add Chapter06

Chapter06/rvalue.cpp

@@ -0,0 +1,19 @@
+#include <cstdio>  
+
+struct my_struct { 
+
+    int a_; 
+
+    my_struct() : a_(0) {} 
+
+    my_struct(int a) : a_(a) {} 
+
+}; 
+
+int main() {  
+
+    printf("a_ = %d\r\n", my_struct().a_); 
+    printf("a_ = %d\r\n", (my_struct()=my_struct(16)).a_);  
+
+    return 0;  
+}