December 2019 - Boost-users

Boost.Numeric.Interval: Please specify rounding control mechanism
by Bastien Commelongue 02 Dec '20

02 Dec '20

Hello, I am building an app for IOS (ARM) and I had this issue while compiling: *Boost.Numeric.Interval: Please specify rounding control mechanism.* C99 version should be used in this case but __USE_ISOC99 is not defined. Modifying the condition with this code (using __cplusplus) fixed the issue: *boost/numeric/interval/hw_rounding.hpp(36)* *#if defined(BOOST_NUMERIC_INTERVAL_NO_HARDWARE) && (defined(__USE_ISOC99) || defined(__MSL__) || (defined __cplusplus && __cplusplus >= 201103L))# include <boost/numeric/interval/detail/c99_rounding_control.hpp>#endif* Let me know if I missed something or if you plan to integrate this modification in a next version. Cheers, Bastien Commelongue

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[review][STLInterfaces] STLInterfaces review results
by Barrett Adair 26 Dec '19

26 Dec '19

Many thanks are owed to all who participated in the formal review of Zach Laine's STLInterfaces library, especially during this busy holiday season: * Hadriel Kaplan - ACCEPT * Andreas Wass - ACCEPT * Rainer Deyke - ACCEPT * Arthur Gruzauskas - ACCEPT * Krystian Stasiowski - ACCEPT * Daniela Engert - CONDITIONALLY ACCEPT * Gavin Lambert - Technical comments First, a summary of the reviews: 1. Design Reviewers were unanimous in their appreciation for the design. Krystian had the only asterisk about the design, noting that derived class members should ideally be SFINAE-detected, where the library feature would SFINAE where the corresponding required derived feature detection fails. I have a different opinion about this, but we can discuss that elsewhere. 2. Implementation The container_interface destructor and the optional dependency on cmcstl2 were snags for multiple reviewers. Several compile errors were discovered that need to be addressed. 3. Documentation Reviewers found the documentation to be "ok". A common request was for better organization of derived-class requirements, particularly with the container_interface template. Reviewers also lamented the lack of training wheels for the subject matter. 4. Tests Hadriel noted the lack of non-copyable value_type tests, while Daniela noted the lack of Boost.Build support. Hadriel was the only one who commented on the quality of tests ("good"), and the only one who ran them. Arthur did his own testing, to satisfaction. I appreciate the presence of SFINAE-friendliness tests and the continuous integration. 5. Usefulness Reviewers appreciated the usefulness of the library. Arthur is "using it happily", while others found it "very useful", "fairly useful", or of "high" usefulness. However, Krystian's response implied that this library may not be as useful for containers needing extreme performance. The reviews clearly demonstrate a consensus. Accordingly, I'm pleased to announce that STLInterfaces is CONDITIONALLY ACCEPTED as a Boost library. Conditions for acceptance: 1. Remove optional dependency on cmcstl2 (issue #27) 2. Add Boost license comments to all files, including appveyor.yml, .travis.yml, README.md, */CMakeLists.txt (issue #26) 3. Support Boost.Build (issue #25) 4. Replace googletest with Boost equivalent (issue #24) 5. Remove usage of non-existent v2_dtl members in container_interface.hpp (issue #22) 6. Include <tuple> for std::tie usage in C++14 mode (issue #21) 7. Fix dangling parens in container_inteface.hpp:731 (issue #20) 8. Make Concepts usage C++20-conformant (issue #13) 9. Remove the destructor in container_interface (issue #12) 10. Add tests for non-copyable value types (issue #30) Suggestions: 1. Explicitly document the signatures and return types of functions provided by base class templates (issue #23) 2. Mention the C++20 generator pattern in documentation (issue #19) 3. Document the library's interactions with Ranges (issue #18) 4. Remove unnecessary comments (issue #17) 5. Investigate compile error in VS2015 (msvc 19.0.3) due to issues with noexcept() operator in function overloading (issue #16) 6. Rename container_interface to sequence_container_interface (issue #15) 7. Change the 'contiguous' bool to an enum (issue #14) 8. Document the relationship between value_type operator== and containter_interface-defined operator== (issue #11) 9. Improve table/section names for better navigation of container_interface tutorial (issue #10) 10. Clean up BOOST_STL_INTERFACES_DOXYGEN usage (issue #28) 11. Split up fwd.hpp into multiple headers (issue #29) 12. Document optimization trade-offs of proxy_iterator_interface (issue #30) Rationale: 1. Condition #1 is, I feel, the appropriate default as review manager. If Zach feels strongly about keeping the optional dependency on cmcstl2, we should discuss. 2. Unless the library requirements webpage has fallen out of date, new libraries must still support Boost.Build. 3. A not-so-quick grep of current Boost libraries yields no `gtest` results. I assume that we do not allow googletest as the sole test framework in a library. 4. The other conditions should be self-explanatory. Thank you Zach for your contributions, and I look forward to working with you to add this library into Boost. Regards, Barrett Adair

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[boost] Merry Christmas!
by Vinnie Falco 26 Dec '19

26 Dec '19

Merry Christmas to all my fellow boost authors and wonderful users! God bless everyone as we celebrate the birth of Jesus Christ. And as we go into the new year I would like to give a humble and very friendly reminder: Boost.JSON needs a review manager! Blessings always Vinnie

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Re: [Boost-users] Boost 1.72.0 build fail with Visual Studio 2019 16.4
by Leo Carreon 25 Dec '19

25 Dec '19

I was able to eliminate most of the error messages during compilation by modifying the contents of boost\asio\detail\config.hpp. I changed this line from: # define BOOST_ASIO_CONCEPT concept bool to # define BOOST_ASIO_CONCEPT concept After the above change, there are still two error messages from boost\asio\async_result.hpp lines 70 and 492. The issue in these lines is they are defining a concept that is also using a concept in one of their arguments which I think is not allowed by the standard. I am not up to speed yet with concept definitions therefore I have not been able to resolve this remaining issue. From: Leo Carreon Sent: Tuesday, December 24, 2019 2:37 PM To: Boost Users Mailing List Subject: Boost 1.72.0 build fail with Visual Studio 2019 16.4 Hi Boost Users, I am building Boost 1.72.0 in 64-bit mode with the flag /std:c++latest using Visual Studio 2019 16.4.2 and I am encountering the following issues: .\boost/asio/async_result.hpp(44): error C2062: type 'bool' unexpected .\boost/asio/async_result.hpp(45): error C2143: syntax error: missing ';' before '{' .\boost/asio/async_result.hpp(45): error C2447: '{': missing function header (old-style formal list?) .\boost/asio/async_result.hpp(56): error C7568: argument list missing after assumed function template 'callable_with' .\boost/asio/async_result.hpp(58): note: see reference to class template instantiation 'boost::asio::detail::is_completion_handler_for<T,R(Args...)>' being compiled .\boost/asio/async_result.hpp(56): error C2059: syntax error: '>' .\boost/asio/async_result.hpp(57): error C3770: 'unknown-type': is not a valid base class .\boost/asio/async_result.hpp(63): error C2062: type 'bool' unexpected .\boost/asio/async_result.hpp(64): error C2065: 'T': undeclared identifier .\boost/asio/async_result.hpp(64): error C2923: 'boost::asio::detail::is_completion_signature': 'T' is not a valid template type argument for parameter 'T' .\boost/asio/async_result.hpp(64): error C2955: 'boost::asio::detail::is_completion_signature': use of class template requires template argument list .\boost/asio/async_result.hpp(34): note: see declaration of 'boost::asio::detail::is_completion_signature' .\boost/asio/async_result.hpp(69): error C2061: syntax error: identifier 'completion_signature' .\boost/asio/async_result.hpp(70): error C2062: type 'bool' unexpected .\boost/asio/async_result.hpp(71): error C2065: 'T': undeclared identifier .\boost/asio/async_result.hpp(71): error C2065: 'Signature': undeclared identifier .\boost/asio/async_result.hpp(71): error C2923: 'boost::asio::detail::is_completion_handler_for': 'T' is not a valid template type argument for parameter 'T' .\boost/asio/async_result.hpp(71): error C2923: 'boost::asio::detail::is_completion_handler_for': 'Signature' is not a valid template type argument for parameter 'Signature' .\boost/asio/async_result.hpp(71): error C2955: 'boost::asio::detail::is_completion_handler_for': use of class template requires template argument list .\boost/asio/async_result.hpp(50): note: see declaration of 'boost::asio::detail::is_completion_handler_for' .\boost/asio/async_result.hpp(105): error C2039: 'completion_signature': is not a member of 'boost::asio' .\boost/asio/async_result.hpp(25): note: see declaration of 'boost::asio' .\boost/asio/async_result.hpp(105): error C2061: syntax error: identifier 'completion_signature' .\boost/asio/async_result.hpp(144): error C2061: syntax error: identifier 'completion_handler_for' .\boost/asio/async_result.hpp(190): note: see reference to class template instantiation 'boost::asio::async_result<CompletionToken>' being compiled .\boost/asio/async_result.hpp(144): error C2988: unrecognizable template declaration/definition .\boost/asio/async_result.hpp(144): error C2059: syntax error: ',' .\boost/asio/async_result.hpp(150): error C2334: unexpected token(s) preceding '{'; skipping apparent function body .\boost/asio/async_result.hpp(194): error C2039: 'completion_signature': is not a member of 'boost::asio' .\boost/asio/async_result.hpp(25): note: see declaration of 'boost::asio' .\boost/asio/async_result.hpp(194): error C2061: syntax error: identifier 'completion_signature' .\boost/asio/async_result.hpp(195): error C2065: 'Signature': undeclared identifier .\boost/asio/async_result.hpp(196): error C2977: 'boost::asio::async_result': too many template arguments .\boost/asio/async_result.hpp(107): note: see declaration of 'boost::asio::async_result' .\boost/asio/async_result.hpp(198): error C2913: explicit specialization; 'boost::asio::async_result' is not a specialization of a class template .\boost/asio/async_result.hpp(205): error C2039: 'completion_signature': is not a member of 'boost::asio' .\boost/asio/async_result.hpp(25): note: see declaration of 'boost::asio' .\boost/asio/async_result.hpp(205): error C2061: syntax error: identifier 'completion_signature' .\boost/asio/async_result.hpp(211): error C2065: 'Signature': undeclared identifier .\boost/asio/async_result.hpp(251): note: see reference to class template instantiation 'boost::asio::async_completion<CompletionToken>' being compiled .\boost/asio/async_result.hpp(250): error C2065: 'Signature': undeclared identifier .\boost/asio/async_result.hpp(250): error C2955: 'boost::asio::async_result': use of class template requires template argument list .\boost/asio/async_result.hpp(195): note: see declaration of 'boost::asio::async_result' .\boost/asio/async_result.hpp(258): error C2955: 'boost::asio::async_result': use of class template requires template argument list .\boost/asio/async_result.hpp(195): note: see declaration of 'boost::asio::async_result' .\boost/asio/async_result.hpp(259): note: see reference to class template instantiation 'boost::asio::detail::async_result_helper<CompletionToken,Signature>' being compiled .\boost/asio/async_result.hpp(288): error C2672: 'boost::asio::detail::async_result_initiate_memfn_helper': no matching overloaded function found .\boost/asio/async_result.hpp(292): note: see reference to class template instantiation 'boost::asio::detail::async_result_has_initiate_memfn<CompletionToken,Signature>' being compiled .\boost/asio/async_result.hpp(290): error C3206: 'boost::asio::detail::async_result_initiate_memfn_helper': invalid template argument for 'T', missing template argument list on class template 'boost::asio::async_result' .\boost/asio/async_result.hpp(281): note: see declaration of 'boost::asio::detail::async_result_initiate_memfn_helper' .\boost/asio/async_result.hpp(290): error C3206: 'boost::asio::detail::async_result_initiate_memfn_helper': invalid template argument for '<unnamed-symbol>', missing template argument list on class template 'boost::asio::async_result' .\boost/asio/async_result.hpp(278): note: see declaration of 'boost::asio::detail::async_result_initiate_memfn_helper' .\boost/asio/async_result.hpp(350): error C2039: 'completion_signature': is not a member of 'boost::asio' .\boost/asio/async_result.hpp(25): note: see declaration of 'boost::asio' .\boost/asio/async_result.hpp(350): error C2061: syntax error: identifier 'completion_signature' .\boost/asio/async_result.hpp(353): error C2065: 'Signature': undeclared identifier .\boost/asio/async_result.hpp(353): error C2923: 'boost::asio::detail::async_result_has_initiate_memfn': 'Signature' is not a valid template type argument for parameter 'Signature' .\boost/asio/async_result.hpp(354): error C2760: syntax error: unexpected token '>', expected 'expression' .\boost/asio/async_result.hpp(359): error C2065: 'Initiation': undeclared identifier .\boost/asio/async_result.hpp(359): error C2065: 'initiation': undeclared identifier .\boost/asio/async_result.hpp(360): error C2065: 'token': undeclared identifier .\boost/asio/async_result.hpp(361): error C2065: 'Args': undeclared identifier .\boost/asio/async_result.hpp(361): warning C4346: 'boost::asio::detail::async_result_has_initiate_memfn::value': dependent name is not a type .\boost/asio/async_result.hpp(361): note: prefix with 'typename' to indicate a type .\boost/asio/async_result.hpp(361): error C2988: unrecognizable template declaration/definition .\boost/asio/async_result.hpp(361): error C2059: syntax error: '...' .\boost/asio/async_result.hpp(362): error C2143: syntax error: missing ';' before '{' .\boost/asio/async_result.hpp(362): error C2447: '{': missing function header (old-style formal list?) .\boost/asio/async_result.hpp(370): error C2039: 'completion_signature': is not a member of 'boost::asio' .\boost/asio/async_result.hpp(25): note: see declaration of 'boost::asio' .\boost/asio/async_result.hpp(370): error C2061: syntax error: identifier 'completion_signature' .\boost/asio/async_result.hpp(373): error C2065: 'Signature': undeclared identifier .\boost/asio/async_result.hpp(373): error C2923: 'boost::asio::detail::async_result_has_initiate_memfn': 'Signature' is not a valid template type argument for parameter 'Signature' .\boost/asio/async_result.hpp(374): error C2065: 'Signature': undeclared identifier .\boost/asio/async_result.hpp(375): error C2065: 'Initiation': undeclared identifier .\boost/asio/async_result.hpp(375): error C2065: 'initiation': undeclared identifier .\boost/asio/async_result.hpp(376): error C2065: 'token': undeclared identifier .\boost/asio/async_result.hpp(377): error C2065: 'Args': undeclared identifier .\boost/asio/async_result.hpp(377): warning C4346: 'boost::asio::detail::async_result_has_initiate_memfn::value': dependent name is not a type .\boost/asio/async_result.hpp(377): note: prefix with 'typename' to indicate a type .\boost/asio/async_result.hpp(377): error C2988: unrecognizable template declaration/definition .\boost/asio/async_result.hpp(377): error C2059: syntax error: '...' .\boost/asio/async_result.hpp(378): error C2143: syntax error: missing ';' before '{' .\boost/asio/async_result.hpp(378): error C2447: '{': missing function header (old-style formal list?) .\boost/asio/async_result.hpp(483): error C7568: argument list missing after assumed function template 'completion_handler_for' .\boost/asio/async_result.hpp(487): note: see reference to class template instantiation 'boost::asio::detail::initiation_archetype<Signature>' being compiled .\boost/asio/async_result.hpp(484): error C2061: syntax error: identifier 'CompletionHandler' .\boost/asio/async_result.hpp(491): error C2061: syntax error: identifier 'completion_signature' .\boost/asio/async_result.hpp(492): error C2062: type 'bool' unexpected .\boost/asio/async_result.hpp(493): error C2143: syntax error: missing ';' before '{' .\boost/asio/async_result.hpp(493): error C2447: '{': missing function header (old-style formal list?) .\boost/asio/post.hpp(56): error C2039: 'completion_token_for': is not a member of 'boost::asio' .\boost/asio/post.hpp(27): note: see declaration of 'boost::asio' .\boost/asio/post.hpp(56): error C2061: syntax error: identifier 'completion_token_for' .\boost/asio/post.hpp(56): error C2988: unrecognizable template declaration/definition .\boost/asio/post.hpp(56): error C2059: syntax error: '>' .\boost/asio/post.hpp(94): error C2039: 'completion_token_for': is not a member of 'boost::asio' .\boost/asio/post.hpp(27): note: see declaration of 'boost::asio' .\boost/asio/post.hpp(94): error C2061: syntax error: identifier 'completion_token_for' .\boost/asio/post.hpp(95): error C2988: unrecognizable template declaration/definition .\boost/asio/post.hpp(95): error C2059: syntax error: '>' .\boost/asio/post.hpp(107): error C2039: 'completion_token_for': is not a member of 'boost::asio' .\boost/asio/post.hpp(27): note: see declaration of 'boost::asio' .\boost/asio/post.hpp(107): error C2061: syntax error: identifier 'completion_token_for' .\boost/asio/post.hpp(108): error C2988: unrecognizable template declaration/definition .\boost/asio/post.hpp(108): error C2059: syntax error: '>' .\boost/asio/impl/post.hpp(81): error C2039: 'completion_token_for': is not a member of 'boost::asio' .\boost/asio/impl/post.hpp(26): note: see declaration of 'boost::asio' .\boost/asio/impl/post.hpp(81): error C2061: syntax error: identifier 'completion_token_for' .\boost/asio/impl/post.hpp(81): error C2988: unrecognizable template declaration/definition .\boost/asio/impl/post.hpp(81): error C2059: syntax error: '>' .\boost/asio/impl/post.hpp(84): error C2143: syntax error: missing ';' before '{' .\boost/asio/impl/post.hpp(84): error C2447: '{': missing function header (old-style formal list?) .\boost/asio/impl/post.hpp(90): error C2039: 'completion_token_for': is not a member of 'boost::asio' .\boost/asio/impl/post.hpp(26): note: see declaration of 'boost::asio' .\boost/asio/impl/post.hpp(90): error C2061: syntax error: identifier 'completion_token_for' .\boost/asio/impl/post.hpp(90): error C2988: unrecognizable template declaration/definition .\boost/asio/impl/post.hpp(90): error C2059: syntax error: '>' .\boost/asio/impl/post.hpp(94): error C2143: syntax error: missing ';' before '{' .\boost/asio/impl/post.hpp(94): error C2447: '{': missing function header (old-style formal list?) .\boost/asio/impl/post.hpp(100): error C2039: 'completion_token_for': is not a member of 'boost::asio' .\boost/asio/impl/post.hpp(26): note: see declaration of 'boost::asio' .\boost/asio/impl/post.hpp(100): error C2061: syntax error: identifier 'completion_token_for' .\boost/asio/impl/post.hpp(100): error C2988: unrecognizable template declaration/definition .\boost/asio/impl/post.hpp(100): error C2059: syntax error: '>' .\boost/asio/impl/post.hpp(105): error C2143: syntax error: missing ';' before '{' .\boost/asio/impl/post.hpp(105): error C2447: '{': missing function header (old-style formal list?) .\boost/asio/detail/buffer_sequence_adapter.hpp(106): error C2955: 'boost::asio::detail::buffer_sequence_adapter_base': use of class template requires template argument list .\boost/asio/detail/buffer_sequence_adapter.hpp(30): note: see declaration of 'boost::asio::detail::buffer_sequence_adapter_base' .\boost/asio/detail/buffer_sequence_adapter.hpp(208): note: see reference to class template instantiation 'boost::asio::detail::buffer_sequence_adapter<Buffer,Buffers>' being compiled .\boost/asio/detail/buffer_sequence_adapter.hpp(116): error C2143: syntax error: missing ';' before '*' .\boost/asio/detail/buffer_sequence_adapter.hpp(116): fatal error C1003: error count exceeds 100; stopping compilation Has anyone else encountered the same issues and how to resolve them? It appears that the macro BOOST_ASIO_CONCEPT is the one causing the issue. This macro seems to have the value “concept bool” which causes the complaint from the compiler. Kind regards, Leo

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Boost 1.72.0 build fail with Visual Studio 2019 16.4
by Leo Carreon 25 Dec '19

25 Dec '19

Hi Boost Users, I am building Boost 1.72.0 in 64-bit mode with the flag /std:c++latest using Visual Studio 2019 16.4.2 and I am encountering the following issues: .\boost/asio/async_result.hpp(44): error C2062: type 'bool' unexpected .\boost/asio/async_result.hpp(45): error C2143: syntax error: missing ';' before '{' .\boost/asio/async_result.hpp(45): error C2447: '{': missing function header (old-style formal list?) .\boost/asio/async_result.hpp(56): error C7568: argument list missing after assumed function template 'callable_with' .\boost/asio/async_result.hpp(58): note: see reference to class template instantiation 'boost::asio::detail::is_completion_handler_for<T,R(Args...)>' being compiled .\boost/asio/async_result.hpp(56): error C2059: syntax error: '>' .\boost/asio/async_result.hpp(57): error C3770: 'unknown-type': is not a valid base class .\boost/asio/async_result.hpp(63): error C2062: type 'bool' unexpected .\boost/asio/async_result.hpp(64): error C2065: 'T': undeclared identifier .\boost/asio/async_result.hpp(64): error C2923: 'boost::asio::detail::is_completion_signature': 'T' is not a valid template type argument for parameter 'T' .\boost/asio/async_result.hpp(64): error C2955: 'boost::asio::detail::is_completion_signature': use of class template requires template argument list .\boost/asio/async_result.hpp(34): note: see declaration of 'boost::asio::detail::is_completion_signature' .\boost/asio/async_result.hpp(69): error C2061: syntax error: identifier 'completion_signature' .\boost/asio/async_result.hpp(70): error C2062: type 'bool' unexpected .\boost/asio/async_result.hpp(71): error C2065: 'T': undeclared identifier .\boost/asio/async_result.hpp(71): error C2065: 'Signature': undeclared identifier .\boost/asio/async_result.hpp(71): error C2923: 'boost::asio::detail::is_completion_handler_for': 'T' is not a valid template type argument for parameter 'T' .\boost/asio/async_result.hpp(71): error C2923: 'boost::asio::detail::is_completion_handler_for': 'Signature' is not a valid template type argument for parameter 'Signature' .\boost/asio/async_result.hpp(71): error C2955: 'boost::asio::detail::is_completion_handler_for': use of class template requires template argument list .\boost/asio/async_result.hpp(50): note: see declaration of 'boost::asio::detail::is_completion_handler_for' .\boost/asio/async_result.hpp(105): error C2039: 'completion_signature': is not a member of 'boost::asio' .\boost/asio/async_result.hpp(25): note: see declaration of 'boost::asio' .\boost/asio/async_result.hpp(105): error C2061: syntax error: identifier 'completion_signature' .\boost/asio/async_result.hpp(144): error C2061: syntax error: identifier 'completion_handler_for' .\boost/asio/async_result.hpp(190): note: see reference to class template instantiation 'boost::asio::async_result<CompletionToken>' being compiled .\boost/asio/async_result.hpp(144): error C2988: unrecognizable template declaration/definition .\boost/asio/async_result.hpp(144): error C2059: syntax error: ',' .\boost/asio/async_result.hpp(150): error C2334: unexpected token(s) preceding '{'; skipping apparent function body .\boost/asio/async_result.hpp(194): error C2039: 'completion_signature': is not a member of 'boost::asio' .\boost/asio/async_result.hpp(25): note: see declaration of 'boost::asio' .\boost/asio/async_result.hpp(194): error C2061: syntax error: identifier 'completion_signature' .\boost/asio/async_result.hpp(195): error C2065: 'Signature': undeclared identifier .\boost/asio/async_result.hpp(196): error C2977: 'boost::asio::async_result': too many template arguments .\boost/asio/async_result.hpp(107): note: see declaration of 'boost::asio::async_result' .\boost/asio/async_result.hpp(198): error C2913: explicit specialization; 'boost::asio::async_result' is not a specialization of a class template .\boost/asio/async_result.hpp(205): error C2039: 'completion_signature': is not a member of 'boost::asio' .\boost/asio/async_result.hpp(25): note: see declaration of 'boost::asio' .\boost/asio/async_result.hpp(205): error C2061: syntax error: identifier 'completion_signature' .\boost/asio/async_result.hpp(211): error C2065: 'Signature': undeclared identifier .\boost/asio/async_result.hpp(251): note: see reference to class template instantiation 'boost::asio::async_completion<CompletionToken>' being compiled .\boost/asio/async_result.hpp(250): error C2065: 'Signature': undeclared identifier .\boost/asio/async_result.hpp(250): error C2955: 'boost::asio::async_result': use of class template requires template argument list .\boost/asio/async_result.hpp(195): note: see declaration of 'boost::asio::async_result' .\boost/asio/async_result.hpp(258): error C2955: 'boost::asio::async_result': use of class template requires template argument list .\boost/asio/async_result.hpp(195): note: see declaration of 'boost::asio::async_result' .\boost/asio/async_result.hpp(259): note: see reference to class template instantiation 'boost::asio::detail::async_result_helper<CompletionToken,Signature>' being compiled .\boost/asio/async_result.hpp(288): error C2672: 'boost::asio::detail::async_result_initiate_memfn_helper': no matching overloaded function found .\boost/asio/async_result.hpp(292): note: see reference to class template instantiation 'boost::asio::detail::async_result_has_initiate_memfn<CompletionToken,Signature>' being compiled .\boost/asio/async_result.hpp(290): error C3206: 'boost::asio::detail::async_result_initiate_memfn_helper': invalid template argument for 'T', missing template argument list on class template 'boost::asio::async_result' .\boost/asio/async_result.hpp(281): note: see declaration of 'boost::asio::detail::async_result_initiate_memfn_helper' .\boost/asio/async_result.hpp(290): error C3206: 'boost::asio::detail::async_result_initiate_memfn_helper': invalid template argument for '<unnamed-symbol>', missing template argument list on class template 'boost::asio::async_result' .\boost/asio/async_result.hpp(278): note: see declaration of 'boost::asio::detail::async_result_initiate_memfn_helper' .\boost/asio/async_result.hpp(350): error C2039: 'completion_signature': is not a member of 'boost::asio' .\boost/asio/async_result.hpp(25): note: see declaration of 'boost::asio' .\boost/asio/async_result.hpp(350): error C2061: syntax error: identifier 'completion_signature' .\boost/asio/async_result.hpp(353): error C2065: 'Signature': undeclared identifier .\boost/asio/async_result.hpp(353): error C2923: 'boost::asio::detail::async_result_has_initiate_memfn': 'Signature' is not a valid template type argument for parameter 'Signature' .\boost/asio/async_result.hpp(354): error C2760: syntax error: unexpected token '>', expected 'expression' .\boost/asio/async_result.hpp(359): error C2065: 'Initiation': undeclared identifier .\boost/asio/async_result.hpp(359): error C2065: 'initiation': undeclared identifier .\boost/asio/async_result.hpp(360): error C2065: 'token': undeclared identifier .\boost/asio/async_result.hpp(361): error C2065: 'Args': undeclared identifier .\boost/asio/async_result.hpp(361): warning C4346: 'boost::asio::detail::async_result_has_initiate_memfn::value': dependent name is not a type .\boost/asio/async_result.hpp(361): note: prefix with 'typename' to indicate a type .\boost/asio/async_result.hpp(361): error C2988: unrecognizable template declaration/definition .\boost/asio/async_result.hpp(361): error C2059: syntax error: '...' .\boost/asio/async_result.hpp(362): error C2143: syntax error: missing ';' before '{' .\boost/asio/async_result.hpp(362): error C2447: '{': missing function header (old-style formal list?) .\boost/asio/async_result.hpp(370): error C2039: 'completion_signature': is not a member of 'boost::asio' .\boost/asio/async_result.hpp(25): note: see declaration of 'boost::asio' .\boost/asio/async_result.hpp(370): error C2061: syntax error: identifier 'completion_signature' .\boost/asio/async_result.hpp(373): error C2065: 'Signature': undeclared identifier .\boost/asio/async_result.hpp(373): error C2923: 'boost::asio::detail::async_result_has_initiate_memfn': 'Signature' is not a valid template type argument for parameter 'Signature' .\boost/asio/async_result.hpp(374): error C2065: 'Signature': undeclared identifier .\boost/asio/async_result.hpp(375): error C2065: 'Initiation': undeclared identifier .\boost/asio/async_result.hpp(375): error C2065: 'initiation': undeclared identifier .\boost/asio/async_result.hpp(376): error C2065: 'token': undeclared identifier .\boost/asio/async_result.hpp(377): error C2065: 'Args': undeclared identifier .\boost/asio/async_result.hpp(377): warning C4346: 'boost::asio::detail::async_result_has_initiate_memfn::value': dependent name is not a type .\boost/asio/async_result.hpp(377): note: prefix with 'typename' to indicate a type .\boost/asio/async_result.hpp(377): error C2988: unrecognizable template declaration/definition .\boost/asio/async_result.hpp(377): error C2059: syntax error: '...' .\boost/asio/async_result.hpp(378): error C2143: syntax error: missing ';' before '{' .\boost/asio/async_result.hpp(378): error C2447: '{': missing function header (old-style formal list?) .\boost/asio/async_result.hpp(483): error C7568: argument list missing after assumed function template 'completion_handler_for' .\boost/asio/async_result.hpp(487): note: see reference to class template instantiation 'boost::asio::detail::initiation_archetype<Signature>' being compiled .\boost/asio/async_result.hpp(484): error C2061: syntax error: identifier 'CompletionHandler' .\boost/asio/async_result.hpp(491): error C2061: syntax error: identifier 'completion_signature' .\boost/asio/async_result.hpp(492): error C2062: type 'bool' unexpected .\boost/asio/async_result.hpp(493): error C2143: syntax error: missing ';' before '{' .\boost/asio/async_result.hpp(493): error C2447: '{': missing function header (old-style formal list?) .\boost/asio/post.hpp(56): error C2039: 'completion_token_for': is not a member of 'boost::asio' .\boost/asio/post.hpp(27): note: see declaration of 'boost::asio' .\boost/asio/post.hpp(56): error C2061: syntax error: identifier 'completion_token_for' .\boost/asio/post.hpp(56): error C2988: unrecognizable template declaration/definition .\boost/asio/post.hpp(56): error C2059: syntax error: '>' .\boost/asio/post.hpp(94): error C2039: 'completion_token_for': is not a member of 'boost::asio' .\boost/asio/post.hpp(27): note: see declaration of 'boost::asio' .\boost/asio/post.hpp(94): error C2061: syntax error: identifier 'completion_token_for' .\boost/asio/post.hpp(95): error C2988: unrecognizable template declaration/definition .\boost/asio/post.hpp(95): error C2059: syntax error: '>' .\boost/asio/post.hpp(107): error C2039: 'completion_token_for': is not a member of 'boost::asio' .\boost/asio/post.hpp(27): note: see declaration of 'boost::asio' .\boost/asio/post.hpp(107): error C2061: syntax error: identifier 'completion_token_for' .\boost/asio/post.hpp(108): error C2988: unrecognizable template declaration/definition .\boost/asio/post.hpp(108): error C2059: syntax error: '>' .\boost/asio/impl/post.hpp(81): error C2039: 'completion_token_for': is not a member of 'boost::asio' .\boost/asio/impl/post.hpp(26): note: see declaration of 'boost::asio' .\boost/asio/impl/post.hpp(81): error C2061: syntax error: identifier 'completion_token_for' .\boost/asio/impl/post.hpp(81): error C2988: unrecognizable template declaration/definition .\boost/asio/impl/post.hpp(81): error C2059: syntax error: '>' .\boost/asio/impl/post.hpp(84): error C2143: syntax error: missing ';' before '{' .\boost/asio/impl/post.hpp(84): error C2447: '{': missing function header (old-style formal list?) .\boost/asio/impl/post.hpp(90): error C2039: 'completion_token_for': is not a member of 'boost::asio' .\boost/asio/impl/post.hpp(26): note: see declaration of 'boost::asio' .\boost/asio/impl/post.hpp(90): error C2061: syntax error: identifier 'completion_token_for' .\boost/asio/impl/post.hpp(90): error C2988: unrecognizable template declaration/definition .\boost/asio/impl/post.hpp(90): error C2059: syntax error: '>' .\boost/asio/impl/post.hpp(94): error C2143: syntax error: missing ';' before '{' .\boost/asio/impl/post.hpp(94): error C2447: '{': missing function header (old-style formal list?) .\boost/asio/impl/post.hpp(100): error C2039: 'completion_token_for': is not a member of 'boost::asio' .\boost/asio/impl/post.hpp(26): note: see declaration of 'boost::asio' .\boost/asio/impl/post.hpp(100): error C2061: syntax error: identifier 'completion_token_for' .\boost/asio/impl/post.hpp(100): error C2988: unrecognizable template declaration/definition .\boost/asio/impl/post.hpp(100): error C2059: syntax error: '>' .\boost/asio/impl/post.hpp(105): error C2143: syntax error: missing ';' before '{' .\boost/asio/impl/post.hpp(105): error C2447: '{': missing function header (old-style formal list?) .\boost/asio/detail/buffer_sequence_adapter.hpp(106): error C2955: 'boost::asio::detail::buffer_sequence_adapter_base': use of class template requires template argument list .\boost/asio/detail/buffer_sequence_adapter.hpp(30): note: see declaration of 'boost::asio::detail::buffer_sequence_adapter_base' .\boost/asio/detail/buffer_sequence_adapter.hpp(208): note: see reference to class template instantiation 'boost::asio::detail::buffer_sequence_adapter<Buffer,Buffers>' being compiled .\boost/asio/detail/buffer_sequence_adapter.hpp(116): error C2143: syntax error: missing ';' before '*' .\boost/asio/detail/buffer_sequence_adapter.hpp(116): fatal error C1003: error count exceeds 100; stopping compilation Has anyone else encountered the same issues and how to resolve them? It appears that the macro BOOST_ASIO_CONCEPT is the one causing the issue. This macro seems to have the value “concept bool” which causes the complaint from the compiler. Kind regards, Leo

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[Serialization] Serialize std::valarray of primitives
by Meik 23 Dec '19

23 Dec '19

Hello, I am new to C++ and thus new to Boost. My goal is to serialize a class containing multiple std::valarrays with primitives as content. The code I wrote to achieve that(minimal example to reproduce): #include <iostream> #include <boost/archive/text_oarchive.hpp> class A { valarray<int> member_one; valarray<float> member_two; friend class boost::serialization::access; template<class Archive> void serialize(Archive &ar, const unsigned int version){ ar & member_one; ar & member_two } } int main(int argc, char* argv[]) { boost::archive::text_oarchive oarchive(cout); oarchive << p; return 0; } When compiling this, the following error is given: error: class std::valarray<int> has no member names serialize I'd appreciate if you could let me know how to correctly serialize said std::valarray. Kind regards, Meik S. ||

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[asio] asio::socket -> native handle ->asio::socket not working on windows
by Klebsch, Mario 22 Dec '19

22 Dec '19

Hello, I am using boost asio in a cross platform project. The project consists of two libraries, having a C call API in between. Until now, each of those two libraries uses boost::asio internally. Each of these libraries have their own instance of boost::asio::io_service. I now need to implement a change, that requires to pass a connected socket from one library to the other one via the C call API: This is what I want to do it. * Lib1 calls new method connect() in lib2 * lib2::connect() creates a boost::asio::ip::tcp::socket * lib2::connect() connects to a service * lib2::connect() does some async communication with that service. * when the service is initialized, lib2::connect() shall pass the native handle back to its caller (Lib1). * Lib1 then creates a boost::asio::ip::tcp::socket from the native handle I have learned, that there is no way to destroy a boost::asio::ip::tcp::socket without closing the native handle. So, I have to dup() it. No problem on POSIX systems, on Windows I can use a combination of WSADuplicateSocket () and WSASocket () to achieve the same. Everything works fine on Linux, but on Windows, the parts do not work together :) The individual parts are working find. * I can use the boost::asio::ip::tcp::socket to communicate with the service. * I can use WSADuplicateSocket () and WSASocket () to get a 2nd, native handle to the socket * I can use the 2nd, native handle to communicate to the service, even after destroying the boost::asio::ip::tcp::socket instance. * I also can create a working boost::asio::ip::tcp::socket from a native socket handle, created with socket() and connected to a service with connect(). BUT: If I try to create a boost::asio::ip::tcp::socket on the socket created by the WSADuplicateSocket () and WSASocket () sequence, I get an exception. The call to CreateIoCompletionPort() in win_iocp_io_service.ipp, win_iocp_io_service::register_handle() fails with error 87 (Invalid Parameter). I have no idea, why CreateIoCompletionPort() is failing and how to avoid this. Here is a sample program demonstrating my problem. If BUG is #defined, the code fails with std::exception "assign: Falscher Parameter" (invalid parameter). #ifdef _WIN32 #include <winsock2.h> #include <ws2tcpip.h> #else #include <sys/socket.h> #endif #include <boost/asio.hpp> #define ADDR "127.0.0.1" #define PORT "7" /* echo */ #include <stdio.h> #ifndef _WIN32 inline int WSAGetLastError() { return errno; } #endif int main() { char Request[]="Hello"; char Buffer[256]; int n; try { #ifdef _WIN32 SOCKET s1 = INVALID_SOCKET; #else int s1=-1; #endif #ifdef BUG { printf("The programm does not work with this code on windows :-(\n"); boost::asio::io_service IoService; boost::asio::ip::tcp::resolver Resolver(IoService); boost::asio::ip::tcp::resolver::query Query(ADDR, PORT); boost::asio::ip::tcp::socket s(IoService); s.connect(*Resolver.resolve(Query)); printf("connected\n"); #ifdef _WIN32 WSAPROTOCOL_INFO ProtocolInfo; DWORD MyProcId = GetCurrentProcessId(); int x = WSADuplicateSocket((SOCKET)s.native_handle(), MyProcId, &ProtocolInfo); if (x) throw boost::system::error_code(WSAGetLastError(), boost::system::system_category()); s1 = WSASocket(FROM_PROTOCOL_INFO, FROM_PROTOCOL_INFO, FROM_PROTOCOL_INFO, &ProtocolInfo, 0, WSA_FLAG_OVERLAPPED); #else /* !_WIN32 */ s1=dup(s.native_handle()); #endif /* !_WIN32 */ if (s1<0) throw boost::system::error_code(WSAGetLastError(), boost::system::system_category()); } #else s1 = socket(PF_INET, SOCK_STREAM, 0); if (s1 < 0) throw boost::system::error_code(WSAGetLastError(), boost::system::system_category()); struct sockaddr_in Addr; Addr.sin_family = AF_INET; Addr.sin_port = htons(atoi(PORT)); inet_pton(AF_INET, ADDR, &Addr.sin_addr); if (connect(s1, (struct sockaddr*)&Addr, sizeof(Addr)) < 0) throw boost::system::error_code(WSAGetLastError(), boost::system::system_category()); #endif printf("s1=%d\n", s1); { boost::asio::io_service IoService; boost::asio::ip::tcp::socket s(IoService, boost::asio::ip::tcp::v4(), (boost::asio::ip::tcp::socket::native_handle_type)s1); n = s.write_some(boost::asio::buffer(&Request, sizeof(Request))); printf("write_some() returned %d\n", n); n = s.read_some(boost::asio::buffer(Buffer, sizeof(Buffer))); printf("read_some() returned %d\n", n); } return 0; } catch (boost::system::error_code &ec) { fprintf(stderr, "boost::system::error_code: %s\n", ec.message().c_str()); return -1; } catch (std::exception &e) { fprintf(stderr, "std::exception: %s\n", e.what()); return -1; } } Thanks in advance, Mario -- Mario Klebsch Actia I+ME GmbH Mario.klebsch(a)ime-actia.de<mailto:Mario.klebsch@ime-actia.de> Dresdenstrasse 17/18 Fon: +49 531 38 701 716 38124 Braunschweig Fax: +49 531 38 701 88 German

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contribution to the organization
by anshu khare 19 Dec '19

19 Dec '19

Respected sir/madam Please guide me on how to start contributing to the organization. Thank You Regards Anshu Khare

2 1

Boost public key
by David P. Riedel 17 Dec '19

17 Dec '19

Hi I'm trying to find the boost public pgp key so I can validate the release archive against its signature file. But I can't find where to import the public key from or what it is called. Thanks for any help.

3 6

Contribution to the organisation
by anshu khare 17 Dec '19

17 Dec '19

Respected Sir / Ma'am I know C++. I am new to BOOST. Please guide me on how to get started? Regards Anshu Khare

3 2