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This PR fixes a bug in XrdCl::TaskWrapper template specialization which disallows creation of std::packaged_tasks for operations which do not require arguments.

Steps to reproduce

Add the following code to the tests/XrdClTests/OperationsWorkflowTest.cc file:

void WorkflowTest::MkDirAsyncTest() {
  using namespace XrdCl;

  FileSystem fs{"/"};

  std::packaged_task<void(XrdCl::XRootDStatus & st)> mkdirTask{
    [](XrdCl::XRootDStatus &st) {
        if (!st.IsOK())
          throw XrdCl::PipelineException(st);
    }};

  auto &&t = Async(MkDir(fs, "MkDirAsyncTest", XrdCl::MkDirFlags::None,
            XrdCl::Access::Mode::UR | XrdCl::Access::Mode::UW |
                XrdCl::Access::Mode::UX | XrdCl::Access::Mode::GR |
                XrdCl::Access::Mode::GW | XrdCl::Access::Mode::GX) >> mkdirTask);

  CPPUNIT_ASSERT(t.get().status == stOK);
}

Compilation of this test fails with:

[ 93%] Building CXX object tests/XrdClTests/CMakeFiles/XrdClTests.dir/OperationsWorkflowTest.cc.o
[ 94%] Built target xrdfs
[ 95%] Built target XrdClTestMonitor-5
In file included from /mnt/docker/onedata/VFS-6474-add-xrootd/xrootd/src/XrdCl/XrdClOperations.hh:35,
                 from /mnt/docker/onedata/VFS-6474-add-xrootd/xrootd/tests/XrdClTests/OperationsWorkflowTest.cc:30:
/mnt/docker/onedata/VFS-6474-add-xrootd/xrootd/src/XrdCl/XrdClOperationHandlers.hh: In instantiation of ‘static XrdCl::ResponseHandler* XrdCl::Resp<void>::Create(std::packaged_task<Return(XrdCl::XRootDStatus&)>&) [with Return = void]’:
/mnt/docker/onedata/VFS-6474-add-xrootd/xrootd/src/XrdCl/XrdClOperations.hh:518:53:   required from ‘Derived<true> XrdCl::ConcreteOperation<Derived, HasHndl, HdlrFactory, Args>::operator>>(Hdlr&&) [with Hdlr = std::packaged_task<void(XrdCl::XRootDStatus&)>&; Derived = XrdCl::MkDirImpl; bool HasHndl = false; HdlrFactory = XrdCl::Resp<void>; Args = {XrdCl::Arg<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, XrdCl::Arg<XrdCl::MkDirFlags::Flags>, XrdCl::Arg<XrdCl::Access::Mode>}]’
/mnt/docker/onedata/VFS-6474-add-xrootd/xrootd/tests/XrdClTests/OperationsWorkflowTest.cc:896:71:   required from here
/mnt/docker/onedata/VFS-6474-add-xrootd/xrootd/src/XrdCl/XrdClOperationHandlers.hh:708:30: error: cannot convert ‘XrdCl::TaskWrapper<void, void>*’ to ‘XrdCl::ResponseHandler*’
  708 |         return make_finalized( new TaskWrapper<void, Return>( std::move( task ) ) );
      |                ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      |                              |
      |                              XrdCl::TaskWrapper<void, void>*
/mnt/docker/onedata/VFS-6474-add-xrootd/xrootd/src/XrdCl/XrdClOperationHandlers.hh:591:60: note:   initializing argument 1 of ‘XrdCl::FinalizeHandler* XrdCl::make_finalized(XrdCl::ResponseHandler*)’
  591 |   inline FinalizeHandler* make_finalized( ResponseHandler *handler )
      |                                           ~~~~~~~~~~~~~~~~~^~~~~~~
make[2]: *** [tests/XrdClTests/CMakeFiles/XrdClTests.dir/build.make:193: tests/XrdClTests/CMakeFiles/XrdClTests.dir/OperationsWorkflowTest.cc.o] Error 1
make[1]: *** [CMakeFiles/Makefile2:1126: tests/XrdClTests/CMakeFiles/XrdClTests.dir/all] Error 2
make: *** [Makefile:141: all] Error 2

The PR contains the above mentioned test which compiles fine with the fix (I do not know if it actually passes...)

You can view, comment on, or merge this pull request online at:

  https://github.com/xrootd/xrootd/pull/1232

Commit Summary

File Changes

Patch Links:

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