example output. It took me a while to find the command line documentation you might consider making it stand out more in the documentation and maybe even add a standard "-h --help" option so that the test executables are self documenting, if your using boost::program_options this is pretty easy. Thanks for quick feedback I'll see what I can do. I really hate creating a bunch of executables (especially in MS .NET 2003) but I also don't really want to always run all my tests I'll watch for version 1.35. Thanks Matt S.

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A question about shared_ptr
by Zhuo Hao 14 Jul '06

14 Jul '06

In file <boost/shared_ptr.hpp>, I find the following function: /begin quote template<class Y, class D> shared_ptr(Y * p, D d): px(p), pn(p, d) { detail::sp_enable_shared_from_this( pn, p, p ); } /end quote If I use it as follows:"boost::shared_ptr<Investment> pInv(0,getRidOfInvestment)",it will not compile.But when I use:"boost::shared_ptr<Investment> pInv(static_cast<Investment*>(0),getRidOfInvestment)",it can be compiled. The constructor's first parameter is Y*,i.e.,a pointer to Y.And 0 can be interpreted as a pointer to Y,too. Why can't zero be treated as a pointer to Y here? I will be appreciative if anyone can give me some suggestions.Thank you! hzhuo July,14th

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