ozo::request compilation error

[neel]

I was trying a vary basic operation. But got compilation errors.

    ozo::connection_pool_config dbconfig;
    const auto oid_map = ozo::register_types<>();
    ozo::connection_info<decltype(oid_map)> conn_info("host=localhost dbname=wee user=postgres password=123456");
    ozo::connection_pool pool(conn_info, dbconfig);
    
    ozo::rows_of<std::int64_t> rows;
    using namespace ozo::literals;
    using namespace std::chrono_literals;
    const auto query = "SELECT "_SQL + std::int64_t(1);
    ozo::request(pool[io], query, ozo::into(rows), [&](ozo::error_code ec, auto conn){
//         for(auto& row: rows) {
//             std::cout << std::get<0>(row) << std::endl;
//         }
    });

Errors

/usr/include/boost/optional/optional.hpp:350:24:   required from ‘void boost::optional_detail::optional_base<T>::assign(boost::optional_detail::optional_base<T>::rval_reference_type) [with T = ozo::connection_rep<const ozo::oid_map_t<>, ozo::none_t>; boost::optional_detail::optional_base<T>::rval_reference_type = ozo::connection_rep<const ozo::oid_map_t<>, ozo::none_t>&&]’
/usr/include/boost/optional/optional.hpp:1066:21:   required from ‘typename boost::enable_if<boost::is_same<T, typename boost::decay<T_>::type>, boost::optional<T>&>::type boost::optional<T>::operator=(T_&&) [with T_ = ozo::connection_rep<const ozo::oid_map_t<>, ozo::none_t>; T = ozo::connection_rep<const ozo::oid_map_t<>, ozo::none_t>; typename boost::enable_if<boost::is_same<T, typename boost::decay<T_>::type>, boost::optional<T>&>::type = boost::optional<ozo::connection_rep<const ozo::oid_map_t<>, ozo::none_t> >&]’
/home/neel/Projects/wee/deps/ozo/contrib/resource_pool/include/yamail/resource_pool/handle.hpp:118:31:   required from ‘void yamail::resource_pool::handle<T>::reset(yamail::resource_pool::handle<T>::value_type&&) [with T = ozo::connection_rep<const ozo::oid_map_t<>, ozo::none_t>; yamail::resource_pool::handle<T>::value_type = ozo::connection_rep<const ozo::oid_map_t<>, ozo::none_t>]’
/home/neel/Projects/wee/deps/ozo/include/ozo/impl/connection_pool.h:39:30:   required from ‘void ozo::detail::pooled_connection_wrapper<Source, Handler, TimeConstraint>::wrapper::operator()(ozo::error_code, Conn&&) [with Conn = std::shared_ptr<ozo::connection<const ozo::oid_map_t<>, ozo::none_t> >; Source = ozo::connection_info<const ozo::oid_map_t<> >; Handler = ozo::impl::async_request_op<ozo::impl::async_request_out_handler<std::back_insert_iterator<std::vector<std::tuple<long int>, std::allocator<std::tuple<long int> > > > >, ozo::query_builder<boost::hana::tuple<ozo::query_element<boost::hana::string<'S', 'E', 'L', 'E', 'C', 'T', ' '>, ozo::query_text_tag>, ozo::query_element<long int, ozo::query_param_tag> > >, ozo::none_t, main(int, char**)::<lambda(ozo::error_code, auto:54)> >; TimeConstraint = ozo::none_t; ozo::error_code = boost::system::error_code]’
/usr/include/c++/10.2.0/bits/invoke.h:60:36:   required from ‘constexpr _Res std::__invoke_impl(std::__invoke_other, _Fn&&, _Args&& ...) [with _Res = void; _Fn = ozo::detail::pooled_connection_wrapper<ozo::connection_info<const ozo::oid_map_t<> >, ozo::impl::async_request_op<ozo::impl::async_request_out_handler<std::back_insert_iterator<std::vector<std::tuple<long int>, std::allocator<std::tuple<long int> > > > >, ozo::query_builder<boost::hana::tuple<ozo::query_element<boost::hana::string<'S', 'E', 'L', 'E', 'C', 'T', ' '>, ozo::query_text_tag>, ozo::query_element<long int, ozo::query_param_tag> > >, ozo::none_t, main(int, char**)::<lambda(ozo::error_code, auto:54)> >, ozo::none_t>::wrapper; _Args = {boost::system::error_code, std::shared_ptr<ozo::connection<const ozo::oid_map_t<>, ozo::none_t> >}]’
/usr/include/c++/10.2.0/bits/invoke.h:95:40:   [ skipping 40 instantiation contexts, use -ftemplate-backtrace-limit=0 to disable ]
/home/neel/Projects/wee/deps/ozo/include/ozo/request.h:114:28:   required from ‘constexpr void ozo::detail::initiate_async_request::operator()(Handler&&, P&&, TimeConstraint, Q&&, Out) const [with Handler = main(int, char**)::<lambda(ozo::error_code, auto:54)>; P = ozo::connection_provider<ozo::connection_pool<ozo::connection_info<const ozo::oid_map_t<> >, ozo::thread_safety<true> >&>; Q = const ozo::query_builder<boost::hana::tuple<ozo::query_element<boost::hana::string<'S', 'E', 'L', 'E', 'C', 'T', ' '>, ozo::query_text_tag>, ozo::query_element<long int, ozo::query_param_tag> > >&; TimeConstraint = ozo::none_t; Out = std::back_insert_iterator<std::vector<std::tuple<long int>, std::allocator<std::tuple<long int> > > >]’
/usr/include/boost/asio/async_result.hpp:151:49:   required from ‘static boost::asio::async_result<CompletionToken, Signature>::return_type boost::asio::async_result<CompletionToken, Signature>::initiate(Initiation&&, RawCompletionToken&&, Args&& ...) [with Initiation = ozo::detail::initiate_async_request; RawCompletionToken = main(int, char**)::<lambda(ozo::error_code, auto:54)>; Args = {ozo::connection_provider<ozo::connection_pool<ozo::connection_info<const ozo::oid_map_t<>, ozo::none_t>, ozo::thread_safety<true> >&>, ozo::none_t&, const ozo::query_builder<boost::hana::tuple<ozo::query_element<boost::hana::string<'S', 'E', 'L', 'E', 'C', 'T', ' '>, ozo::query_text_tag>, ozo::query_element<long int, ozo::query_param_tag> > >&, std::back_insert_iterator<std::vector<std::tuple<long int>, std::allocator<std::tuple<long int> > > >}; CompletionToken = main(int, char**)::<lambda(ozo::error_code, auto:54)>; Signature = void(boost::system::error_code, std::shared_ptr<ozo::pooled_connection<yamail::resource_pool::handle<ozo::connection_rep<const ozo::oid_map_t<>, ozo::none_t> >, boost::asio::io_context::executor_type> >); boost::asio::async_result<CompletionToken, Signature>::return_type = void]’
/usr/include/boost/asio/async_result.hpp:364:25:   required from ‘typename std::enable_if<boost::asio::detail::async_result_has_initiate_memfn<CompletionToken, Signature>::value, decltype (boost::asio::async_result<typename std::decay<_Tp>::type, Signature>::initiate(declval<Initiation&&>(), declval<CompletionToken&&>(), (declval<Args&&>)()...))>::type boost::asio::async_initiate(Initiation&&, CompletionToken&, Args&& ...) [with CompletionToken = main(int, char**)::<lambda(ozo::error_code, auto:54)>; Signature = void(boost::system::error_code, std::shared_ptr<ozo::pooled_connection<yamail::resource_pool::handle<ozo::connection_rep<const ozo::oid_map_t<>, ozo::none_t> >, boost::asio::io_context::executor_type> >); Initiation = ozo::detail::initiate_async_request; Args = {ozo::connection_provider<ozo::connection_pool<ozo::connection_info<const ozo::oid_map_t<>, ozo::none_t>, ozo::thread_safety<true> >&>, ozo::none_t&, const ozo::query_builder<boost::hana::tuple<ozo::query_element<boost::hana::string<'S', 'E', 'L', 'E', 'C', 'T', ' '>, ozo::query_text_tag>, ozo::query_element<long int, ozo::query_param_tag> > >&, std::back_insert_iterator<std::vector<std::tuple<long int>, std::allocator<std::tuple<long int> > > >}; typename std::enable_if<boost::asio::detail::async_result_has_initiate_memfn<CompletionToken, Signature>::value, decltype (boost::asio::async_result<typename std::decay<_Tp>::type, Signature>::initiate(declval<Initiation&&>(), declval<CompletionToken&&>(), (declval<Args&&>)()...))>::type = void]’
/home/neel/Projects/wee/deps/ozo/include/ozo/request.h:94:69:   required from ‘decltype(auto) ozo::request_op<Initiator>::operator()(P&&, Q&&, TimeConstraint, Out, CompletionToken&&) const [with P = ozo::connection_provider<ozo::connection_pool<ozo::connection_info<const ozo::oid_map_t<> >, ozo::thread_safety<true> >&>; Q = const ozo::query_builder<boost::hana::tuple<ozo::query_element<boost::hana::string<'S', 'E', 'L', 'E', 'C', 'T', ' '>, ozo::query_text_tag>, ozo::query_element<long int, ozo::query_param_tag> > >&; TimeConstraint = ozo::none_t; Out = std::back_insert_iterator<std::vector<std::tuple<long int>, std::allocator<std::tuple<long int> > > >; CompletionToken = main(int, char**)::<lambda(ozo::error_code, auto:54)>; Initiator = ozo::detail::initiate_async_request]’
/home/neel/Projects/wee/deps/ozo/include/ozo/request.h:100:23:   required from ‘decltype(auto) ozo::request_op<Initiator>::operator()(P&&, Q&&, Out, CompletionToken&&) const [with P = ozo::connection_provider<ozo::connection_pool<ozo::connection_info<const ozo::oid_map_t<> >, ozo::thread_safety<true> >&>; Q = const ozo::query_builder<boost::hana::tuple<ozo::query_element<boost::hana::string<'S', 'E', 'L', 'E', 'C', 'T', ' '>, ozo::query_text_tag>, ozo::query_element<long int, ozo::query_param_tag> > >&; Out = std::back_insert_iterator<std::vector<std::tuple<long int>, std::allocator<std::tuple<long int> > > >; CompletionToken = main(int, char**)::<lambda(ozo::error_code, auto:54)>; Initiator = ozo::detail::initiate_async_request]’
/home/neel/Projects/wee/main.cpp:123:6:   required from here
/usr/include/boost/optional/optional.hpp:751:64: error: use of deleted function ‘ozo::connection_rep<const ozo::oid_map_t<>, ozo::none_t>& ozo::connection_rep<const ozo::oid_map_t<>, ozo::none_t>::operator=(ozo::connection_rep<const ozo::oid_map_t<>, ozo::none_t>&&)’
  751 |     void assign_value ( rval_reference_type val ) { get_impl() = static_cast<rval_reference_type>(val); }

[thed636]

Hi Neel! Thanks for the report! Could you please provide more information about the compiler version and flags?

[neel]

The problem appears when I use ozo::register_types<>() and then pass that to ozo::connection_info<decltype(oid_map)>. However with no parameters ozo::connection_info<> work fine. Nothing special about flags, usual cmake project.

$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /build/gcc/src/gcc/configure --prefix=/usr --libdir=/usr/lib --libexecdir=/usr/lib --mandir=/usr/share/man --infodir=/usr/share/info --with-bugurl=https://bugs.archlinux.org/ --enable-languages=c,c++,ada,fortran,go,lto,objc,obj-c++,d --with-isl --with-linker-hash-style=gnu --with-system-zlib --enable-__cxa_atexit --enable-cet=auto --enable-checking=release --enable-clocale=gnu --enable-default-pie --enable-default-ssp --enable-gnu-indirect-function --enable-gnu-unique-object --enable-install-libiberty --enable-linker-build-id --enable-lto --enable-multilib --enable-plugin --enable-shared --enable-threads=posix --disable-libssp --disable-libstdcxx-pch --disable-libunwind-exceptions --disable-werror gdc_include_dir=/usr/include/dlang/gdc
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 10.2.0 (GCC) 

[thed636]

Well, it looks like you should use ozo::connection_info<std::decay_t<decltype(oid_map)>> instead, because in your case the connection_info is specialized with const type that deletes the move c-tor for the underlying connection_rep type.

You may use class template arguments deduction for the case, wich looks much better

ozo::connection_info conn_info("host=localhost dbname=wee user=postgres password=123456", oid_map);

[thed636]

Anyway, thanks for the report. #264 should help to avoid such a situation in the future.