September 2004 - Boost-users

boost signals dll does not export all functions
by Gast 128 09 Sep '04

09 Sep '04

Dear all, Probably already a known problem, but if one uses the signals library as a dll, the dll does not contain all exports (e.g. signal_base_impl::~signal_base_impl()). Tracking this down it looks like that the file 'signal_base.cpp' does not see that it has to create exported functions. This is due to the fact that 'BOOST_HAS_DECLSPEC' is not defined, which is defined a compiler specific header file ('visualc.hpp'). However another cpp file from signals, 'connection.cpp', does create exported function. Thus as a work around I added '#include <boost/signals/detail/signals_common.hpp>' as first include in 'signal_base.cpp' (and also to the other cpp files of signals) and bjamed again. Will this issue resolved in the next release? Wkr, me

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Directory_Iterator -> hangs app
by RYAN ROSARIO 09 Sep '04

09 Sep '04

I am still stuck with this issue of a directory_iterator causing a hang when it is declared. This is one of the most bizarre things I have ever encountered. Some more clues have arisen since my last post: - Upon hanging, I now get a message box: Unhandled exception at 0x77e73887 in PICtool-w32.exe: Microsoft C++ exception: boost::filesystem::filesystem_error @ 0x0012f170. I seem to be getting *somewhere* although the message seems very vague. - Upon executing the app in the explorer (not MSVC), I get a Runtime Error: The app has requested runtime to terminate in an unusual way. - I ran Spy++ and see to get quite a few WM_GETDLGCODE messages. I have read that this can signify a problem. Has anybody else had a problem like this with the directory_iterator? Any help or suggestion is greatly appreciated as I have been stuck for quite a while. :-( FYI: MSVC .NET 2003, running as Multi-Threaded Debug DLL using the multi-threaded version of the Boost::Filesystem library. Thanks Again, Ryan --------------------------------- Do you Yahoo!? Win 1 of 4,000 free domain names from Yahoo! Enter now.

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Unit Test Framework for non-boost projects?
by Steven T. Hatton 08 Sep '04

08 Sep '04

I believe I figured out how the examples in the 'subproject libs/test/example ;' are being compiled. Basically it goes like this: bjam reads the Jamfile which contains this rule: rule boost-test-example ( example-name : lib-name ) { exe $(example-name) : $(example-name).cpp <lib>../build/$(lib-name) : <sysinclude>$(BOOST_ROOT) <stlport-iostream>on <borland><*><cxxflags>-w-8080 ; } followed by a series of invocation of that rule such as: boost-test-example unit_test_example1 : boost_unit_test_framework ; The rule is evaluated by putting the first argument 'unit_test_example1' in the slot for the target name, and for the sources required to build. In addition to unit_test_example1.cpp, the expression <lib>../build/$(lib-name) is evaluated to add the library resulting from compiling other source files. These are named by reading $(BOOST_ROOT)/libs/test/build/Jamfile and expanding the target: lib boost_unit_test_framework : <template>boost_test_lib ../src/$(UTF_SOURCES).cpp ; The <template> adds some boiler-plate information and the ../src/$(UTF_SOURCES).cpp expands the following list: UTF_SOURCES = execution_monitor test_tools unit_test_parameters unit_test_log unit_test_monitor unit_test_result unit_test_suite unit_test_main supplied_log_formatters ; to create a list of file names of the form: ../src/execution_monitor.cpp If the library does not already exists, these are compiled, and the results are placed in the location specified by this directive: install test lib : [ unless $(NT) : <dll>boost_prg_exec_monitor <dll>boost_test_exec_monitor <dll>boost_unit_test_framework ] <lib>boost_prg_exec_monitor <lib>boost_test_exec_monitor <lib>boost_unit_test_framework ; Since they have already been compiled, bjam tells the compiler to link against them. After rebuilding all of boost and installing the headers and libraries to the default location, I am now able to compile one of the examples as follows: g++ -o unit_test_example5 unit_test_example5.cpp\ -lboost_unit_test_framework-gcc I don't fully understand why I need the -l switch, but adding it enabled the linker to succeed. I assume I could find a way to modify the above mentioned Jamfiles to do basically the same thing in my project directory, but the step of specifying the sources with which to build the libraries seems inappropriate for using the Unit Test Framework in my own project. How do I tell bjam to link against the correct library file? -- Regards, Steven

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constant size arrays - why never a simulation of push pop?
by Frank Maddin 08 Sep '04

08 Sep '04

Maybe there is a good reason for this, but I've often wondered why there is no version of constant size arrays that support push_back() and pop_back(). In the past I've wanted to use a c_array in situations, but couldn't because at some point I wanted to use an algorithm or template function that used push/pop. So I end up using vector/reserve. I can't think of any problem off the top of my head. Seems like just some management of current size(), iterator manipulation etc. Maybe there is some reason I've never seen this or perhaps there is something I'd run into if I tried to roll my own based off of boost::array or c_array? Thanks Frank

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ublas identity_matrix problem
by Heiko Bauke 08 Sep '04

08 Sep '04

Dear all, I discovered a problem in ublas identity_matrix class. I am doing linear algebra in finite fields. So my matrices contain no floats nor doubles. Instead I use some class that behaves like a number but does arithmetic in a finite field. Class instances are contructable by int, but _not_ default constructable by int. I don't want to have this. In matrix.hpp one finds the lines template<class T> typename identity_matrix<T>::value_type identity_matrix<T>::zero_=0; template<class T> typename identity_matrix<T>::value_type identity_matrix<T>::one_=1; These lines are problematic and the reason why my number class works not with the identity_matrix class. I think these lines should by changed into template<class T> typename identity_matrix<T>::value_type identity_matrix<T>::zero_=T(0); template<class T> typename identity_matrix<T>::value_type identity_matrix<T>::one_=T(1); to make the ublas code more general. with regards Heiko -- -- Gute Sitten haben für die Gesellschaft mehr Wert als alle -- Berechnungen Newtons. (Friedrich II., der Große, 1712-1786) -- Supercomputing in Magdeburg @ http://tina.nat.uni-magdeburg.de -- Heiko Bauke @ http://www.uni-magdeburg.de/bauke

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How to remove custom property map from graph dynamically ?
by Raj 08 Sep '04

08 Sep '04

Hi, I have an adjacency list graph with three custom property maps attached. At some point during the run of the program, I would like to remove two of those maps from the graph. Is it possible ? How can I do it ? Thanks in advance Raja

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RE: [Boost-users] Re: statically linking to Boost.Threads with msvc7
by Simmons, Aaron 08 Sep '04

08 Sep '04

> In Boost release 1.31, the Boost.Threads library doesn't support static > linking. This limitation will be removed in the next release (coming > soon) for: > > a) anyone using the pthreads implementation of Boost.Threads > b) anyone using Visual C++ on Win32 > > Hopefully it will be removed for other Win32 compilers in the future. How was the TSS problem solved for win32-threads? What's the ETA for the next version? Thanks, aaron

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macro m4 for boost
by Thomas Lemaire 08 Sep '04

08 Sep '04

Hi boost-users, I am looking for a macro m4 (used by autoconf) that automatically detects boost installation directory. Has anybody got it ? thomas

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dynamically created program options
by Rodolfo Schulz de Lima 08 Sep '04

08 Sep '04

Hi, I wonder if it's possible to handle dynamically created program options with boost::program_options. For instance: I have a config file that specifies configure options for dynamic loaded modules in my project. So the cfg file would be: [module.foo1] module_file = foo.so listen_port = 564 enabled = true [module.foo2] module_file = foo.so listen_port = 565 enabled = false [module.bar1] module_file = bar.so listen_port = 145 enabled = true As can be seen, foo1, foo2 and bar1 names are defined by the user in the configure file, and the program doesn't know about them before parsing the configuration. But if we parse that (somehow), an exception saying that the option "module.foo1.module_file" is invalid will be thrown. Can I manage the options_description "on the fly"? Another less complicated situation would be something like this: modules = foo1 foo2 bar1 [module.foo1] . . . [module.foo2] . . . [module.bar1] . . . So when parsing the "modules" option, we would know the new options name and it would be a matter of appending more option descriptions to the object. Regards, rod

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Min-Cut o Max-Flow in a graph?
by Daniele Carlucci 08 Sep '04

08 Sep '04

Hi, How can I find the min-cut, or the max-flow in a graph with all the costs of edges equal one? Thanks Daniele

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