use C++ casting in macros

Signed-off-by: Rosen Penev <rosenp@gmail.com>

Author: neheb

ebml/EbmlElement.h

@@ -600,7 +600,7 @@ class EBML_DLL_API EbmlElement {
 
   private:
     std::size_t HeadSize() const {
-      return EBML_ID_LENGTH((const EbmlId&)*this) + CodedSizeLength(Size, SizeLength, bSizeIsFinite);
+      return EBML_ID_LENGTH(static_cast<const EbmlId&>(*this)) + CodedSizeLength(Size, SizeLength, bSizeIsFinite);
     } /// return the size of the head, on reading/writing
 
     std::uint64_t Size;        ///< the size of the data to write

src/EbmlElement.cpp

@@ -514,7 +514,7 @@ filepos_t EbmlElement::MakeRenderHead(IOCallback & output, bool bKeepPosition)
   std::array<binary, 4 + 8> FinalHead; // Class D + 64 bits coded size
   std::size_t FinalHeadSize;
 
-  FinalHeadSize = EBML_ID_LENGTH((const EbmlId&)*this);
+  FinalHeadSize = EBML_ID_LENGTH(static_cast<const EbmlId&>(*this));
   EbmlId(*this).Fill(FinalHead.data());
 
   const unsigned int CodedSize = CodedSizeLength(Size, SizeLength, bSizeIsFinite);