c++怎么实现一个对象池_c++对象池实现方法

#include <vector>
#include <cstdlib>
<p>template <typename T>
class ObjectPool {
private:
std::vector<T<em>> freeList;        // 空闲对象指针
std::vector<char</em>> memoryBlocks;  // 原始内存块</p><p>public:
ObjectPool(size_t initialSize = 10) {
growPool(initialSize);
}</p><pre class='brush:php;toolbar:false;'>~ObjectPool() {
    // 显式调用所有对象的析构并释放内存
    for (T* obj : freeList) {
        obj->~T();
    }
    for (char* block : memoryBlocks) {
        std::free(block);
    }
}

T* acquire() {
    if (freeList.empty()) {
        growPool(10);  // 池空时扩容
    }
    T* obj = freeList.back();
    freeList.pop_back();
    new(obj) T();  // placement new 构造对象
    return obj;
}

void release(T* obj) {
    obj->~T();  // 显式调用析构
    freeList.push_back(obj);
}

    for (size_t i = 0; i < count; ++i) {
        T* obj = reinterpret_cast<T*>(rawMemory + i * sizeof(T));
        freeList.push_back(obj);
    }
}

ObjectPool<MyClass> pool;
MyClass* obj = pool.acquire();
// 使用 obj...
pool.release(obj);  // 用完必须归还