在C++中,我想创建一个循环,不断检查文件的大小,并在大小更改时执行某些操作

#include<iostream>
#include<filesystem>
#include<thread>
#include<chrono>

namespace fs = std::filesystem;

void check_file_size(const fs::path& file_path, std::function<void()> on_size_change) {
    std::uintmax_t last_size = fs::file_size(file_path);
    while (true) {
        std::this_thread::sleep_for(std::chrono::seconds(1)); // 检查间隔
        std::uintmax_t current_size = fs::file_size(file_path);
        if (current_size != last_size) {
            on_size_change();
            last_size = current_size;
        }
    }
}

int main() {
    fs::path file_path = "example.txt";
    auto on_size_change = []() {
        std::cout << "文件大小发生变化"<< std::endl;
    };
    std::thread t(check_file_size, file_path, on_size_change);
    t.join();
    return 0;
}