revision #2: 检阅部分模板相关内容

code/2/2.13.alias.template.cpp

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+//
+// 2.13.alias.template.cpp
+// chapter 2 language usability
+// modern cpp tutorial
+//
+// created by changkun at changkun.de
+//
+
+#include <iostream>
+#include <vector>
+#include <string>
+
+template<typename T, typename U>
+class MagicType {
+public:
+    T dark;
+    U magic;
+};
+
+// illegal
+// template<typename T>
+// typedef MagicType<std::vector<T>, std::string> FakeDarkMagic;
+
+typedef int (*process)(void *);
+using NewProcess = int(*)(void *);
+template<typename T>
+using TrueDarkMagic = MagicType<std::vector<T>, std::string>;
+
+int main() {
+    // FakeDarkMagic<bool> me;
+    TrueDarkMagic<bool> you;
+}