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-rw-r--r--src/include/functional7
1 files changed, 7 insertions, 0 deletions
diff --git a/src/include/functional b/src/include/functional
index 5ef81bf49..ac0b070f4 100644
--- a/src/include/functional
+++ b/src/include/functional
@@ -35,6 +35,13 @@ namespace std
typedef R result_type; ///< type of the return type
};
+ template<typename A, typename R>
+ struct unary_function
+ {
+ typedef A argument_type;
+ typedef R result_type;
+ };
+
/**
* less template
*/
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