commit 51b0651ed5d92204a2374309c0f318788212b8b2
Author: Daniel Swanson <popcorn.tomato.dude@gmail.com>
Date:   Thu Jun 10 12:39:44 2021 -0500

    add << UChar for newer g++ and switch << back to std::ostream

diff --git a/lttoolbox/ustring.h b/lttoolbox/ustring.h
index 459fcfa..fd7ea13 100644
--- a/lttoolbox/ustring.h
+++ b/lttoolbox/ustring.h
@@ -40,8 +40,15 @@ UString to_ustring(const char* str);
 // append UTF-16 string to UTF-32 vector of symbols
 void ustring_to_vec32(const UString& str, std::vector<int32_t>& vec);
 
-inline std::basic_ostream<char>&
-operator<<(std::basic_ostream<char>& ostr, const UString& str)
+inline std::ostream&
+operator<<(std::ostream& ostr, UChar c)
+{
+  ostr << std::hex << static_cast<uint16_t>(c);
+  return ostr;
+}
+
+inline std::ostream&
+operator<<(std::ostream& ostr, const UString& str)
 {
   std::string res;
   utf8::utf16to8(str.begin(), str.end(), std::back_inserter(res));