+#if FASTTAGKEY
+typedef union {
+ uint16_t tab[2];
+ uint32_t tagkey;
+ } TagKey;
+/* ostream operator for TagKey */
+inline std::ostream& operator<<(std::ostream& _O, TagKey _val)
+{
+ _O.setf( std::ios::right);
+ return (_O << std::hex << std::setw( 4 ) << std::setfill( '0' )
+ << _val.tab[0] << '|' << std::setw( 4 ) << std::setfill( '0' )
+ << _val.tab[1] << std::setfill( ' ' ) << std::dec);
+};
+inline bool operator==(TagKey _self, TagKey _val)
+{
+ return _self.tagkey == _val.tagkey;
+};
+inline bool operator<(TagKey _self, TagKey _val)
+{
+ // This expression is a tad faster but PrintFile output
+ // is more difficult to read
+ //return _self.tagkey < _val.tagkey;
+
+ // More usal order of dicom tags:
+ if( _self.tab[0] == _val.tab[0] )
+ return _self.tab[1] < _val.tab[1];
+ return _self.tab[0] < _val.tab[0];
+};
+#else
+typedef std::string TagKey;
+#endif
+#if defined(_MSC_VER) && (_MSC_VER == 1200)
+// Doing everything within gdcm namespace to avoid polluting 3d party software
+inline std::ostream& operator<<(std::ostream& _O, std::string _val)
+{
+ return _O << _val.c_str();
+};
+#endif