c++怎么使用lambda表达式进行排序_c++ lambda排序函数使用技巧

#include <algorithm>
#include <vector>
std::vector<int> nums = {5, 2, 8, 1, 9};
std::sort(nums.begin(), nums.end(), [](int a, int b) {
    return a < b;
});

struct Person {
    std::string name;
    int age;
};
<p>std::vector<Person> people = {{"Alice", 30}, {"Bob", 25}, {"Charlie", 35}};</p>
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                <p>// 按年龄升序
std::sort(people.begin(), people.end(), [](const Person& a, const Person& b) {
return a.age < b.age;
});</p><p>// 按名字字典序降序
std::sort(people.begin(), people.end(), [](const Person& a, const Person& b) {
return a.name > b.name;
});</p>

std::string sortBy = "age"; // 可动态改变
<p>std::sort(people.begin(), people.end(), [sortBy](const Person& a, const Person& b) {
if (sortBy == "name") {
return a.name < b.name;
} else {
return a.age < b.age;
}
});</p>

std::sort(people.begin(), people.end(), [](const Person& a, const Person& b) {
    return std::tie(a.age, a.name) < std::tie(b.age, b.name);
});