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[Format] Asserts with non-default structure packing in 1.37 (MSVC)
by Daniel James 31 Dec '08

31 Dec '08

I'm using MS Visual Studio 2005 to work on some legacy code that has its origins back in 16-bit Windows, and relies on the /Zp2 switch to align fields in structures in the same way as earlier versions. One of the more recent modules uses boost::format, and this has compiled correctly and been working with Boost 1.34.1. I'm trying to bring the project up-to-date using 1.37, and I am getting BOOST_STATIC_ASSERT reports when I include boost/format.hpp. I don't have to *use* format in my code, just including boost/format.hpp in a "Hello world" program is sufficient to trigger the error when using /Zp2 Is this to be expected? Is there a workaround? I know we should really use explicit pack pragmas around the structures that have to be packed in this particular way, but there are too many of them -- and they're defined all over the code -- for this to be a simple or safe process ... /Zp2 has always worked fine in the past. Cheers, Daniel (Just a user -- not to be confused with the Boost contributor of the same name)

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Re: [Boost-users] [lambda] Should the code compile?
by Max 31 Dec '08

31 Dec '08

Hello Watanabe, It seems to be a problem of my mail editor. I have used the correct static_cast grammar but some characters were silently eaten. :-( Sorry for misleading. At last, I've found the problem and the working code is as follows: #define DECLARE_PTR_AUTO_DELETOR_CONDITIONAL(CLASS, VAR_PTR, CONDITION)\ boost::scoped_ptr<CLASS> auto__deletor__for__ ## VAR_PTR (\ (boost::lambda::if_then_else_return(boost::lambda::_1, VAR_PTR,\ static_cast<CLASS*>(0))) (CONDITION)) I should use if_then_else_return instead of if_then_else. Thanks for help. B/Rgds Max ----- Original Message ----- From: Steven Watanabe <watanabesj(a)gmail.com> To: boost-users(a)lists.boost.org Subject: Re: [Boost-users] [lambda] Should the code compile? Date: 2008-12-31 00:51:01 AMDG Max wrote: > I have the following simple code, but doesn't get compiled: > > #define DECLARE_PTR_AUTO_DELETOR_CONDITIONAL(CLASS, VAR_PTR, CONDITION)\ > boost::scoped_ptr auto__deletor__for__ ## VAR_PTR (\ > boost::lambda::ret(boost::lambda::if_then_else(_1,\ > VAR_PTR, static_cast(0)))(static_cast(CONDITION))) > That's not the correct syntax for static_cast In Christ, Steven Watanabe ------------------------------------------------------------------- 新浪空间——与朋友开心分享网络新生活！(http://space.sina.com.cn/ )

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Passing signals as functions
by Remko Tronçon 30 Dec '08

30 Dec '08

Hi, I have a signal boost::signal<void ()> foo that I would like to pass to a function taking a function<void ()>. Currently, I pass the pointer to a helper function that calls foo(), but I suspect there's an easier way. Same goes for the more advanced case, where i have a signal boost::signal<void (Bar)> foo which i would like to the same function (taking a function<void ()>), after binding the signal parameter to a specific value. Does anyone know how to do this as well? thanks, Remko

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[unit test] enable_if in MSVC
by n e 30 Dec '08

30 Dec '08

Hello, I am using static link to boost.test in my project. Using that gives about 50 errors in MSVC compiler. I tried excluding enable_if header with defining that before unit_test inclusion and that seems to work. Is there any better ways to handle that? By the way I use version 1.35 .lib file linked to project. Thanks in advance.

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Re: [Boost-users] [Serialization]Can not export polymorphic types
by Daniel Roberts 30 Dec '08

30 Dec '08

That works. Some things I notice: 1) The xml file created has an attribute in the object tag called "class_name", containing the name of the derived type. This attribute does not exist in an xml file created using derived type pointers. I guess this is the critical piece of information needed to reconstruct a derived type using a base class pointer. 2) It also works if you create a derived class pointer/object, static_cast the derived type pointer to a base class pointer and pass the base class pointer to the serialization. 3) someInXMLArchive >> boost::serialization::make_nvp("", someTypePtr); works, which is surprising since I am passing an empty string for a tag. It appears serializing in ignores tag names and just processes data until the class is constructed or a stream error occurs. 4) Calling close on the output file stream (e.g. std::ofstream::close) causes the closing boost_serialization tag, </boost_serialization> to NOT be written to the file. Is this an issue that needs to be resolved or am I doing something else wrong? Thanks a bunch for all the help. Hopefully I'll be running on my own now. Please feel free to comment on my observations above, however. Regards, Daniel Roberts What happens if you try the following: TestBase * pT1 = new TestType1; TestBase* pT2 = new TestType2; testOutXML << boost::serialization::make_nvp("pT1", pT1); testOutXML << boost::serialization::make_nvp("pT2", pT2); testTypeOFS.close(); delete pT1; delete pT2; ... testInXML >> boost::serialization::make_nvp("pT1", pTB); testInXML >> boost::serialization::make_nvp("pT2", pTB); Robert Ramey

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shared_ptr and signals
by James C. Sutherland 30 Dec '08

30 Dec '08

Is it possible to use a shared_ptr object in a signal? I want something like struct A{ ... void operator()(){ ... } ... }; typedef boost::signal<void()> Signal; Signal mySignal; boost::shared_ptr<A> a( new A() ); mySignal.connect(a); The trouble seems to be getting the signal to dereference the pointer when the callback is made... Any tips? James

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Upgrading from V1.31 to V1.33.1
by Dyuti Barma 30 Dec '08

30 Dec '08

Hi everyone, While upgrading from boost version 1.31 to version 1.33.1, I'm getting the following errors : error C3861: 'BOOST_DEFAULT_ALLOCATOR': identifier not found Has this macro been deprecated ? Any work arounds available for this ? Any information would be appreciated. Thanks Dyuti

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[lambda] Should the code compile?
by Max 30 Dec '08

30 Dec '08

Hello, For ease of reading, I've reformatted the previously posted message. I have the following simple code, but doesn't get compiled: #define DECLARE_PTR_AUTO_DELETOR_CONDITIONAL(CLASS, VAR_PTR, CONDITION)\ boost::scoped_ptr auto__deletor__for__ ## VAR_PTR (\ boost::lambda::ret(boost::lambda::if_then_else(_1,\ VAR_PTR, static_cast(0)))(static_cast(CONDITION))) struct B { B() { std::cout << _T("\nCalling B::B()"); } ~B() { std::cout << _T("\nCalling B::~B()"); } }; bool processB(B *pb, bool consume) { if(consume) if(pb) { std::cout << _T("\nDeleting B by processB()"); delete pb; } return consume; } void test_selector() { bool consumed; B *pb1 = new B(); consumed = processB(pb1, true); // delete by processB DECLARE_PTR_AUTO_DELETOR_CONDITIONAL(B, pb1, (! consumed)); B *pb2 = new B(); consumed = processB(pb2, false); // you do the job! DECLARE_PTR_AUTO_DELETOR_CONDITIONAL(B, pb2, (! consumed)); } int main() { test_selector(); return 0; } Thanks for any help. B/Rgds Max ------------------------------------------------------------------- 新浪空间——与朋友开心分享网络新生活！(http://space.sina.com.cn/ )

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newbie: asio ssl help
by Seiryuu Kami 30 Dec '08

30 Dec '08

Hello, I'm a 21 year old dutch student currently working with the ASIO library. I have a basic knowledge of C++ and I know not much of SSL. That is the part of the ASIO lib I'm having trouble with. I'm looking for anyone who can help me. I have pretty much copy-pasted the boost example on SSL clients. ( http://www.boost.org/doc/libs/1_37_0/doc/html/boost_asio/example/ssl/client… ) My intention is to open a connection to a website that uses HTTPS, login.deviantart.com to be exact. I need to obtain a cookie from there. I have no PEM file to use a certificate, and I doubt I need one. But the thing is, I keep receiving: "Handshake failed: asio:1". I've tried everything I could think of to make it work. But I'm just a student. So, can anyone help me? Kind regards, Ben

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[lambda] Should the code compile?
by Max 30 Dec '08

30 Dec '08

Hello I have the following simple code, but doesn't get compiled: #define DECLARE_PTR_AUTO_DELETOR_CONDITIONAL(CLASS, VAR_PTR, CONDITION)\ boost::scoped_ptr<CLASS> auto__deletor__for__ ## VAR_PTR (\ boost::lambda::ret<CLASS*>(boost::lambda::if_then_else(_1,\ VAR_PTR, static_cast<CLASS*>(0)))(static_cast<bool>(CONDITION))) struct B { B() { std::cout << _T("\nCalling B::B()"); } ~B() { std::cout << _T("\nCalling B::~B()"); } }; bool processB(B *pb, bool accept) { if(accept) if(pb) { std::cout << _T("\nDeleting B by processB()"); delete pb; } return accept; } void test_selector() { bool result; B *pb1 = new B(); result = processB(pb1, true); // delete by processB DECLARE_PTR_AUTO_DELETOR_CONDITIONAL(B, pb1, (result == false)); B *pb2 = new B(); result = processB(pb2, false); // you do the job! DECLARE_PTR_AUTO_DELETOR_CONDITIONAL(B, pb2, (result == false)); } int main() { test_selector(); } Thanks for any help. B/Rgds Max ------------------------------------------------------------------- 新浪空间——与朋友开心分享网络新生活！(http://space.sina.com.cn/ )

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