44 lines
1003 B
C++
44 lines
1003 B
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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#include <tuple>
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#include <bitset>
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using namespace std;
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// tuple递归调用
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// 得出这种打印[7,5....,42]
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// 需要知道有几个以及现在操作的是第几个 sizeof...()
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// cout<< make_tuple(7.5,string("hello"),bitset<16>(377),47);
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template<int IDX, int MAX, typename... Args>
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struct print_tuple {
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static void print(ostream &os, const tuple<Args...> &t) {
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os << get<IDX>(t) << (IDX + 1 == MAX ? "" : ",");
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print_tuple<IDX + 1, MAX, Args...>::print(os, t);
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}
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};
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// 偏特化
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template<int MAX, typename... Args>
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struct print_tuple<MAX, MAX, Args...> {
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static void print(ostream &os, const tuple<Args...> &t) {
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}
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};
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template<typename ... Args>
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ostream &operator<<(ostream &os, const tuple<Args...> &t) {
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os << "[";
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print_tuple<0, sizeof...(Args), Args...>::print(os, t);
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return os << "]";
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}
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int main() {
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cout << make_tuple(7.5, string("hello"), bitset<16>(377), 47) << endl;
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} |