merge @Mooophy 's clever version

YFbookF · Sep 4, 2014 · c5b9e9e · c5b9e9e
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diff --git a/ch03/ex3_21_pezy.cpp → ch03/ex3_21.cpp b/ch03/ex3_21_pezy.cpp → ch03/ex3_21.cpp
diff --git a/docs/index.md b/docs/index.md
@@ -49,8 +49,8 @@ C++ Primer 5th Answer Note
     [3.18](https://github.com/pezy/Cpp-Primer/blob/master/ch03/ex3_18.cpp) |
     [3.19](https://github.com/pezy/Cpp-Primer/blob/master/ch03/ex3_19.cpp) |
     [3.20](https://github.com/pezy/Cpp-Primer/blob/master/ch03/ex3_20.cpp)
-    - Exercise [3.21](https://github.com/pezy/Cpp-Primer/blob/master/ch03/ex3_21_pezy.cpp) -
-    [3.21(use template)](https://github.com/pezy/Cpp-Primer/blob/master/ch03/ex3_21.cpp) |
+    - Exercise [3.21](https://github.com/pezy/Cpp-Primer/blob/master/ch03/ex3_21.cpp)(
+    [generics_version](https://github.com/pezy/Cpp-Primer/blob/master/ch03/ex3_21_generics_version.cpp)) |
     [3.22](https://github.com/pezy/Cpp-Primer/blob/master/ch03/ex3_22.cpp) |
     [3.23](https://github.com/pezy/Cpp-Primer/blob/master/ch03/ex3_23.cpp)