This repository was archived by the owner on Feb 26, 2025. It is now read-only.
This repository was archived by the owner on Feb 26, 2025. It is now read-only.
std::variant for read function #901Open
Description
I am writing a generic H5 viewer, therefore I need to fetch data from dataset and casting the result at the end.
I tried std::vector<std::vector<std::variant<int,float,double,std::string>>> but it gives me this compilation error.
my code:
std::vector<std::vector<std::variant<int,float,double,std::string>>> data;
dataset.select({0, 0}, {10, 10}).read(data);error:
/home/username/githubs/HighFive/include/highfive/bits/../bits/H5DataType_misc.hpp: In instantiation of ‘HighFive::AtomicType<T>::AtomicType() [with T = std::variant<int, float, double, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >]’:
/home/username/githubs/HighFive/include/highfive/bits/../bits/H5DataType_misc.hpp:499:12: required from ‘HighFive::DataType HighFive::create_datatype() [with T = std::variant<int, float, double, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >]’
/home/username/githubs/HighFive/include/highfive/bits/H5ReadWrite_misc.hpp:141:84: required from ‘HighFive::details::BufferInfo<T>::BufferInfo(const HighFive::DataType&, F, Operation) [with F = HighFive::SliceTraits<HighFive::Selection>::read<std::vector<std::vector<std::variant<int, float, double, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > > >(std::vector<std::vector<std::variant<int, float, double, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >&, const HighFive::DataTransferProps&) const::<lambda()>; T = std::vector<std::vector<std::variant<int, float, double, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >]’
/home/username/githubs/HighFive/include/highfive/bits/H5Slice_traits_misc.hpp:175:34: required from ‘void HighFive::SliceTraits<Derivate>::read(T&, const HighFive::DataTransferProps&) const [with T = std::vector<std::vector<std::variant<int, float, double, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >; Derivate = HighFive::Selection; HighFive::DataTransferProps = HighFive::PropertyList<HighFive::PropertyType::DATASET_XFER>]’
/home/archiver/projects/omar_challeng/include/H5.hpp:45:81: required from here
/home/username/githubs/HighFive/include/highfive/bits/../bits/H5DataType_misc.hpp:257:57: error: static assertion failed: Type not supported
257 | static_assert(details::inspector<T>::recursive_ndim > 0, "Type not supported");
| ~~~~~~~~~~~~~~~^~~
/home/username/githubs/HighFive/include/highfive/bits/../bits/H5DataType_misc.hpp:257:57: note: the comparison reduces to ‘(0 > 0)’
In file included from /home/username/githubs/HighFive/include/highfive/bits/H5Converter_misc.hpp:13:
/home/username/githubs/HighFive/include/highfive/bits/H5Inspector_misc.hpp: In instantiation of ‘static void HighFive::details::type_helper<T>::unserialize(const hdf5_type*, const std::vector<long unsigned int>&, type&) [with T = std::variant<int, float, double, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >; hdf5_type = std::variant<int, float, double, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >; type = std::variant<int, float, double, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >]’:
/home/username/githubs/HighFive/include/highfive/bits/H5Inspector_misc.hpp:425:47: recursively required from ‘static void HighFive::details::inspector<std::vector<Size> >::unserialize(const It&, const std::vector<long unsigned int>&, type&) [with It = const std::variant<int, float, double, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >*; T = std::variant<int, float, double, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >; type = std::vector<std::variant<int, float, double, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >]’
/home/username/githubs/HighFive/include/highfive/bits/H5Inspector_misc.hpp:425:47: required from ‘static void HighFive::details::inspector<std::vector<Size> >::unserialize(const It&, const std::vector<long unsigned int>&, type&) [with It = const std::variant<int, float, double, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >*; T = std::vector<std::variant<int, float, double, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >; type = std::vector<std::vector<std::variant<int, float, double, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >]’
/home/username/githubs/HighFive/include/highfive/bits/H5Converter_misc.hpp:92:37: required from ‘void HighFive::details::DeepCopyBuffer<T>::unserialize(T&) const [with T = std::vector<std::vector<std::variant<int, float, double, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >]’
/home/username/githubs/HighFive/include/highfive/bits/H5Slice_traits_misc.hpp:199:18: required from ‘void HighFive::SliceTraits<Derivate>::read(T&, const HighFive::DataTransferProps&) const [with T = std::vector<std::vector<std::variant<int, float, double, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >; Derivate = HighFive::Selection; HighFive::DataTransferProps = HighFive::PropertyList<HighFive::PropertyType::DATASET_XFER>]’
/home/archiver/projects/omar_challeng/include/H5.hpp:45:81: required from here
/home/username/githubs/HighFive/include/highfive/bits/H5Inspector_misc.hpp:217:23: error: static assertion failed: The type is not trivially copyable
217 | static_assert(is_trivially_copyable, "The type is not trivially copyable");
| ^~~~~~~~~~~~~~~~~~~~~
/home/username/githubs/HighFive/include/highfive/bits/H5Inspector_misc.hpp:217:23: note: ‘HighFive::details::type_helper<std::variant<int, float, double, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >::is_trivially_copyable’ evaluates to false
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