see #2: move non-type template param auto to ch02

code/2/todo/2.6.cpp

@@ -1,76 +0,0 @@
-//
-// 2.6.cpp
-// modern c++ tutorial
-//
-// created by changkun at changkun.de
-//
-// 模板增强
-
-
-#include <iostream>
-#include <vector>
-#include <string>
-
-template class std::vector<bool>;            // 强行实例化
-extern template class std::vector<double>;   // 不在该编译文件中实例化模板
-
-
-template< typename T, typename U, int value>
-class SuckType {
-public:
-    T a;
-    U b;
-    SuckType():a(value),b(value){}
-};
-// template< typename T>
-// typedef SuckType<std::vector<int>, T, 1> NewType; // 不合法
-
-template <typename T>
-using NewType = SuckType<int, T, 1>;                 // 合法
-
-// 默认模板类型
-template<typename T = int, typename U = int>
-auto add(T x, U y) -> decltype(x+y) {
-    return x+y;
-}
-
-// sizeof...
-template<typename... Args>
-void magic(Args... args) {
-    std::cout << sizeof...(args) << std::endl;
-}
-
-
-// 1. 递归解参数包
-template<typename T>
-void printf1(T value) {
-    std::cout << value << std::endl;
-}
-template<typename T, typename... Args>
-void printf1(T value, Args... args) {
-    std::cout << value << std::endl;
-    printf1(args...);
-}
-// 2.初始化列表展开解参数包
-template<typename T, typename... Args>
-auto printf2(T value, Args... args) {
-    std::cout << value << std::endl;
-    return std::initializer_list<T>{([&] {
-        std::cout << args << std::endl;
-    }(), value)...};
-}
-
-int main() {
-    
-    std::vector<std::vector<int>> wow;      // 注意尖括号
-    
-    NewType<int> t;
-    
-    magic();
-    magic(1);
-    magic(1,"");
-    
-    printf1(1, 2.3, "abc");
-    printf2(1, 2.3, "abc");
-    return 0;
-}

code/2/todo/2.xxx.cpp

@@ -1,21 +0,0 @@
-#include <iostream>
-
-template<typename T0>
-void printf(T0 value) {
-    std::cout << value << std::endl;
-}
-template<typename T, typename... Args>
-void printf(T value, Args... args) {
-    std::cout << value << std::endl;
-    printf(args...);
-}
-
-template<typename T0, typename... T>
-void printf_short(T0 t0, T... t) {
-    std::cout << t0 << std::endl;
-    if constexpr (sizeof...(t) > 0) printf(t...);
-}
-int main() {
-    printf_short(1, 2, "123", 1.1);
-    return 0;
-}

code/2/todo/fold.expression.cpp

@@ -1,8 +0,0 @@
-#include <iostream>
-template<typename ... T>
-auto sum(T ... t) {
-    return (t + ...);
-}
-int main() {
-    std::cout << sum(1, 2, 3, 4, 5, 6, 7, 8, 9, 10) << std::endl;
-}