53 lines
1.1 KiB
C++
53 lines
1.1 KiB
C++
//
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// Created by light on 19-11-4.
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//
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#include <iostream>
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using namespace std;
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// 上一个例子:variadic5.cpp为递归调用
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// 当前这个例子为递归继承
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namespace light {
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template<typename...Values>
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class tuple;
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template<>
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class tuple<> {
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};
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template<typename Head, typename...Tail>
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class tuple<Head, Tail...> : private tuple<Tail...> {
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typedef tuple<Tail...> inherited;
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protected:
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Head m_head;
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public:
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tuple() {}
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tuple(Head h, Tail...tail) : m_head(h), inherited(tail...) {}
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// decltype()中的m_head必须放到前面,否则编译器找不到
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auto head() -> decltype(m_head) { return m_head; }
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// 或者 Head head() { return m_head; }
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inherited &tail() { return *this; }
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};
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}
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/**
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* string 32 8字节对齐
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* float 4
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* int 4
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* 4+4+32=40 自底向上
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*/
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int main() {
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using light::tuple;
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tuple<int, float, string> t(41, 6.3, "nico");
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cout << sizeof(t) << endl;
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cout << t.head() << endl;
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cout << t.tail().head() << endl;
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cout << t.tail().tail().head() << endl;
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return 0;
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}
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