int id = 0;

std::string data;

Task() {

// 所有静态成员变量（无论是否 const、是否整型）都存储在程序的「静态存储区」，与全局变量、命名空间作用域的静态变量位于同一内存区域。

static int counter = 0;

id = ++counter;

std::cout << "Task #" << id << " created\n";

}

~Task() {

std::cout << "Task #" << id << " destroyed\n";

}

// 创建对象池，最多缓存 2 个对象，使用 reset_task 重置

SimpleObjectPool<Task> pool(2, reset_task);

std::cout << "\n--- 第一次获取 ---\n";

auto task1 = pool.acquire();

task1->data = "Work A";

auto task2 = pool.acquire();

task2->data = "Work B";

std::cout << "\n池中缓存数量: " << pool.cached_size() << "\n";

std::cout << "\n--- 归还对象 ---\n";

pool.release(std::move(task1)); // 归还后会 reset

pool.release(std::move(task2));

std::cout << "\n池中缓存数量: " << pool.cached_size() << "\n";

std::cout << "\n--- 第二次获取（复用）---\n";

auto task3 = pool.acquire(); // 复用 task1 或 task2

std::cout << "Reused task ID: " << task3->id << ", data: '" << task3->data << "'\n";

std::cout << "\n池中缓存数量: " << pool.cached_size() << "\n";

auto task4 = pool.acquire();

std::cout << "Reused task ID: " << task4->id << ", data: '" << task4->data << "'\n";

std::cout << "\n池中缓存数量: " << pool.cached_size() << "\n";

return 0;

}