changed ex7_31.cpp to ex7_31.h

1. remove redundancy of include. 2. remove `class X`
sensal · Nov 17, 2014 · d2f37dc · d2f37dc
1 parent 07e23b5
commit d2f37dc
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diff --git a/ch07/ex7_31.cpp b/ch07/ex7_31.cpp
diff --git a/ch07/ex7_31.h b/ch07/ex7_31.h
@@ -0,0 +1,22 @@
+//
+//  ex7_31.h
+//  Exercise 7.31
+//
+//  Created by pezy on 11/17/14.
+//  Copyright (c) 2014 pezy. All rights reserved.
+//
+
+#ifndef Test_ex7_31_h
+#define Test_ex7_31_h
+
+class Y;
+
+class X {
+    Y* y = nullptr;
+};
+
+class Y {
+    X* x = nullptr;
+};
+
+#endif