[IM]: C++14

04.c++14/01.数字分隔符.cpp

@@ -0,0 +1,13 @@
+#include <iostream>
+#include <chrono>
+using namespace std;
+
+int main()
+{
+	auto a = 1'234'567; // 1234567 整数
+	auto b = 1'234'56s; // 1234567秒 // std::chrono::milliseconds
+
+	cout << a << endl;
+	cout << b.count() << endl;
+	return 0;
+}

04.c++14/02.函数返回值类型推导.cpp

@@ -0,0 +1,14 @@
+#include <iostream>
+using namespace std;
+
+template<typename T>
+auto func(T i)
+{
+	return i;
+}
+
+int main()
+{
+	cout << func("C++14") << endl;
+	return 0;
+}

04.c++14/03.auto.cpp

@@ -0,0 +1,10 @@
+#include <iostream>
+using namespace std;
+
+int main() {
+
+	auto f = [](auto a) { return a; };
+
+	cout << f("c++14") << endl;
+	return 0;
+}

04.c++14/04.变量模版.cpp

@@ -0,0 +1,29 @@
+#include <iostream>
+using namespace std;
+
+template<class T>
+constexpr T pi = T(3.1415926535897932385L);
+
+template<typename T, typename U>
+struct A {
+   T t;
+   U u;
+};
+
+template<typename T>
+using B = A<T, int>;
+
+int main() {
+
+	cout << pi<int> << endl; // 3
+	cout << pi<double> << endl; // 3.14159
+
+
+	B<double> b;
+	b.t = 10;
+	b.u = 20;
+	cout << b.t << endl;
+	cout << b.u << endl;
+
+	return 0;
+}

04.c++14/05.constexpr.cpp

@@ -0,0 +1,8 @@
+#include <iostream>
+using namespace std;
+
+int main() {
+
+	cout << "hello, world!" << endl;
+	return 0;
+}