std::vector<std::tuple<int32_t, std::string, std::string, std::string>> stateArray;第一位怎么塞进去,第二位怎么塞进去
时间: 2024-02-01 13:11:35 浏览: 154
在给`std::vector<std::tuple<int32_t, std::string, std::string, std::string>> stateArray`的元素赋值时,可以使用以下方法将第一位和第二位塞进去:
1. 将第一位塞进去:
```cpp
stateArray.push_back(std::make_tuple(123, "", "", ""));
```
这里使用了`std::make_tuple()`函数来创建一个包含四个元素的元组,并将其作为参数传递给`push_back()`函数。
2. 将第二位塞进去:
```cpp
std::get<1>(stateArray[0]) = "Hello";
```
这里使用了`std::get<>()`函数来访问元组中指定位置的元素,并将其赋值为字符串"Hello"。
相关问题
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:
```cpp
#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;
}
```
std::vector<std::tuple<int32_t, std::string, std::string, std::string>> pageInfo;获取第二个元素
要获取std::vector<std::tuple<int32_t, std::string, std::string, std::string>> pageInfo中的第二个元素,可以使用std::get函数和索引值1来获取。具体代码如下:
```cpp
#include <iostream>
#include <vector>
#include <tuple>
int main() {
std::vector<std::tuple<int32_t, std::string, std::string, std::string>> pageInfo; pageInfo.push_back(std::make_tuple(1, "apple", "red", "fruit"));
pageInfo.push_back(std::make_tuple(2, "banana", "yellow", "fruit"));
pageInfo.push_back(std::make_tuple(3, "orange", "orange", "fruit"));
std::string secondElement = std::get<1>(pageInfo[0]);
std::cout << "Second element: " << secondElement << std::endl;
return 0;
}
```
输出结果为:
```
Second element: apple
```
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