迭代器求一个结构体类型vector中结构体的double元素每个数之间的统一间隔

可以使用迭代器遍历vector中的结构体，然后计算每个结构体的double元素与前一个结构体的double元素之间的差值，从而得到统一间隔。以下是示例代码：

#include <iostream>
#include <vector>

struct MyStruct {
    int id;
    double value;
};

int main() {
    std::vector<MyStruct> vec{ {1, 1.0}, {2, 2.5}, {3, 4.0}, {4, 6.5}, {5, 9.0} };

    auto it = vec.begin();
    double prev_value = it->value;
    ++it;
    while (it != vec.end()) {
        double diff = it->value - prev_value;
        std::cout << "Difference between " << it->id << " and " << (it - 1)->id << ": " << diff << std::endl;
        prev_value = it->value;
        ++it;
    }

    return 0;
}

输出结果为：

Difference between 2 and 1: 1.5
Difference between 3 and 2: 1.5
Difference between 4 and 3: 2.5
Difference between 5 and 4: 2.5