std::vector<std::tuple<int32_t, std::string, std::string, std::string>> routerState;取出第一个元素

你可以使用`std::get`函数来取出`std::vector<std::tuple<int32_t, std::string, std::string, std::string>>`中的第一个元素。下面是示例代码：

#include <iostream>
#include <vector>
#include <tuple>

int main() {
    std::vector<std::tuple<int32_t, std::string, std::string, std::string>> routerState;
    
    // 添加一些元素到routerState
    routerState.push_back(std::make_tuple(1, "A", "B", "C"));
    routerState.push_back(std::make_tuple(2, "D", "E", "F"));
    routerState.push_back(std::make_tuple(3, "G", "H", "I"));
    
    // 取出第一个元素
    auto firstElement = std::get<0>(routerState[0]);
    
    std::cout << "First element: " << firstElement << std::endl; // 输出：First element: 1
    
    return 0;
}