see #2: add std::initializer_list for printf back

code/2/2.15.variadic.template.param.cpp

@@ -17,7 +17,7 @@ void magic(Ts... args) {
 }
 
 
-// 1 recursive parameter unpack
+// 1. recursive parameter unpack
 template<typename T0>
 void printf1(T0 value) {
     std::cout << value << std::endl;
@@ -28,13 +28,22 @@ void printf1(T value, Ts... args) {
     printf1(args...);
 }
 
-// 2 variadic template parameter unfold
+// 2. variadic template parameter unfold
 template<typename T0, typename... T>
 void printf2(T0 t0, T... t) {
     std::cout << t0 << std::endl;
     if constexpr (sizeof...(t) > 0) printf2(t...);
 }
 
+// 3. parameter unpack using initializer_list
+template<typename T, typename... Ts>
+auto printf3(T value, Ts... args) {
+    std::cout << value << std::endl;
+    (void) std::initializer_list<T>{([&args] {
+        std::cout << args << std::endl;
+    }(), value)...};
+}
+
 int main() {
     magic();
     magic(1);
@@ -42,5 +51,6 @@ int main() {
     
     printf1(1, 2, "123", 1.1);
     printf2(1, 2.3, "abc");
+    printf3(111, 123, "alpha", 1.2);
     return 0;
 }