Qualify unqualified cout/endl in vtkPlusPolydataForce#1281
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vtkPlusPolydataForce.cxx used bare cout/endl, which relied on a transitive using-directive that newer libc++ no longer provides, so it fails to compile with "use of undeclared identifier 'cout'". Add a using directive so the file builds. Independent of ITK/VTK version.
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vtkPlusPolydataForce.cxxused barecout/endl, which no longer resolve under current libc++ (use of undeclared identifier 'cout'). Add ausingdirective so it compiles. Independent of ITK/VTK version.Details
Surfaced while building PlusLib against ITK 6 with a recent clang/libc++, but the cause is standard-library strictness, not ITK. One of a set of independent ITK-6 compatibility PRs.