automated changes: many (pure) virtual specifiers added

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@56276 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/html/htmlfilt.h

@@ -29,12 +29,12 @@ public:
         Returns @true if this filter is capable of reading file @e file.
         Example:
     */
-    bool CanRead(const wxFSFile& file);
+    virtual bool CanRead(const wxFSFile& file) const = 0;
 
     /**
         Reads the file and returns string with HTML document.
         Example:
     */
-    wxString ReadFile(const wxFSFile& file);
+    virtual wxString ReadFile(const wxFSFile& file) const = 0;
 };
 

interface/wx/html/htmlpars.h

@@ -27,7 +27,7 @@ public:
         Returns list of supported tags. The list is in uppercase and tags
         are delimited by ','. Example : @c "I,B,FONT,P"
     */
-    virtual wxString GetSupportedTags();
+    virtual wxString GetSupportedTags() = 0;
 
     /**
         This is the core method of each handler. It is called each time
@@ -36,7 +36,7 @@ public:
         
         @return @true if ParseInner was called, @false otherwise.
     */
-    virtual bool HandleTag(const wxHtmlTag& tag);
+    virtual bool HandleTag(const wxHtmlTag& tag) = 0;
 
     /**
         This method calls parser's wxHtmlParser::DoParsing method
@@ -155,7 +155,7 @@ public:
         representation in derived parser (but it must be derived from wxObject!).
         See wxHtmlWinParser for details.
     */
-    virtual wxObject* GetProduct();
+    virtual wxObject* GetProduct() = 0;
 
     /**
         Returns pointer to the source being parsed.