1 files changed, 8 insertions, 0 deletions
diff --git a/number.h b/number.h
index 337a47d..d0d2a10 100644
--- a/number.h
+++ b/number.h
@@ -35,6 +35,14 @@ public:
     std::uint32_t to_uint32() const;
 
     /**
+     * \brief Return a 64-bits-wide integer that corresponds to this number.
+     *
+     * \throws std::out_of_range The number cannot be represented by a single
+     * 64-bits-wide integer.
+     */
+    std::uint64_t to_uint64() const;
+
+    /**
      * \brief Return true if this number is not equal to 0. Otherwise, return
      * false.
      */