prepare for c++17

code/3/3.6.cpp

@@ -0,0 +1,36 @@
+//
+// 3.6.cpp
+// c++1x tutorial
+//
+// created by changkun at shiyanlou.com
+//
+// 完美转发
+
+#include <iostream>
+#include <utility>
+void reference(int& v) {
+    std::cout << "左值引用" << std::endl;
+}
+void reference(int&& v) {
+    std::cout << "右值引用" << std::endl;
+}
+template <typename T>
+void pass(T&& v) {
+    std::cout << "普通传参:";
+    reference(v);
+    std::cout << "std::move 传参:";
+    reference(std::move(v));
+    std::cout << "std::forward 传参:";
+    reference(std::forward<T>(v));
+    
+}
+int main() {
+    std::cout << "传递右值:" << std::endl;
+    pass(1);
+    
+    std::cout << "传递左值:" << std::endl;
+    int v = 1;
+    pass(v);
+    
+    return 0;
+}