no matching function for call to xt::xfile_value_reference

[hankliu5]

Hello all,

I was trying to compile the stored array example in the documentation. However, the compiler gave me the following error message.

In file included from /home/hankliu5/workspace/xtensor-example/xtensor-io-example/src/first_example.cpp:1:0:
/usr/local/include/xtensor-io/xfile_array.hpp: In instantiation of ‘xt::xfile_array_container<E, IOH>::reference xt::xfile_array_container<E, IOH>::operator()(Idxs ...) [with Idxs = {int, int}; E = xt::xarray_container<xt::uvector<long unsigned int, std::allocator<long unsigned int> >, (xt::layout_type)1, xt::svector<long unsigned int, 4ul, std::allocator<long unsigned int>, true>, xt::xtensor_expression_tag>; IOH = xt::xio_disk_handler<xt::xio_binary_config>; xt::xfile_array_container<E, IOH>::reference = xt::xfile_value_reference<long unsigned int>]’:
/home/hankliu5/workspace/xtensor-example/xtensor-io-example/src/first_example.cpp:15:12:   required from here
/usr/local/include/xtensor-io/xfile_array.hpp:539:53: error: no matching function for call to ‘xt::xfile_value_reference<long unsigned int>::xfile_value_reference(long unsigned int&, xt::xfile_dirty&)’
         return reference(m_storage(idxs...), m_dirty);
                                                     ^
In file included from /home/hankliu5/workspace/xtensor-example/xtensor-io-example/src/first_example.cpp:1:0:
/usr/local/include/xtensor-io/xfile_array.hpp:46:9: note: candidate: xt::xfile_value_reference<T>::xfile_value_reference(xt::xfile_value_reference<T>&&) [with T = long unsigned int]
         xfile_value_reference(xfile_value_reference&&) = default;
         ^
/usr/local/include/xtensor-io/xfile_array.hpp:46:9: note:   candidate expects 1 argument, 2 provided
/usr/local/include/xtensor-io/xfile_array.hpp:45:9: note: candidate: xt::xfile_value_reference<T>::xfile_value_reference(const xt::xfile_value_reference<T>&) [with T = long unsigned int]
         xfile_value_reference(const xfile_value_reference&) = default;
         ^
/usr/local/include/xtensor-io/xfile_array.hpp:45:9: note:   candidate expects 1 argument, 2 provided
/usr/local/include/xtensor-io/xfile_array.hpp:270:12: note: candidate: xt::xfile_value_reference<T>::xfile_value_reference(T&, xt::xfile_dirty&, bool&) [with T = long unsigned int]
     inline xfile_value_reference<T>::xfile_value_reference(T& value, xfile_dirty& dirty, bool& inval
            ^
/usr/local/include/xtensor-io/xfile_array.hpp:270:12: note:   candidate expects 3 arguments, 2 provided
In file included from /home/hankliu5/workspace/xtensor-example/xtensor-io-example/src/first_example.cpp:1:0:
/usr/local/include/xtensor-io/xfile_array.hpp: In instantiation of ‘xt::xfile_array_container<E, IOH>::reference xt::xfile_array_container<E, IOH>::operator()(Idxs ...) [with Idxs = {int}; E = xt::xarray_container<xt::uvector<long unsigned int, std::allocator<long unsigned int> >, (xt::layout_type)1, xt::svector<long unsigned int, 4ul, std::allocator<long unsigned int>, true>, xt::xtensor_expression_tag>; IOH = xt::xio_disk_handler<xt::xio_binary_config>; xt::xfile_array_container<E, IOH>::reference = xt::xfile_value_reference<long unsigned int>]’:
/home/hankliu5/workspace/xtensor-example/xtensor-io-example/src/first_example.cpp:35:26:   required from here
/usr/local/include/xtensor-io/xfile_array.hpp:539:53: error: no matching function for call to ‘xt::xfile_value_reference<long unsigned int>::xfile_value_reference(long unsigned int&, xt::xfile_dirty&)’
         return reference(m_storage(idxs...), m_dirty);
                                                     ^
In file included from /home/hankliu5/workspace/xtensor-example/xtensor-io-example/src/first_example.cpp:1:0:
/usr/local/include/xtensor-io/xfile_array.hpp:46:9: note: candidate: xt::xfile_value_reference<T>::xfile_value_reference(xt::xfile_value_reference<T>&&) [with T = long unsigned int]
         xfile_value_reference(xfile_value_reference&&) = default;
         ^
/usr/local/include/xtensor-io/xfile_array.hpp:46:9: note:   candidate expects 1 argument, 2 provided
/usr/local/include/xtensor-io/xfile_array.hpp:45:9: note: candidate: xt::xfile_value_reference<T>::xfile_value_reference(const xt::xfile_value_reference<T>&) [with T = long unsigned int]
         xfile_value_reference(const xfile_value_reference&) = default;
         ^
/usr/local/include/xtensor-io/xfile_array.hpp:45:9: note:   candidate expects 1 argument, 2 provided
/usr/local/include/xtensor-io/xfile_array.hpp:270:12: note: candidate: xt::xfile_value_reference<T>::xfile_value_reference(T&, xt::xfile_dirty&, bool&) [with T = long unsigned int]
     inline xfile_value_reference<T>::xfile_value_reference(T& value, xfile_dirty& dirty, bool& inval
            ^
/usr/local/include/xtensor-io/xfile_array.hpp:270:12: note:   candidate expects 3 arguments, 2 provided
CMakeFiles/first_example.dir/build.make:75: recipe for target 'CMakeFiles/first_example.dir/src/first_example.cpp.o' failed
make[2]: *** [CMakeFiles/first_example.dir/src/first_example.cpp.o] Error 1
CMakeFiles/Makefile2:110: recipe for target 'CMakeFiles/first_example.dir/all' failed
make[1]: *** [CMakeFiles/first_example.dir/all] Error 2
Makefile:90: recipe for target 'all' failed
make: *** [all] Error 2

After searching the source code, I found out that there is one additional parameter in xfile_value_reference's constructor, which doesn't appear in the stable branch.

I created a pull request (#163) that fixes the missing parameter and now I'm able to compile the example.