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Signal with return value will crash
by WangYun 17 Nov '04

17 Nov '04

Hi, I tried the signals, the code below will crash #include <boost/signal.hpp> int _tmain(int argc, _TCHAR* argv[]) { boost::signal<int(int)> _sig; _sig(10); return 0; } but code below works well #include <boost/signal.hpp> int _tmain(int argc, _TCHAR* argv[]) { boost::signal<void(int)> _sig; _sig(10); return 0; } The only difference is one has return value, the other doesn't, is this a bug or by design? Thanks, Wang Yun

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RE: [Boost-users] Re: Problems with boost::variant
by Simmons, Aaron 16 Nov '04

16 Nov '04

> I'm pretty sure that's an MPL limitation. If you > want to build a vector of more than 10 elements, > you need to > > #include <boost/mpl/vector20.hpp> > > or if you need more than 20 elements, > > #include <boost/mpl/vector30.hpp> I've noticed that the vectorXX.hpp files only allow you to make a vector with exactly that many items. What do you do if you want a vector of, say, 25 items?

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Manual in pdf?
by Daniel Lidström 16 Nov '04

16 Nov '04

Hi, is the manual available in pdf or postscript? Or is there a way to print it? The online manual is not very printer-friendly. -- Daniel

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help getting started with boost::graph
by Andrew Chapman 16 Nov '04

16 Nov '04

Hi everyone, I've got a fairly simple use for boost::graph, and I've been trying to get it working, but the documentation, whilst thorough, isn't being too helpful in getting me started. What I'm trying to do, is build a graph of polygon mesh edges, which are simply pairs of unsigned ints. I need to find contiguous edge lists. Here's the setup code: // setup graph typedef std::pair<int, int> Edge; typedef adjacency_list<vecS, vecS, undirectedS> Graph; Graph g; // add an edge add_edge(6,7, g); cout << "Total number of vertices: " << num_vertices(g) << endl; Which then outputs that I have 8 vertices in my graph (0 through 7), instead of just the one I've added. So, it appears that the vertex list is automatically managed to be contiguous. Should I instead be adding all my edges, not caring about their vertex index, and adding a per-vertex property to keep track of their associated polygon mesh vertex numbers? If so, then I presume my code for adding the edges becomes something like (only psuedo-code here): vertex_descriptor v1 = add_vertex(g); vertex_descriptor v2 = add_vertex(g); set_property(v1, MyIndexProperty, 6); set_property(v2, MyIndexProperty, 7); add_edge(v1,v2,g); ..instead of what I had: add_edge(6,7, g); Does that sound right? In that case, is there a quick way of locating vertex_descriptor in a graph based on a vertex property? Something like: find_vertex(g, MyIndexProperty, 6); Sorry for all the lack of understanding, but it is quite a simple thing I'm wanting to use the library for, and I'm finding the documentation quite overwhelming. I suppose it is intended for when you're using the graphs in a much more complex scenario. Thanks in advance for any tips. AC.

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Problems with boost::variant
by Alex Drummond 16 Nov '04

16 Nov '04

Hi, I'm using boost 1.31.0 and I'm having some trouble using type sequences with boost::variant. There seems to be an arbitrary limit on their length. For example, the following code compiles: [---------------------------------------- #include <boost/variant.hpp> #include <boost/mpl/vector.hpp> typedef boost::mpl::vector< boost::recursive_wrapper<struct A> > T0; typedef boost::mpl::push_front<T0, boost::recursive_wrapper<struct B> >::type T1; typedef boost::mpl::push_front<T1, boost::recursive_wrapper<struct C> >::type T2; typedef boost::mpl::push_front<T2, boost::recursive_wrapper<struct D> >::type T3; typedef boost::mpl::push_front<T3, boost::recursive_wrapper<struct E> >::type T4; typedef boost::mpl::push_front<T4, boost::recursive_wrapper<struct F> >::type T5; typedef boost::mpl::push_front<T5, boost::recursive_wrapper<struct G> >::type T6; typedef boost::mpl::push_front<T6, boost::recursive_wrapper<struct H> >::type T7; typedef boost::mpl::push_front<T7, boost::recursive_wrapper<struct I> >::type T8; typedef boost::make_variant_over<T8>::type Var; struct A { Var v; }; struct B { Var v; }; struct C { Var v; }; struct D { Var v; }; struct E { Var v; }; struct F { Var v; }; struct G { Var v; }; struct H { Var v; }; struct I { Var v; }; int main() { return 0; } ----------------------------------------] But with the addition of one more type to the sequence: [---------------------------------------- typedef boost::mpl::push_front<T8, boost::recursive_wrapper<struct J> >::type T9; ...... struct J { Var v; } ----------------------------------------] And an appropriate redefinition of Var: typedef boost::make_variant_over<T9>::type Var; gcc 3.3.3 gives various obscure template error messages: /usr/include/boost/mpl/apply_if.hpp: In instantiation of `boost::mpl::push_front<boost::mpl::vector10<boost::recursive_wrapper<J>, boost::recursive_wrapper, boost::recursive_wrapper<H>, boost::recursive_wrapper<G>, boost::recursive_wrapper<F>, boost::recursive_wrapper<E>, boost::recursive_wrapper<D>, boost::recursive_wrapper<C>, boost::recursive_wrapper, boost::recursive_wrapper<A> >, boost::detail::variant::backup_holder<void*> >': /usr/include/boost/mpl/apply_if.hpp:39: instantiated from `boost::mpl::apply_if<boost::variant<boost::detail::variant::over_sequence<T9>, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_>::has_fallback_type_, boost::mpl::identity<T9>, boost::mpl::push_front<boost::mpl::vector10<boost::recursive_wrapper<J>, boost::recursive_wrapper, boost::recursive_wrapper<H>, boost::recursive_wrapper<G>, boost::recursive_wrapper<F>, boost::recursive_wrapper<E>, boost::recursive_wrapper<D>, boost::recursive_wrapper<C>, boost::recursive_wrapper, boost::recursive_wrapper<A> >, boost::detail::variant::backup_holder<void*> > >' /usr/include/boost/variant/variant.hpp:226: instantiated from `boost::detail::variant::make_storage<boost::mpl::vector10<boost::recursive_wrapper<J>, boost::recursive_wrapper, boost::recursive_wrapper<H>, boost::recursive_wrapper<G>, boost::recursive_wrapper<F>, boost::recursive_wrapper<E>, boost::recursive_wrapper<D>, boost::recursive_wrapper<C>, boost::recursive_wrapper, boost::recursive_wrapper<A> >, boost::variant<boost::detail::variant::over_sequence<T9>, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_>::has_fallback_type_>' /usr/include/boost/variant/variant.hpp:1079: instantiated from `boost::variant<boost::detail::variant::over_sequence<T9>, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_>' test.cc:19: instantiated from here /usr/include/boost/mpl/apply_if.hpp:39: error: base class ` boost::mpl::push_front_traits<boost::mpl::aux::vector_tag<10> >::algorithm<boost::mpl::vector10<boost::recursive_wrapper<J>, boost::recursive_wrapper, boost::recursive_wrapper<H>, boost::recursive_wrapper<G>, boost::recursive_wrapper<F>, boost::recursive_wrapper<E>, boost::recursive_wrapper<D>, boost::recursive_wrapper<C>, boost::recursive_wrapper, boost::recursive_wrapper<A> >, boost::detail::variant::backup_holder<void*> >' has incomplete type /usr/include/boost/mpl/apply_if.hpp: In instantiation of `boost::mpl::apply_if<boost::variant<boost::detail::variant::over_sequence<T9>, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_>::has_fallback_type_, boost::mpl::identity<T9>, boost::mpl::push_front<boost::mpl::vector10<boost::recursive_wrapper<J>, boost::recursive_wrapper, boost::recursive_wrapper<H>, boost::recursive_wrapper<G>, boost::recursive_wrapper<F>, boost::recursive_wrapper<E>, boost::recursive_wrapper<D>, boost::recursive_wrapper<C>, boost::recursive_wrapper, boost::recursive_wrapper<A> >, boost::detail::variant::backup_holder<void*> > >': /usr/include/boost/variant/variant.hpp:226: instantiated from `boost::detail::variant::make_storage<boost::mpl::vector10<boost::recursive_wrapper<J>, boost::recursive_wrapper, boost::recursive_wrapper<H>, boost::recursive_wrapper<G>, boost::recursive_wrapper<F>, boost::recursive_wrapper<E>, boost::recursive_wrapper<D>, boost::recursive_wrapper<C>, boost::recursive_wrapper, boost::recursive_wrapper<A> >, boost::variant<boost::detail::variant::over_sequence<T9>, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_>::has_fallback_type_>' /usr/include/boost/variant/variant.hpp:1079: instantiated from `boost::variant<boost::detail::variant::over_sequence<T9>, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_>' test.cc:19: instantiated from here /usr/include/boost/mpl/apply_if.hpp:39: error: no type named `type' in `struct boost::mpl::push_front<boost::mpl::vector10<boost::recursive_wrapper<J>, boost::recursive_wrapper, boost::recursive_wrapper<H>, boost::recursive_wrapper<G>, boost::recursive_wrapper<F>, boost::recursive_wrapper<E>, boost::recursive_wrapper<D>, boost::recursive_wrapper<C>, boost::recursive_wrapper, boost::recursive_wrapper<A> >, boost::detail::variant::backup_holder<void*> >' /usr/include/boost/variant/variant.hpp: In instantiation of `boost::detail::variant::make_storage<boost::mpl::vector10<boost::recursive_wrapper<J>, boost::recursive_wrapper, boost::recursive_wrapper<H>, boost::recursive_wrapper<G>, boost::recursive_wrapper<F>, boost::recursive_wrapper<E>, boost::recursive_wrapper<D>, boost::recursive_wrapper<C>, boost::recursive_wrapper, boost::recursive_wrapper<A> >, boost::variant<boost::detail::variant::over_sequence<T9>, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_>::has_fallback_type_>': /usr/include/boost/variant/variant.hpp:1079: instantiated from `boost::variant<boost::detail::variant::over_sequence<T9>, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_>' test.cc:19: instantiated from here /usr/include/boost/variant/variant.hpp:226: error: no type named `type' in ` struct boost::mpl::apply_if<boost::variant<boost::detail::variant::over_sequence<T9>, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_>::has_fallback_type_, boost::mpl::identity<T9>, boost::mpl::push_front<boost::mpl::vector10<boost::recursive_wrapper<J>, boost::recursive_wrapper, boost::recursive_wrapper<H>, boost::recursive_wrapper<G>, boost::recursive_wrapper<F>, boost::recursive_wrapper<E>, boost::recursive_wrapper<D>, boost::recursive_wrapper<C>, boost::recursive_wrapper, boost::recursive_wrapper<A> >, boost::detail::variant::backup_holder<void*> > >' /usr/include/boost/variant/variant.hpp:230: error: no type named `type' in ` struct boost::mpl::apply_if<boost::variant<boost::detail::variant::over_sequence<T9>, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_>::has_fallback_type_, boost::mpl::identity<T9>, boost::mpl::push_front<boost::mpl::vector10<boost::recursive_wrapper<J>, boost::recursive_wrapper, boost::recursive_wrapper<H>, boost::recursive_wrapper<G>, boost::recursive_wrapper<F>, boost::recursive_wrapper<E>, boost::recursive_wrapper<D>, boost::recursive_wrapper<C>, boost::recursive_wrapper, boost::recursive_wrapper<A> >, boost::detail::variant::backup_holder<void*> > >' /usr/include/boost/variant/variant.hpp:236: error: no type named `type' in ` struct boost::mpl::apply_if<boost::variant<boost::detail::variant::over_sequence<T9>, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_>::has_fallback_type_, boost::mpl::identity<T9>, boost::mpl::push_front<boost::mpl::vector10<boost::recursive_wrapper<J>, boost::recursive_wrapper, boost::recursive_wrapper<H>, boost::recursive_wrapper<G>, boost::recursive_wrapper<F>, boost::recursive_wrapper<E>, boost::recursive_wrapper<D>, boost::recursive_wrapper<C>, boost::recursive_wrapper, boost::recursive_wrapper<A> >, boost::detail::variant::backup_holder<void*> > >' /usr/include/boost/variant/variant.hpp:252: error: no type named `type' in ` struct boost::mpl::apply_if<boost::variant<boost::detail::variant::over_sequence<T9>, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_>::has_fallback_type_, boost::mpl::identity<T9>, boost::mpl::push_front<boost::mpl::vector10<boost::recursive_wrapper<J>, boost::recursive_wrapper, boost::recursive_wrapper<H>, boost::recursive_wrapper<G>, boost::recursive_wrapper<F>, boost::recursive_wrapper<E>, boost::recursive_wrapper<D>, boost::recursive_wrapper<C>, boost::recursive_wrapper, boost::recursive_wrapper<A> >, boost::detail::variant::backup_holder<void*> > >' /usr/include/boost/variant/variant.hpp: In instantiation of `boost::variant<boost::detail::variant::over_sequence<T9>, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_>': test.cc:19: instantiated from here /usr/include/boost/variant/variant.hpp:1079: error: no type named `type' in ` struct boost::detail::variant::make_storage<boost::mpl::vector10<boost::recursive_wrapper<J>, boost::recursive_wrapper, boost::recursive_wrapper<H>, boost::recursive_wrapper<G>, boost::recursive_wrapper<F>, boost::recursive_wrapper<E>, boost::recursive_wrapper<D>, boost::recursive_wrapper<C>, boost::recursive_wrapper, boost::recursive_wrapper<A> >, boost::variant<boost::detail::variant::over_sequence<T9>, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_>::has_fallback_type_>' /usr/include/boost/variant/variant.hpp:1118: error: no type named `type' in ` struct boost::detail::variant::make_storage<boost::mpl::vector10<boost::recursive_wrapper<J>, boost::recursive_wrapper, boost::recursive_wrapper<H>, boost::recursive_wrapper<G>, boost::recursive_wrapper<F>, boost::recursive_wrapper<E>, boost::recursive_wrapper<D>, boost::recursive_wrapper<C>, boost::recursive_wrapper, boost::recursive_wrapper<A> >, boost::variant<boost::detail::variant::over_sequence<T9>, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_>::has_fallback_type_>' I'd be grateful for any help... Thanks Alex -- "What possible harm could one insane mutant tentacle do?"

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bind forwarding problem
by Trent Hill 16 Nov '04

16 Nov '04

Hi all, I'm running into a compile error using bind with visual c++ 7.1 and am hoping some clever cookie here will be able to help. I've whittled the issue down to a few simple functions (you'll have to trust that it makes sense in the original context): template <typename T_Param> void foo(T_Param a_param) { } template <typename T_Param> void callFooWith(T_Param a_param) { boost::bind(&foo<T_Param>, a_param)(); // <- (1) ERROR HERE } void bar(int) { } int main(int a_argc, char *a_argv[]) { callFooWith(42); // <- (2) FINE callFooWith(boost::bind(&bar, 10)); // <- (3) FAILS return 0; } If I remove line (3), it compiles without error. Adding line (3) results in a compile error reported at line (1) (error is at bottom of post). The compile error seems to stem from operator() on line (1); if the "()" is removed from line (1), the code will compile without error. Any ideas? Thanks a bunch, Trent. *** Error message follows *** c:/workspace\swlib2\BOOST\1.30.2\win32\files\boost\bind.hpp(186) : error C2664: 'void (T_Param)' : cannot convert parameter 1 from 'boost::_bi::result_traits<R,F>::type' to 'boost::_bi::bind_t<R,F,L>' with [ T_Param=boost::_bi::bind_t<void,void (__cdecl *)(int),boost::_bi::list1<boost::_bi::list_av_1<int>::B1>> ] and [ R=void, F=void (__cdecl *)(int) ] and [ R=void, F=void (__cdecl *)(int), L=boost::_bi::list1<boost::_bi::list_av_1<int>::B1> ] Expressions of type void cannot be converted to other types c:/workspace\swlib2\BOOST\1.30.2\win32\files\boost\bind\bind_template.hpp(21) : see reference to function template instantiation 'R boost::_bi::list1<A1>::operator ()<boost::_bi::bind_t<R,F,L>::result_type,void(__cdecl *)(T_Param),boost::_bi::list0>(boost::_bi::type<T>,void,A &) const' being compiled with [ R=boost::_bi::bind_t<void,void (__cdecl *)(int),boost::_bi::list1<boost::_bi::list_av_1<int>::B1>>::result_type, A1=boost::_bi::list_av_1<boost::_bi::bind_t<void,void (__cdecl *)(int),boost::_bi::list1<boost::_bi::list_av_1<int>::B1>>>::B1, F=void (__cdecl *)(int), L=boost::_bi::list1<boost::_bi::list_av_1<int>::B1>, T_Param=boost::_bi::bind_t<void,void (__cdecl *)(int),boost::_bi::list1<boost::_bi::list_av_1<int>::B1>>, T=boost::_bi::bind_t<void,void (__cdecl *)(int),boost::_bi::list1<boost::_bi::list_av_1<int>::B1>>::result_type, A=boost::_bi::list0 ] c:/workspace\swlib2\BOOST\1.30.2\win32\files\boost\bind\bind_template.hpp(19) : while compiling class-template member function 'boost::_bi::bind_t<R,F,L>::result_type boost::_bi::bind_t<R,F,L>::operator ()(void)' with [ R=void, F=void (__cdecl *)(boost::_bi::bind_t<void,void (__cdecl *)(int),boost::_bi::list1<boost::_bi::list_av_1<int>::B1>>), L=boost::_bi::list1<boost::_bi::list_av_1<boost::_bi::bind_t<void,void (__cdecl *)(int),boost::_bi::list1<boost::_bi::list_av_1<int>::B1>>>::B1> ] c:/workspace\ main.cpp(36) : see reference to class template instantiation 'boost::_bi::bind_t<R,F,L>' being compiled with [ R=void, F=void (__cdecl *)(boost::_bi::bind_t<void,void (__cdecl *)(int),boost::_bi::list1<boost::_bi::list_av_1<int>::B1>>), L=boost::_bi::list1<boost::_bi::list_av_1<boost::_bi::bind_t<void,void (__cdecl *)(int),boost::_bi::list1<boost::_bi::list_av_1<int>::B1>>>::B1> ] c:/workspace\ main.cpp(46) : see reference to function template instantiation 'void callFooWith<boost::_bi::bind_t<R,F,L>>(T_Param)' being compiled with [ R=void, F=void (__cdecl *)(int), L=boost::_bi::list1<boost::_bi::list_av_1<int>::B1>, T_Param=boost::_bi::bind_t<void,void (__cdecl *)(int),boost::_bi::list1<boost::_bi::list_av_1<int>::B1>> ]

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Q: BOOST.TEST VC7 mt gd worked on 1.30, fails on 1.31
by Dan Dimerman 16 Nov '04

16 Nov '04

Hello, I just wanted to ask about your experience with the latest (1.31) Boost.Test module. I had several unit tests written with Boost 1.30, and they worked fine. Now I upgraded to 1.31 and the unit test fails in a weird way: It seems to crash while DEALLOCATING the unit tests themselves. Call stack shows it fails on an ASSERT in <xmemory> void deallocate( pointer _Ptr, size_type ). Debugger shows that _ptr points to one of my unit test functions. I am linking with libboost_unit_test_framework-vc7-mt-gd-1_31.lib, libboost_date_time-vc7-mt-gd-1_31.lib, and xerces-c_2.lib (among others). Code generation: Multi-threaded Debug (/MTd). Any help would be appreciated... Thanks in advance.

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install-name for OS X dylibs
by goochrules! 15 Nov '04

15 Nov '04

I was unable to find any reference to this on boost.org or in the mailing lists, so... Is there any way to specifiy the '-install_name' for ld to use when building boost for OS X? I see that currently the relative path to some sort of staging area in effect is used, for example, for libboost_thread-1_31.dylib, otool -L returns (among others): > otool -L libboost_thread-1_31.dylib libboost_thread-1_31.dylib: bin/boost/libs/thread/build/libboost_thread.dylib/darwin/release/shared-linkable-true/libboost_thread-1_31.dylib (compatibility version 0.0.0, current version 0.0.0) Alternatively, I suppose I could link the .o files (in $boost/bin/boost/thread/build/libboost_thread.dylib/darwin/release/shared-linkable-true/) manually; is there anything I should look out for if I choose this path? Are there any other object files I need to include? -- Matthew Peltzer -- goochrules(a)gmail.com

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boost bind question, can it create a functor with more arguments than needed 2
by gast 128 15 Nov '04

15 Nov '04

Dear All, Thank you this works! Didn't expect this... Wkr, me _________________________________________________________________ FREE pop-up blocking with the new MSN Toolbar - get it now! http://toolbar.msn.com/

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Boost and VC++: cannot open file 'libboost_date_time-vc71-mt-sgd-1_31.lib'
by Christopher Athaide 15 Nov '04

15 Nov '04

I have just started using the Boost libraries in VC++.NET - Please bear with me if this seems too simple. I am having trouble compiling this simple class library. //------------------------------------------------- #include "boost/date_time/gregorian/gregorian.hpp" #include "boost/date_time/date_parsing.hpp" namespace First { typedef boost::gregorian::date customDate; } //------------------------------------------------- I get the error message: "cannot open file 'libboost_date_time-vc71-mt-sgd-1_31.lib' " I saw the note by John Maddock and I tried to include this code at the start of the file but it did not help. // // Automatically link to the correct build variant where possible. // #if !defined(BOOST_ALL_NO_LIB) && !defined(BOOST_WHATEVER_NO_LIB) && !defined(BOOST_WHATEVER_SOURCE) // // Set the name of our library, this will get undef'ed by auto_link.hpp // once it's done with it: // #define BOOST_LIB_NAME boost_whatever // // If we're importing code from a dll, then tell auto_link.hpp about it: // #if defined(BOOST_ALL_DYN_LINK) || defined(BOOST_WHATEVER_DYN_LINK) # define BOOST_DYN_LINK #endif // // And include the header that does the work: // #include <boost/config/auto_link.hpp> #endif // auto-linking disabled Clearly I am missing something (maybe quite simple.) I appreciate any help in this matter. Thanks Chris

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