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-rw-r--r--src/language_tag.h2
1 files changed, 2 insertions, 0 deletions
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);