August 2012 - Boost-users - lists.preview.boost.org

Is unit test framework still not thread-safe?
by Chris Cleeland 15 Aug '12

15 Aug '12

I just want to verify...is Boost's unit test framework still not thread-safe? FWIW, I'm using 1.47.0. -- Chris Cleeland

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Move semantics for sparse matrix classes ?
by Rishi Amrit 15 Aug '12

15 Aug '12

Hi, I wanted to check if move constructors have been added to the sparse matrix classes yet ? Thanks, Kind regards, R.

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[Building Boost] Is there a way to customize dll names?
by Rob Conde 14 Aug '12

14 Aug '12

I would like to change the default dll names generated by bjam. For example: something_boost_date_time-vc90-mt-1_44.dll rather than: boost_date_time-vc90-mt-1_44.dll Is there a straightforward way of accomplishing this? Thanks in Advance, Rob Conde

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How to connect to any boost::signal with a void returning function?
by Sak 14 Aug '12

14 Aug '12

Hi All, I'm trying to connect a simple void returning function to multiple signals of varying signature, I can see some references mentioning that it's possible using boost::lambda::bind and boost::spirit::bind, But I keep getting compilation errors, Is there something wrong with the following code? Or is there a better way to do it? or is it not possible to do? Boost version: Release 1.46.1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 #include <boost/signals2.hpp>#include <boost/lambda/bind.hpp>#include <boost/lambda/lambda.hpp> #include <boost/spirit/include/phoenix.hpp> using namespace boost::signals2; void func() { printf("Func called!"); } main() { signal<int(int)> sig; sig.connect( (boost::lambda::bind(func), 1) ); // Compilation error // sig.connect( (boost::phoenix::bind(func), 1) ); // Compilation error } I'm getting the following compilation errors when using boost::lambda::bind: 1 2 3 4 5 /opt/include/boost/signals2/detail/slot_template.hpp: In member function ‘void boost::signals2::slot1<R, T1, SlotFunction>::init_slot_function(const F&) [with F = int, R = int, T1 = int, SlotFunction = boost::function<int(int)>]’: /opt/include/boost/signals2/detail/slot_template.hpp:81:9: instantiated from ‘boost::signals2::slot1<R, T1, SlotFunction>::slot1(const F&) [with F = int, R = int, T1 = int, SlotFunction = boost::function<int(int)>]’ hello-world-example.cpp:15:51: instantiated from here /opt/include/boost/signals2/detail/slot_template.hpp:156:9: error: invalid conversion from ‘int’ to ‘boost::function<int(int)>::clear_type*’ [-fpermissive] /opt/include/boost/function/function_template.hpp:1110:14: error: initializing argument 1 of ‘boost::function<R(T0)>::self_type& boost::function<R(T0)>::operator=(boost::function<R(T0)>::clear_type*) [with R = int, T0 = int, boost::function<R(T0)>::self_type = boost::function<int(int)>]’ [-fpermissive] I'm getting the following compilation errors when using boost::phoenix::bind: 1 2 3 4 5 /opt/include/boost/function/function_template.hpp: In static member function ‘static R boost::detail::function::function_obj_invoker1<FunctionObj, R, T0>::invoke(boost::detail::function::function_buffer&, T0) [with FunctionObj = boost::phoenix::actor<boost::phoenix::composite<boost::phoenix::detail::function_eval<0>, boost::fusion::vector<boost::phoenix::value<boost::phoenix::detail::function_ptr<0, void, void (*)()> >, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_> > >, R = int, T0 = int]’: /opt/include/boost/function/function_template.hpp:913:60: instantiated from ‘void boost::function1<R, T1>::assign_to(Functor) [with Functor = boost::phoenix::actor<boost::phoenix::composite<boost::phoenix::detail::function_eval<0>, boost::fusion::vector<boost::phoenix::value<boost::phoenix::detail::function_ptr<0, void, void (*)()> >, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_> > >, R = int, T0 = int]’ /opt/include/boost/function/function_template.hpp:722:7: instantiated from ‘boost::function1<R, T1>::function1(Functor, typename boost::enable_if_c<boost::type_traits::ice_not<boost::is_integral<Functor>::value>::value, int>::type) [with Functor = boost::phoenix::actor<boost::phoenix::composite<boost::phoenix::detail::function_eval<0>, boost::fusion::vector<boost::phoenix::value<boost::phoenix::detail::function_ptr<0, void, void (*)()> >, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_> > >, R = int, T0 = int, typename boost::enable_if_c<boost::type_traits::ice_not<boost::is_integral<Functor>::value>::value, int>::type = int]’ /opt/include/boost/function/function_template.hpp:1064:16: instantiated from ‘boost::function<R(T0)>::function(Functor, typename boost::enable_if_c<boost::type_traits::ice_not<boost::is_integral<Functor>::value>::value, int>::type) [with Functor = boost::phoenix::actor<boost::phoenix::composite<boost::phoenix::detail::function_eval<0>, boost::fusion::vector<boost::phoenix::value<boost::phoenix::detail::function_ptr<0, void, void (*)()> >, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_> > >, R = int, T0 = int, typename boost::enable_if_c<boost::type_traits::ice_not<boost::is_integral<Functor>::value>::value, int>::type = int]’ /opt/include/boost/function/function_template.hpp:1105:5: instantiated from ‘typename boost::enable_if_c<boost::type_traits::ice_not<boost::is_integral<Functor>::value>::value, boost::function<R(T0)>&>::type boost::function<R(T0)>::operator=(Functor) [with Functor = boost::phoenix::actor<boost::phoenix::composite<boost::phoenix::detail::function_eval<0>, boost::fusion::vector<boost::phoenix::value<boost::phoenix::detail::function_ptr<0, void, void (*)()> >, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_> > >, R = int, T0 = int, typename boost::enable_if_c<boost::type_traits::ice_not<boost::is_integral<Functor>::value>::value, boost::function<R(T0)>&>::type = boost::function<int(int)>&]’ /opt/include/boost/signals2/detail/slot_template.hpp:156:9: instantiated from ‘void boost::signals2::slot1<R, T1, SlotFunction>::init_slot_function(const F&) [with F = boost::phoenix::actor<boost::phoenix::composite<boost::phoenix::detail::function_eval<0>, boost::fusion::vector<boost::phoenix::value<boost::phoenix::detail::function_ptr<0, void, void (*)()> >, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_> > >, R = int, T1 = int, SlotFunction = boost::function<int(int)>]’ /opt/include/boost/signals2/detail/slot_template.hpp:81:9: instantiated from ‘boost::signals2::slot1<R, T1, SlotFunction>::slot1(const F&) [with F = boost::phoenix::actor<boost::phoenix::composite<boost::phoenix::detail::function_eval<0>, boost::fusion::vector<boost::phoenix::value<boost::phoenix::detail::function_ptr<0, void, void (*)()> >, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_> > >, R = int, T1 = int, SlotFunction = boost::function<int(int)>]’ ../../../examples/hello-world/hello-world-example.cpp:16:51: instantiated from here /opt/include/boost/function/function_template.hpp:132:42: error: void value not ignored as it ought to be /opt/include/boost/function/function_template.hpp:133:9: error: control reaches end of non-void function [-Werror=return-type] Many thanks, Sak

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[bind, function] pointer to member function under Xcode 4.1.1
by Stuart Malone 13 Aug '12

13 Aug '12

I'm having trouble compiling some very simple boost::function and boost::bind code under Xcode 4.4.1 using the default Apple LLVM compiler 4.0. I've simplified the code down to: #include <boost/bind.hpp> #include <boost/function.hpp> struct Monitor { void Change(int a, int b); void Lose() { auto b = boost::bind(&Monitor::Change, this); boost::function<void (int, int)> f(b); } }; On the second line of the Lose() function I get the error "reference to non-static member function must be called". The full error message is below. I haven't been able to figure out just where the problem is. Is this an incompatibility between Boost 1.50 and Xcode 4.4.1, or am I making some other mistake? Is there a straightforward workaround? Thanks, —Stuart In file included from /Users/samalone/Projects/functionbind/functionbind/main.cpp:1: In file included from /Users/samalone/Boost/boost/bind.hpp:22: In file included from /Users/samalone/Boost/boost/bind/bind.hpp:26: In file included from /Users/samalone/Boost/boost/mem_fn.hpp:22: /Users/samalone/Boost/boost/bind/mem_fn.hpp:342:16: error: reference to non-static member function must be called return (p->*f_); ^~~~~~~~ /Users/samalone/Boost/boost/bind/bind.hpp:243:16: note: in instantiation of member function 'boost::_mfi::dm<void (int, int), Monitor>::operator()' requested here return unwrapper<F>::unwrap(f, 0)(a[base_type::a1_]); ^ /Users/samalone/Boost/boost/bind/bind_template.hpp:61:27: note: in instantiation of function template specialization 'boost::_bi::list1<boost::_bi::value<Monitor *> >::operator()<void (&)(int, int), boost::_mfi::dm<void (int, int), Monitor>, boost::_bi::list2<int &, int &> >' requested here BOOST_BIND_RETURN l_(type<result_type>(), f_, a, 0); ^ /Users/samalone/Boost/boost/function/function_template.hpp:153:33: note: in instantiation of function template specialization 'boost::_bi::bind_t<void (&)(int, int), boost::_mfi::dm<void (int, int), Monitor>, boost::_bi::list1<boost::_bi::value<Monitor *>> >::operator()<int, int>' requested here BOOST_FUNCTION_RETURN((*f)(BOOST_FUNCTION_ARGS)); ^ /Users/samalone/Boost/boost/function/function_template.hpp:75:36: note: expanded from macro 'BOOST_FUNCTION_RETURN' # define BOOST_FUNCTION_RETURN(X) X ^ /Users/samalone/Boost/boost/function/function_template.hpp:907:53: note: in instantiation of member function 'boost::detail::function::void_function_obj_invoker2<boost::_bi::bind_t<void (&)(int, int), boost::_mfi::dm<void (int, int), Monitor>, boost::_bi::list1<boost::_bi::value<Monitor *>>>, void, int, int>::invoke' requested here { { &manager_type::manage }, &invoker_type::invoke }; ^ /Users/samalone/Boost/boost/function/function_template.hpp:722:13: note: in instantiation of function template specialization 'boost::function2<void, int, int>::assign_to<boost::_bi::bind_t<void (&)(int, int), boost::_mfi::dm<void (int, int), Monitor>, boost::_bi::list1<boost::_bi::value<Monitor *>>> >' requested here this->assign_to(f); ^ /Users/samalone/Boost/boost/function/function_template.hpp:1042:5: note: in instantiation of function template specialization 'boost::function2<void, int, int>::function2<boost::_bi::bind_t<void (&)(int, int), boost::_mfi::dm<void (int, int), Monitor>, boost::_bi::list1<boost::_bi::value<Monitor *>>> >' requested here base_type(f) ^ /Users/samalone/Projects/functionbind/functionbind/main.cpp:9:42: note: in instantiation of function template specialization 'boost::function<void (int, int)>::function<boost::_bi::bind_t<void (&)(int, int), boost::_mfi::dm<void (int, int), Monitor>, boost::_bi::list1<boost::_bi::value<Monitor *>>> >' requested here boost::function<void (int, int)> f(b); ^ 1 error generated.

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Compilation Problem Boost 1.50
by saugat mitra 13 Aug '12

13 Aug '12

Hi I am trying yo compile Secret Maryo Chronicles SMC 1,9 on my Ubuntu machine 11.10 . I have installed Boost 1.50.0. But when I run make I get the following error - [code] core/filesystem/filesystem.cpp: In function ‘bool SMC::Dir_Exists(const string&)’: core/filesystem/filesystem.cpp:67:47: error: invalid conversion from ‘bool (*)(const string&) {aka bool (*)(const std::basic_string<char>&)}’ to ‘boost::enable_if_c<true, void>::type* {aka void*}’ [-fpermissive] /usr/include/boost/filesystem/v3/path.hpp:130:5: error: initializing argument 2 of ‘boost::filesystem3::path::path(const Source&, typename boost::enable_if<boost::filesystem3::path_traits::is_pathable<typename boost::decay<Source>::type> >::type*) [with Source = std::basic_string<char>, typename boost::enable_if<boost::filesystem3::path_traits::is_pathable<typename boost::decay<Source>::type> >::type = void]’ [-fpermissive] core/filesystem/filesystem.cpp: In function ‘bool SMC::Create_Directory(const string&)’: core/filesystem/filesystem.cpp:92:57: error: invalid conversion from ‘bool (*)(const string&) {aka bool (*)(const std::basic_string<char>&)}’ to ‘boost::enable_if_c<true, void>::type* {aka void*}’ [-fpermissive] /usr/include/boost/filesystem/v3/path.hpp:130:5: error: initializing argument 2 of ‘boost::filesystem3::path::path(const Source&, typename boost::enable_if<boost::filesystem3::path_traits::is_pathable<typename boost::decay<Source>::type> >::type*) [with Source = std::basic_string<char>, typename boost::enable_if<boost::filesystem3::path_traits::is_pathable<typename boost::decay<Source>::type> >::type = void]’ [-fpermissive] core/filesystem/filesystem.cpp: In function ‘std::vector<std::basic_string<char> > SMC::Get_Directory_Files(const string&, const string&, bool, bool)’: [/code] Any help would be much appreciated. Thanks.

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[lexical_cast] is it possible to customize the conversion from double to string?
by Wu Degang 13 Aug '12

13 Aug '12

Hi, The default behavior of lexical_cast<string>(a_double_variable) will result in a number string that is very long and barely readable. Is it possible to customize the way lexical_cast<string>(a_double_variable) can have a similar result as '%.2f' or '%.3e'? Thank you! wdg

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request: plz add operator() to mpl::true_ and mpl::false_
by Niitsuma Hirotaka 12 Aug '12

12 Aug '12

plz add operator() to mpl::true_ and mpl_::false let us consider the following case. struct foo{}; template<typename T> struct is_foo_traits : boost::mpl::false_ {}; template<> struct is_foo_traits<foo> : boost::mpl::true_ {}; template<typename T> bool is_foo(const T& dummy){return false;} template<> bool is_foo<foo>(const foo& dummy){return true;} void main() { using namespace boost; using namespace std; foo myfoo; cout << is_foo(myfoo) << endl;//true cout << is_foo(12) << endl;//false cout << is_foo_traits<foo>::value << endl;//true cout << is_foo_traits<int>::value << endl;//false } In this case, we need to define same thing two times. However if mpl::true_ have operator() as like mpl::true_ { template<typename T> bool operator()(const T & dummy){return true;} }; We can remove one line using: template<typename T> bool is_foo(const T& dummy){return is_foo_traits<T>::value;}

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Boost, Andoird and iOS
by Mohsen Pahlevanzadeh 12 Aug '12

12 Aug '12

Dear all, We are developing an application under GNU/Linux, But we `must` code it multiplatform, So, i don't know when i use boost can i use it under Android and iOS or not? --Mohsen

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Semaphores vs. condition_variable with valgrind/helgrind
by Chris Stankevitz 12 Aug '12

12 Aug '12

Hello, Does boost provide a semaphore (aka an implementation of pthreads's sem_post and sem_wait)? I know boost provides a condition_variable. However, I would prefer a true POSIX semaphore. I created a "semaphore" using internally boost condition variables. Valgrind's tool "helgrind" is reporting false positives on my implentation of a semaphore due to my use of condition_variables. According to http://www.valgrind.org/docs/manual/hg-manual.htm Avoid POSIX condition variables. If you can, use POSIX semaphores (sem_t, sem_post, sem_wait) to do inter-thread event signalling. Thank you, Chris

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