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Proposed interface change to boost::algorithm::copy_while
by Marshall Clow 26 Feb '13

26 Feb '13

In 1.50, I introduced: template<typename InputIterator, typename OutputIterator, typename Predicate> OutputIterator copy_while ( InputIterator first, InputIterator last, OutputIterator result, Predicate p ); (and copy_until), which do pretty much what you would expect: copy items from the input to the output as long as the predicate holds. Sean Parent has convinced me that this is wrong; that I have to return the modified input iterator as well. When I wrote these, I was thinking (if I actually was thinking) of actual input iterators, and since they're all the same, so the caller can pick up on the input sequence after the call returns. However, if you're processing (say) a list, it would be kind of useful to know how far in the list the call advanced. I'm proposing to change the interface to: template<typename InputIterator, typename OutputIterator, typename Predicate> std::pair<InputIterator, OutputIterator> copy_while ( InputIterator first, InputIterator last, OutputIterator result, Predicate p ); i.e, changing the return type to return both iterators. What this means: * If you're not calling copy_while (or copy_until), then this change won't affect you. * If you're not using the return value, then this change won't affect you. * If you are using the return value, then you will have to change your code thus: Old foo = copy_while ( first, last, out, p ); New: foo = copy_while ( first, last, out, p ).second; * if you were not using these calls because they didn't return the input iterator, now you can. Questions? Comments? (Except for the "How could you miss that when you wrote those routines?" - I've already asked myself that) Improvements? -- Marshall Marshall Clow Idio Software <mailto:mclow.lists@gmail.com> A.D. 1517: Martin Luther nails his 95 Theses to the church door and is promptly moderated down to (-1, Flamebait). -- Yu Suzuki

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[context][iostreams] Cygwin Boost 1.53 error building some libraries.
by Mostafa 26 Feb '13

26 Feb '13

On Windows 7, cygwin 2.7, trying to build Boost 1.53 with the following options fails: ./b2.exe --layout=system --variant=release --link=static,shared --threading=single,multi install -j4 with the following errors: gcc.compile.asm bin.v2/libs/context/build/gcc-4.5.3/release/link-static/threading-multi/asm/make_i386_sysv_elf_gas.o libs/context/src/asm/make_i386_sysv_elf_gas.S: Assembler messages: libs/context/src/asm/make_i386_sysv_elf_gas.S:37: Warning: .type pseudo-op used outside of .def/.endef ignored. libs/context/src/asm/make_i386_sysv_elf_gas.S:37: Error: junk at end of line, first unrecognized character is `m' libs/context/src/asm/make_i386_sysv_elf_gas.S:77: Warning: .size pseudo-op used outside of .def/.endef ignored. libs/context/src/asm/make_i386_sysv_elf_gas.S:77: Error: junk at end of line, first unrecognized character is `m' gcc.archive bin.v2/libs/atomic/build/gcc-4.5.3/release/link-static/threading-multi/libboost_atomic.a "g++" -x assembler-with-cpp -O3 -finline-functions -Wno-inline -Wall -DBOOST_ALL_NO_LIB=1 -DNDEBUG -I"." -c -o "bin.v2/libs/context/build/gcc-4.5.3/release/link-static/threading-multi/asm/make_i386_sysv_elf_gas.o" "libs/context/src/asm/make_i386_sysv_elf_gas.S" ...failed gcc.compile.asm bin.v2/libs/context/build/gcc-4.5.3/release/link-static/threading-multi/asm/make_i386_sysv_elf_gas.o... common.copy /home/HPC/boost/v1_53_0/lib/libboost_atomic.a gcc.archive bin.v2/libs/system/build/gcc-4.5.3/release/link-static/threading-multi/libboost_system.a ... common.mkdir bin.v2/libs/date_time/build/gcc-4.5.3/release/link-static gcc.compile.asm bin.v2/libs/context/build/gcc-4.5.3/release/link-static/threading-multi/asm/jump_i386_sysv_elf_gas.o libs/context/src/asm/jump_i386_sysv_elf_gas.S: Assembler messages: libs/context/src/asm/jump_i386_sysv_elf_gas.S:37: Warning: .type pseudo-op used outside of .def/.endef ignored. libs/context/src/asm/jump_i386_sysv_elf_gas.S:37: Error: junk at end of line, first unrecognized character is `j' libs/context/src/asm/jump_i386_sysv_elf_gas.S:72: Warning: .size pseudo-op used outside of .def/.endef ignored. libs/context/src/asm/jump_i386_sysv_elf_gas.S:72: Error: junk at end of line, first unrecognized character is `j' "g++" -x assembler-with-cpp -O3 -finline-functions -Wno-inline -Wall -DBOOST_ALL_NO_LIB=1 -DNDEBUG -I"." -c -o "bin.v2/libs/context/build/gcc-4.5.3/release/link-static/threading-multi/asm/jump_i386_sysv_elf_gas.o" "libs/context/src/asm/jump_i386_sysv_elf_gas.S" ...failed gcc.compile.asm bin.v2/libs/context/build/gcc-4.5.3/release/link-static/threading-multi/asm/jump_i386_sysv_elf_gas.o... ...skipped <pbin.v2/libs/context/build/gcc-4.5.3/release/link-static/threading-multi>libboost_context.a(clean) for lack of <pbin.v2/libs/context/build/gcc-4.5.3/release/link-static/threading-multi>asm/make_i386_sysv_elf_gas.o... ...skipped <pbin.v2/libs/context/build/gcc-4.5.3/release/link-static/threading-multi>libboost_context.a for lack of <pbin.v2/libs/context/build/gcc-4.5.3/release/link-static/threading-multi>asm/make_i386_sysv_elf_gas.o... ... common.mkdir bin.v2/libs/locale/build/gcc-4.5.3/release/link-static common.mkdir bin.v2/libs/locale/build/gcc-4.5.3/release/link-static/threading-multi gcc.compile.c++ bin.v2/libs/iostreams/build/gcc-4.5.3/release/link-static/threading-multi/bzip2.o libs\iostreams\src\bzip2.cpp:20:56: fatal error: bzlib.h: No such file or directory compilation terminated. "g++" -ftemplate-depth-128 -O3 -finline-functions -Wno-inline -Wall -mthreads -DBOOST_ALL_NO_LIB=1 -DBOOST_IOSTREAMS_USE_DEPRECATED -DNDEBUG -I"." -c -o "bin.v2\libs\iostreams\build\gcc-4.5.3\release\link-static\threading-multi\bzip2.o" "libs\iostreams\src\bzip2.cpp" ...failed gcc.compile.c++ bin.v2/libs/iostreams/build/gcc-4.5.3/release/link-static/threading-multi/bzip2.o... ...skipped <pbin.v2/libs/iostreams/build/gcc-4.5.3/release/link-static/threading-multi>libboost_iostreams.a(clean) for lack of <pbin.v2/libs/iostreams/build/gcc-4.5.3/release/link-static/threading-multi>bzip2.o... ...skipped <pbin.v2/libs/iostreams/build/gcc-4.5.3/release/link-static/threading-multi>libboost_iostreams.a for lack of <pbin.v2/libs/iostreams/build/gcc-4.5.3/release/link-static/threading-multi>bzip2.o... ... ...failed updating 6 targets... ...skipped 14 targets... ...updated 3818 targets...

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bjam compiler error
by Christian Henning 26 Feb '13

26 Feb '13

Hi, I'm getting an compiler error when I try to build gil::io documentation. ...patience... ...patience... ...found 1737 targets... ...updating 5 targets... compile-c-c++ ..\..\..\..\bin.v2\tools\quickbook\src\msvc-10.0\release\link-static\threading-multi\values.obj values.cpp C:\boost\tools\quickbook\src\values.cpp(444) : error C2593: 'operator ==' is ambiguous ..\..\..\..\boost/utility/string_ref.hpp(275): could be 'bool boost::operator ==<char,std::char_traits<char>>(boost::basic_string_ref<charT,traits>,boost::basic_string_ref<charT,traits>)' [found using argument-dependent lookup] with [ charT=char, traits=std::char_traits<char> ] ..\..\..\..\boost/utility/string_ref.hpp(270): or 'bool boost::operator ==<char,std::char_traits<char>>(boost::basic_string_ref<charT,traits>,boost::basic_string_ref<charT,traits>)' [found using argument-dependent lookup] with [ charT=char, traits=std::char_traits<char> ] ..\..\..\..\boost/utility/string_ref.hpp(265): or 'bool boost::operator ==<char,std::char_traits<char>>(boost::basic_string_ref<charT,traits>,boost::basic_string_ref<charT,traits>)' [found using argument-dependent lookup] with [ charT=char, traits=std::char_traits<char> ] while trying to match the argument list '(boost::string_ref, boost::string_ref)' C:\boost\tools\quickbook\src\values.cpp(499) : error C2593: 'operator ==' is ambiguous ..\..\..\..\boost/utility/string_ref.hpp(275): could be 'bool boost::operator ==<char,std::char_traits<char>>(boost::basic_string_ref<charT,traits>,boost::basic_string_ref<charT,traits>)' [found using argument-dependent lookup] with [ charT=char, traits=std::char_traits<char> ] ..\..\..\..\boost/utility/string_ref.hpp(270): or 'bool boost::operator ==<char,std::char_traits<char>>(boost::basic_string_ref<charT,traits>,boost::basic_string_ref<charT,traits>)' [found using argument-dependent lookup] with [ charT=char, traits=std::char_traits<char> ] ..\..\..\..\boost/utility/string_ref.hpp(265): or 'bool boost::operator ==<char,std::char_traits<char>>(boost::basic_string_ref<charT,traits>,boost::basic_string_ref<charT,traits>)' [found using argument-dependent lookup] with [ charT=char, traits=std::char_traits<char> ] while trying to match the argument list '(boost::string_ref, boost::string_ref)' call "C:\program files (x86)\microsoft visual studio 10.0\VC\vcvarsall.bat" x86 >nul cl /Zm800 -nologo @"..\..\..\..\bin.v2\tools\quickbook\src\msvc-10.0\release\link-static\threading-multi\values.obj.rsp" ...failed compile-c-c++ ..\..\..\..\bin.v2\tools\quickbook\src\msvc-10.0\release\link-static\threading-multi\values.obj... ...skipped <p..\..\..\..\bin.v2\tools\quickbook\src\msvc-10.0\release\link-static\threading-multi>quickbook.exe for lack of <p..\..\..\..\bin.v2\tools\quickbook\src\msvc-10.0\release\link-static\threading-multi>values.obj... ...skipped <p..\..\..\..\bin.v2\libs\gil\io\doc\msvc-10.0\debug\threading-multi>io.xml for lack of <p..\..\..\..\bin.v2\tools\quickbook\src\msvc-10.0\release\link-static\threading-multi>quickbook.exe... ...skipped <p..\..\..\..\bin.v2\libs\gil\io\doc\msvc-10.0\debug\threading-multi>io.docbook for lack of <p..\..\..\..\bin.v2\libs\gil\io\doc\msvc-10.0\debug\threading-multi-object(xinclude-scanner)@1505>io.xml... ...skipped <phtml>standalone_HTML.manifest for lack of <p..\..\..\..\bin.v2\libs\gil\io\doc\msvc-10.0\debug\threading-multi>io.docbook... ...failed updating 1 target... ...skipped 4 targets... Regards, Christian

5 5

[type_erasure] Some issues
by Fabio Fracassi 25 Feb '13

25 Feb '13

Hi Steven, I recently gave a presentation about type erasure in general, and your library in particular, at our local C++ UG (see here http://prezi.com/kg6d82f-_yky/type-erasure/ or the examples at https://github.com/CppUGBerlin/Talks/tree/master/2013_02_19_TypeErasure if you are interested). During the preparation I discovered some issues I'd like to ask you about. First I think I discovered a bug either in your lib or in clang(with libc++) when compiling one of the documentation examples in C++11 mode. #include <boost/type_erasure/any.hpp> #include <boost/type_erasure/any_cast.hpp> #include <boost/type_erasure/builtin.hpp> #include <boost/type_erasure/operators.hpp> #include <boost/type_erasure/tuple.hpp> #include <iostream> namespace bte = boost::type_erasure; namespace mpl = boost::mpl; int main() { typedef bte::any< mpl::vector< bte::copy_constructible<>, bte::typeid_<>, bte::addable<>, bte::ostreamable<> > > any_type; any_type x(10); any_type y(7); any_type z(x + y); std::cout << z << std::endl; } Compiling this in C++03 mode is fine, in C++11 mode it fails with this error: In file included from te_multi03.cpp:5: ../../Staging/type_erasure/boost/type_erasure/operators.hpp:187:1: error: no matching function for call to 'call' BOOST_TYPE_ERASURE_BINARY_OPERATOR(addable, +) see [1] below for full error. The next are some things which I didn't get to work, and the documentation is silent on any pitfalls. I tried to implement Sean Parent's example from his Value Semantics talk and failed to write a concept that calls free functions instead of members. Here is what I tried (full code and error at [2] below): template<class OBJ, class T> struct drawable { static void apply(const OBJ& obj, T& os, size_t pos) { draw(obj, os, pos); } }; I get an error like: error call to function 'draw' that is neither visible in the template definition nor found by argument-dependent lookup I worked around this problem by defining a concept map, but that is not realy a good solution. On researching a better solution I saw that you already added the convenience macros BOOST_TYPE_ERASURE_MEMBER and BOOST_TYPE_ERASURE_FREE, but didn't have much luck with them. Is there a compileable example where they are used somewhere? Best regards Fabio **** [1] *************************************************************** [1] full error docu example: In file included from te_multi03.cpp:5: ../../Staging/type_erasure/boost/type_erasure/operators.hpp:187:1: error: no matching function for call to 'call' BOOST_TYPE_ERASURE_BINARY_OPERATOR(addable, +) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ../../Staging/type_erasure/boost/type_erasure/operators.hpp:166:20: note: expanded from macro 'BOOST_TYPE_ERASURE_BINARY_OPERATOR' return ::boost::type_erasure::call(name<T, U, R>(), lhs, rhs); \ ^~~~~~~~~~~~~~~~~~~~~~~~~~~ te_multi03.cpp:25:17: note: in instantiation of member function 'boost::type_erasure::operator+' requested here any_type z(x + y); ^ ../../Staging/type_erasure/boost/type_erasure/call.hpp:323:1: note: candidate template ignored: failed template argument deduction call( ^ ../../Staging/type_erasure/boost/type_erasure/call.hpp:356:1: note: candidate template ignored: substitution failure [with Op = boost::type_erasure::addable<boost::type_erasure::_self, boost::type_erasure::_self, boost::type_erasure::_self>, U = <const boost::type_erasure::any<boost::mpl::vector<boost::type_erasure::copy_constructible<boost::type_erasure::_self>, boost::type_erasure::typeid_<boost::type_erasure::_self>, boost::type_erasure::addable<boost::type_erasure::_self, boost::type_erasure::_self, boost::type_erasure::_self>, boost::type_erasure::ostreamable<std::__1::basic_ostream<char>, boost::type_erasure::_self>, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na>, boost::type_erasure::_self>, boost::type_erasure::param<boost::mpl::vector<boost::type_erasure::copy_constructible<boost::type_erasure::_self>, boost::type_erasure::typeid_<boost::type_erasure::_self>, boost::type_erasure::addable<boost::type_erasure::_self, boost::type_erasure::_self, boost::type_erasure::_self>, boost::type_erasure::ostreamable<std::__1::basic_ostream<char>, boost::type_erasure::_self>, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na>, const boost::type_erasure::_self &>>]: no type named 'type' in 'boost::type_erasure::detail::call_result<boost::type_erasure::addable<boost::type_erasure::_self, boost::type_erasure::_self, boost::type_erasure::_self>, void (const boost::type_erasure::any<boost::mpl::vector<boost::type_erasure::copy_constructible<boost::type_erasure::_self>, boost::type_erasure::typeid_<boost::type_erasure::_self>, boost::type_erasure::addable<boost::type_erasure::_self, boost::type_erasure::_self, boost::type_erasure::_self>, boost::type_erasure::ostreamable<std::__1::basic_ostream<char>, boost::type_erasure::_self>, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na>, boost::type_erasure::_self> &, boost::type_erasure::param<boost::mpl::vector<boost::type_erasure::copy_constructible<boost::type_erasure::_self>, boost::type_erasure::typeid_<boost::type_erasure::_self>, boost::type_erasure::addable<boost::type_erasure::_self, boost::type_erasure::_self, boost::type_erasure::_self>, boost::type_erasure::ostreamable<std::__1::basic_ostream<char>, boost::type_erasure::_self>, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na>, const boost::type_erasure::_self &> &), void>' call( ^ 1 error generated. **** [2] *************************************************************** [2] Code and error for Value semantic example: #include <boost/type_erasure/any.hpp> #include <boost/type_erasure/concept_interface.hpp> #include <boost/type_erasure/rebind_any.hpp> #include <boost/type_erasure/free.hpp> #include <vector> namespace bte = boost::type_erasure; namespace mpl = boost::mpl; //-------------------------------------------------------------------------------------------------- template<class OBJ, class T> struct drawable { static void apply(const OBJ& obj, T& os, size_t pos) { draw(obj, os, pos); } }; namespace boost { namespace type_erasure { template<class OBJ, class T, class Base> struct concept_interface< ::drawable<OBJ, T>, Base, OBJ> : Base { void draw(typename rebind_any<Base, T&>::type os, size_t pos) const { call(::drawable<OBJ, T>(), *this, os, pos); } }; } } using object_t = bte::any< mpl::vector< bte::copy_constructible<>, drawable<bte::_self, std::ostream> >>; //-------------------------------------------------------------------------------------------------- void draw(const int& value, std::ostream& out, size_t position) { out << std::string(position, ' ') << "int = " << value << std::endl; } void draw(const std::string& value, std::ostream& out, size_t position) { out << std::string(position, ' ') << "string = " << value << std::endl; } struct my_class_t {}; void draw(const my_class_t&, std::ostream& out, size_t position) { out << std::string(position, ' ') << "my_class_t" << std::endl; } //-------------------------------------------------------------------------------------------------- using document_t = std::vector<object_t>; // or std::vector<copy_on_write<object_t>>; void draw(const document_t& x, std::ostream& out, size_t position) { out << std::string(position, ' ') << "<document>" << std::endl; for (auto& e : x) { e.draw(out, position + 2); } out << std::string(position, ' ') << "</document>" << std::endl; } //-------------------------------------------------------------------------------------------------- using history_t = std::vector<document_t>; void commit(history_t& x) { assert(x.size()); x.push_back(x.back()); } void undo(history_t& x) { assert(x.size()); x.pop_back(); } document_t& current(history_t& x) { assert(x.size()); return x.back(); } //-------------------------------------------------------------------------------------------------- int main () { history_t h(1); current(h).emplace_back(0); current(h).emplace_back(std::string("Hello!")); draw(current(h), std::cout, 0); std::cout << "--------------------------" << std::endl; commit(h); current(h).emplace_back(current(h)); current(h).emplace_back(my_class_t()); draw(current(h), std::cout, 0); std::cout << "--------------------------" << std::endl; undo(h); draw(current(h), std::cout, 0); } **** Error: ************************************************************ te_sp_copy.cpp:14:59: error: call to function 'draw' that is neither visible in the template definition nor found by argument-dependent lookup static void apply(const OBJ& obj, T& os, size_t pos) { draw(obj, os, pos); } ^ ../../Staging/type_erasure/boost/type_erasure/detail/instantiate.hpp:91:28: note: in instantiation of member function 'drawable<int, std::__1::basic_ostream<char> >::apply' requested here BOOST_PP_REPEAT(N, BOOST_TYPE_ERASURE_INSTANTIATE_IMPL, concept_sequence) ^ /usr/local/include/boost/preprocessor/repetition/repeat.hpp:38:60: note: expanded from macro 'BOOST_PP_REPEAT_1' # define BOOST_PP_REPEAT_1(c, m, d) BOOST_PP_REPEAT_1_I(c, m, d) ^ /usr/local/include/boost/preprocessor/repetition/repeat.hpp:43:63: note: expanded from macro 'BOOST_PP_REPEAT_1_I' # define BOOST_PP_REPEAT_1_I(c, m, d) BOOST_PP_REPEAT_1_ ## c(m, d) ^ /usr/local/include/boost/preprocessor/repetition/repeat.hpp:54:62: note: expanded from macro 'BOOST_PP_REPEAT_1_3' # define BOOST_PP_REPEAT_1_3(m, d) BOOST_PP_REPEAT_1_2(m, d) m(2, 2, d) ^ ../../Staging/type_erasure/boost/type_erasure/detail/instantiate.hpp:70:47: note: expanded from macro 'BOOST_TYPE_ERASURE_INSTANTIATE_IMPL' (void)&::boost::mpl::at_c<data, n>::type::apply; ^ ../../Staging/type_erasure/boost/type_erasure/any.hpp:182:13: note: in instantiation of function template specialization 'boost::type_erasure::detail::instantiate_concept3::apply<boost::mpl::vector<boost::type_erasure::copy_constructible<boost::type_erasure::_self>, drawable<boost::type_erasure::_self, std::__1::basic_ostream<char> >, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na>, boost::mpl::map1<boost::mpl::pair<boost::type_erasure::_self, int> > >' requested here BOOST_TYPE_ERASURE_INSTANTIATE1(Concept, T, U), ^ ../../Staging/type_erasure/boost/type_erasure/detail/instantiate.hpp:51:14: note: expanded from macro 'BOOST_TYPE_ERASURE_INSTANTIATE1' >::type::apply( \ ^ /usr/bin/../lib/c++/v1/memory:1681:31: note: in instantiation of function template specialization 'boost::type_erasure::any<boost::mpl::vector<boost::type_erasure::copy_constructible<boost::type_erasure::_self>, drawable<boost::type_erasure::_self, std::__1::basic_ostream<char> >, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na>, boost::type_erasure::_self>::any<int>' requested here ::new((void*)__p) _Up(_VSTD::forward<_Args>(__args)...); ^ /usr/bin/../lib/c++/v1/memory:1608:18: note: in instantiation of function template specialization 'std::__1::allocator<boost::type_erasure::any<boost::mpl::vector<boost::type_erasure::copy_constructible<boost::type_erasure::_self>, drawable<boost::type_erasure::_self, std::__1::basic_ostream<char> >, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na>, boost::type_erasure::_self> >::construct<boost::type_erasure::any<boost::mpl::vector<boost::type_erasure::copy_constructible<boost::type_erasure::_self>, drawable<boost::type_erasure::_self, std::__1::basic_ostream<char> >, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na>, boost::type_erasure::_self>, int>' requested here {__a.construct(__p, _VSTD::forward<_Args>(__args)...);} ^ /usr/bin/../lib/c++/v1/memory:1492:14: note: in instantiation of function template specialization 'std::__1::allocator_traits<std::__1::allocator<boost::type_erasure::any<boost::mpl::vector<boost::type_erasure::copy_constructible<boost::type_erasure::_self>, drawable<boost::type_erasure::_self, std::__1::basic_ostream<char> >, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na>, boost::type_erasure::_self> > >::__construct<boost::type_erasure::any<boost::mpl::vector<boost::type_erasure::copy_constructible<boost::type_erasure::_self>, drawable<boost::type_erasure::_self, std::__1::basic_ostream<char> >, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na>, boost::type_erasure::_self>, int>' requested here {__construct(__has_construct<allocator_type, pointer, _Args...>(), ^ /usr/bin/../lib/c++/v1/vector:1519:25: note: in instantiation of function template specialization 'std::__1::allocator_traits<std::__1::allocator<boost::type_erasure::any<boost::mpl::vector<boost::type_erasure::copy_constructible<boost::type_erasure::_self>, drawable<boost::type_erasure::_self, std::__1::basic_ostream<char> >, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na>, boost::type_erasure::_self> > >::construct<boost::type_erasure::any<boost::mpl::vector<boost::type_erasure::copy_constructible<boost::type_erasure::_self>, drawable<boost::type_erasure::_self, std::__1::basic_ostream<char> >, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na>, boost::type_erasure::_self>, int>' requested here __alloc_traits::construct(this->__alloc(), ^ te_sp_copy.cpp:71:15: note: in instantiation of function template specialization 'std::__1::vector<boost::type_erasure::any<boost::mpl::vector<boost::type_erasure::copy_constructible<boost::type_erasure::_self>, drawable<boost::type_erasure::_self, std::__1::basic_ostream<char> >, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na>, boost::type_erasure::_self>, std::__1::allocator<boost::type_erasure::any<boost::mpl::vector<boost::type_erasure::copy_constructible<boost::type_erasure::_self>, drawable<boost::type_erasure::_self, std::__1::basic_ostream<char> >, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na>, boost::type_erasure::_self> > >::emplace_back<int>' requested here current(h).emplace_back(0); ^ te_sp_copy.cpp:33:6: note: 'draw' should be declared prior to the call site void draw(const int& value, std::ostream& out, size_t position) { ^ te_sp_copy.cpp:14:59: error: call to function 'draw' that is neither visible in the template definition nor found by argument-dependent lookup static void apply(const OBJ& obj, T& os, size_t pos) { draw(obj, os, pos); } ^ ../../Staging/type_erasure/boost/type_erasure/detail/instantiate.hpp:91:28: note: in instantiation of member function 'drawable<std::__1::basic_string<char>, std::__1::basic_ostream<char> >::apply' requested here BOOST_PP_REPEAT(N, BOOST_TYPE_ERASURE_INSTANTIATE_IMPL, concept_sequence) ^ /usr/local/include/boost/preprocessor/repetition/repeat.hpp:38:60: note: expanded from macro 'BOOST_PP_REPEAT_1' # define BOOST_PP_REPEAT_1(c, m, d) BOOST_PP_REPEAT_1_I(c, m, d) ^ /usr/local/include/boost/preprocessor/repetition/repeat.hpp:43:63: note: expanded from macro 'BOOST_PP_REPEAT_1_I' # define BOOST_PP_REPEAT_1_I(c, m, d) BOOST_PP_REPEAT_1_ ## c(m, d) ^ /usr/local/include/boost/preprocessor/repetition/repeat.hpp:54:62: note: expanded from macro 'BOOST_PP_REPEAT_1_3' # define BOOST_PP_REPEAT_1_3(m, d) BOOST_PP_REPEAT_1_2(m, d) m(2, 2, d) ^ ../../Staging/type_erasure/boost/type_erasure/detail/instantiate.hpp:70:47: note: expanded from macro 'BOOST_TYPE_ERASURE_INSTANTIATE_IMPL' (void)&::boost::mpl::at_c<data, n>::type::apply; ^ ../../Staging/type_erasure/boost/type_erasure/any.hpp:182:13: note: in instantiation of function template specialization 'boost::type_erasure::detail::instantiate_concept3::apply<boost::mpl::vector<boost::type_erasure::copy_constructible<boost::type_erasure::_self>, drawable<boost::type_erasure::_self, std::__1::basic_ostream<char> >, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na>, boost::mpl::map1<boost::mpl::pair<boost::type_erasure::_self, std::__1::basic_string<char> > > >' requested here BOOST_TYPE_ERASURE_INSTANTIATE1(Concept, T, U), ^ ../../Staging/type_erasure/boost/type_erasure/detail/instantiate.hpp:51:14: note: expanded from macro 'BOOST_TYPE_ERASURE_INSTANTIATE1' >::type::apply( \ ^ /usr/bin/../lib/c++/v1/memory:1681:31: note: in instantiation of function template specialization 'boost::type_erasure::any<boost::mpl::vector<boost::type_erasure::copy_constructible<boost::type_erasure::_self>, drawable<boost::type_erasure::_self, std::__1::basic_ostream<char> >, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na>, boost::type_erasure::_self>::any<std::__1::basic_string<char> >' requested here ::new((void*)__p) _Up(_VSTD::forward<_Args>(__args)...); ^ /usr/bin/../lib/c++/v1/memory:1608:18: note: in instantiation of function template specialization 'std::__1::allocator<boost::type_erasure::any<boost::mpl::vector<boost::type_erasure::copy_constructible<boost::type_erasure::_self>, drawable<boost::type_erasure::_self, std::__1::basic_ostream<char> >, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na>, boost::type_erasure::_self> >::construct<boost::type_erasure::any<boost::mpl::vector<boost::type_erasure::copy_constructible<boost::type_erasure::_self>, drawable<boost::type_erasure::_self, std::__1::basic_ostream<char> >, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na>, boost::type_erasure::_self>, std::__1::basic_string<char> >' requested here {__a.construct(__p, _VSTD::forward<_Args>(__args)...);} ^ /usr/bin/../lib/c++/v1/memory:1492:14: note: in instantiation of function template specialization 'std::__1::allocator_traits<std::__1::allocator<boost::type_erasure::any<boost::mpl::vector<boost::type_erasure::copy_constructible<boost::type_erasure::_self>, drawable<boost::type_erasure::_self, std::__1::basic_ostream<char> >, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na>, boost::type_erasure::_self> > >::__construct<boost::type_erasure::any<boost::mpl::vector<boost::type_erasure::copy_constructible<boost::type_erasure::_self>, drawable<boost::type_erasure::_self, std::__1::basic_ostream<char> >, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na>, boost::type_erasure::_self>, std::__1::basic_string<char> >' requested here {__construct(__has_construct<allocator_type, pointer, _Args...>(), ^ /usr/bin/../lib/c++/v1/vector:1519:25: note: in instantiation of function template specialization 'std::__1::allocator_traits<std::__1::allocator<boost::type_erasure::any<boost::mpl::vector<boost::type_erasure::copy_constructible<boost::type_erasure::_self>, drawable<boost::type_erasure::_self, std::__1::basic_ostream<char> >, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na>, boost::type_erasure::_self> > >::construct<boost::type_erasure::any<boost::mpl::vector<boost::type_erasure::copy_constructible<boost::type_erasure::_self>, drawable<boost::type_erasure::_self, std::__1::basic_ostream<char> >, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na>, boost::type_erasure::_self>, std::__1::basic_string<char> >' requested here __alloc_traits::construct(this->__alloc(), ^ te_sp_copy.cpp:72:15: note: in instantiation of function template specialization 'std::__1::vector<boost::type_erasure::any<boost::mpl::vector<boost::type_erasure::copy_constructible<boost::type_erasure::_self>, drawable<boost::type_erasure::_self, std::__1::basic_ostream<char> >, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na>, boost::type_erasure::_self>, std::__1::allocator<boost::type_erasure::any<boost::mpl::vector<boost::type_erasure::copy_constructible<boost::type_erasure::_self>, drawable<boost::type_erasure::_self, std::__1::basic_ostream<char> >, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na>, boost::type_erasure::_self> > >::emplace_back<std::__1::basic_string<char> >' requested here current(h).emplace_back(std::string("Hello!")); ^ te_sp_copy.cpp:37:6: note: 'draw' should be declared prior to the call site void draw(const std::string& value, std::ostream& out, size_t position) { ^ 2 errors generated.

2 3

[gil::io] Feedback for scanline_read_iterator
by Christian Henning 25 Feb '13

25 Feb '13

Hi all, I'm getting close to finally commit the new io extension for boost::gil. As it was required from the boost review I have implemented a basic image_read_iterator to read large images. I would like to get some feedback on my interface and maybe on the actual implementation, as well. I must admit this is my first iterator that I have designed and implemented from scratch with some help by other people. The latest io code can be found here via svn: http://code.google.com/p/gil-contributions/source/browse/#svn%2Ftrunk%2Fgil… A basic usage of the code is here: http://pastebin.com/3E7KpfwE Thanks! Christian

7 51

[utility]proposal for a small utility of namespace
by law chrono 25 Feb '13

25 Feb '13

I like c++ and boost，but write namespace is a boring work for brace-matching. So I write a small util with boost.preprocessor, like below: #ifndef BOOST_NAMESPACE_UTILITY_HPP_ #define BOOST_NAMESPACE_UTILITY_HPP_ #include <boost/preprocessor/seq/for_each.hpp> #define _PP_NS_BEGIN_FUNC(r,data,elem) namespace elem { #define _PP_NS_END_FUNC(r,data,elem) } #define BOOST_BEGIN_NAMESPACE(SEQ) \ BOOST_PP_SEQ_FOR_EACH(_PP_NS_BEGIN_FUNC, ~, SEQ) #define BOOST_ END_ NAMESPACE (SEQ) \ BOOST_PP_SEQ_FOR_EACH(_PP_NS_END_FUNC, ~, SEQ) #endif //BOOST_NAMESPACE_UTILITY_HPP_ Then the code can be more clear and easy-reading: BOOST_BEGIN_NAMESPACE((boost)(asio)(ip)) //namespace boost{namespace asio{namespace ip{ ... //to something BOOST_END_NAMESPACE((boost)(asio)(ip)) //}}} c++11 inline namespace also can work: inline BOOST_BEGIN_NAMESPACE((detail)) ... //to something BOOST_END_NAMESPACE((detail)) I wander to know whether this util could be a part of boost. Thanks a lot.

3 2

[thread|shared_ptr|atomic] segmentation fault in exception_ptr assignment
by Oliver Kowalke 24 Feb '13

24 Feb '13

I've replaced shared_ptr<> by intrusive_ptr<> + atomic< std::size_t > in boost.thread's future implementation. atomic< std::size_t > use_count; // initialized with '0' in ctor friend inline void intrusive_ptr_add_ref( future_continuation_base * p) BOOST_NOEXCEPT { ++p->use_count; // should be seq_cst } friend inline void intrusive_ptr_release( future_continuation_base * p) { if ( 0 == --p->use_count) // should be seq_cst delete p; } I get an error if I compile the code with gcc-4.7.2 on x86_64: segmentation fault backtrace: 0x0000000000426a96 in boost::detail::atomic_exchange_and_add (pw=0x436a40, dv=-1) at ../../../boost/smart_ptr/detail/sp_counted_base_gcc_x86.hpp:50 50 ); (gdb) bt #0 0x0000000000426a96 in boost::detail::atomic_exchange_and_add (pw=0x436a40, dv=-1) at ../../../boost/smart_ptr/detail/sp_counted_base_gcc_x86.hpp:50 #1 0x0000000000426ba7 in boost::detail::sp_counted_base::release (this=0x436a38) at ../../../boost/smart_ptr/detail/sp_counted_base_gcc_x86.hpp:143 #2 0x0000000000426c57 in boost::detail::shared_count::~shared_count (this=0x7fffffffc868, __in_chrg=<optimized out>) at ../../../boost/smart_ptr/detail/shared_count.hpp:368 #3 0x0000000000427c3e in boost::shared_ptr<boost::exception_detail::clone_base const>::~shared_ptr (this=0x7fffffffc860, __in_chrg=<optimized out>) at ../../../boost/smart_ptr/shared_ptr.hpp:316 #4 0x000000000042b2cd in boost::shared_ptr<boost::exception_detail::clone_base const>::operator= (this=0x75df00, r=...) at ../../../boost/smart_ptr/shared_ptr.hpp:485 #5 0x0000000000427d6f in boost::exception_ptr::operator= (this=0x75df00, other=...) at ../../../boost/exception/detail/exception_ptr.hpp:73 #6 0x0000000000429a2f in boost::fibers::detail::future_object_base::mark_exceptional_finish_internal (this=0x75def0, e=..., lock=...) at ../../../boost/fiber/future.hpp:278 #7 0x000000000043749a in boost::fibers::detail::task_base<int>::owner_destroyed (this=0x75def0) at ../../../boost/fiber/future.hpp:1241 #8 0x000000000042e768 in boost::fibers::packaged_task<int>::~packaged_task (this=0x7fffffffc9b0, __in_chrg=<optimized out>) at ../../../boost/fiber/future.hpp:1341 called funtions: ~packaged_task() -> task_base::owner_destroyed() -> future_object_base::mark_exceptional_finish_internal() -> exception_ptr::operator=(excepton_ptr const&) -> shared_ptr -> shared_count -> sp_counted_base_gcc_x86 -> boost::detail::atomic_exchange_and_add() I'm wondering why a simple assignement of excpetion_ptr causes a segmentation fault if future's implementation uses intrusive_ptr + atomic + sequential - consistent ops instead of shared_ptr. Does someone have an explanation?

2 1

[thread] ~condition_variable_any verifications
by Tim Blechmann 24 Feb '13

24 Feb '13

hi, one of my project uses exit() to terminate the program. this is sometimes called while some threads are waiting on a global condition_variable_any. when calling exit(), this global variable is destroyed while other threads are still waiting on it, which causes BOOST_VERIFY to fire an assertion failure !pthread_cond_destroy(&cond). this scares the hell out of my users. i know that these verifications can be really useful in many case, but in my use case, it makes exit() rather unusable, and i'd have to redesign some of the internal logic to avoid this assertion failure. thoughts? thnx, tim

4 5

[lexical_cast][math] can't unconditionally call math::changesign with long double
by Eric Niebler 24 Feb '13

24 Feb '13

lexical_cast is using math::changesign with long double regardless of whether BOOST_MATH_NO_LONG_DOUBLE_MATH_FUNCTIONS is defined or not. This is causing Boost.Test build problems (see here http://tinyurl.com/af5453h) I'm pretty sure this is a bug in lexical_cast, so I've opened a ticket: https://svn.boost.org/trac/boost/ticket/8162 I've assigned it to the last person to touch lexical_cast.hpp. Apologies if that's not right. There is no entry for lexical_cast in libs/maintainers.txt. -- Eric Niebler Boost.org http://www.boost.org

6 6

[tuple] - Move constructors for Tuple
by Moore, Andrew 23 Feb '13

23 Feb '13

Are there plans for move constructors/assignment operations in the tuples library?

4 8