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-rw-r--r--src/types.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/types.h b/src/types.h
index ca7603ab..46881a60 100644
--- a/src/types.h
+++ b/src/types.h
@@ -147,6 +147,7 @@ public:
extern bool operator== (Fraction const & a, Fraction const & b);
extern bool operator!= (Fraction const & a, Fraction const & b);
+extern std::ostream& operator<< (std::ostream& s, Fraction const & f);
/** @struct EqualityOptions
* @brief A class to describe what "equality" means for a particular test.