Support std::string_view in vtkOStreamWrapper

Common/Core/vtkOStreamWrapper.cxx

@@ -81,6 +81,13 @@ vtkOStreamWrapper& vtkOStreamWrapper::operator<<(std_string const& s)
   return *this;
 }
 
+//------------------------------------------------------------------------------
+vtkOStreamWrapper& vtkOStreamWrapper::operator<<(std_string_view const& s)
+{
+  this->ostr << reinterpret_cast<std::string_view const&>(s);
+  return *this;
+}
+
 //------------------------------------------------------------------------------
 #if defined(__IBMCPP__)
 vtkOStreamWrapper& vtkOStreamWrapper::WriteInternal(const char* a)

Common/Core/vtkOStreamWrapper.h

@@ -33,6 +33,7 @@ class vtkStdString;
 class VTKCOMMONCORE_EXPORT VTK_WRAPEXCLUDE vtkOStreamWrapper
 {
   class std_string;
+  class std_string_view;
 
 public:
   ///@{
@@ -114,6 +115,13 @@ public:
     return *this;
   }
 
+  // Accept std::string_view without a declaration.
+  template <template <typename, typename> class SV>
+  vtkOStreamWrapper& operator<<(const SV<char, std::char_traits<char>>& sv)
+  {
+    return *this << reinterpret_cast<std_string_view const&>(sv);
+  }
+
   /**
    * Forward the write method to the real stream.
    */
@@ -155,6 +163,7 @@ protected:
 private:
   vtkOStreamWrapper& operator=(const vtkOStreamWrapper& r) = delete;
   vtkOStreamWrapper& operator<<(std_string const&);
+  vtkOStreamWrapper& operator<<(std_string_view const&);
 };
 
 VTK_ABI_NAMESPACE_END