2 files changed, 16 insertions, 0 deletions
diff --git a/src/language_tag.cc b/src/language_tag.cc
index 6c7e6da9..5e2c5a8b 100644
--- a/src/language_tag.cc
+++ b/src/language_tag.cc
@@ -366,6 +366,20 @@ dcp::operator== (dcp::LanguageTag const& a, dcp::LanguageTag const& b)
 }
 
 
+bool
+dcp::operator!= (dcp::LanguageTag const& a, dcp::LanguageTag const& b)
+{
+	return a.to_string() != b.to_string();
+}
+
+
+bool
+dcp::operator< (dcp::LanguageTag const& a, dcp::LanguageTag const& b)
+{
+	return a.to_string() < b.to_string();
+}
+
+
 ostream&
 dcp::operator<< (ostream& os, dcp::LanguageTag const& tag)
 {
diff --git a/src/language_tag.h b/src/language_tag.h
index 1716a8db..d18572e4 100644
--- a/src/language_tag.h
+++ b/src/language_tag.h
@@ -240,6 +240,8 @@ private:
 
 
 extern bool operator==(dcp::LanguageTag const& a, dcp::LanguageTag const& b);
+extern bool operator!=(dcp::LanguageTag const& a, dcp::LanguageTag const& b);
+extern bool operator<(dcp::LanguageTag const& a, dcp::LanguageTag const& b);
 extern std::ostream& operator<<(std::ostream& os, dcp::LanguageTag const& tag);