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纯代码解析 C++内存池的简单原理及实现( 三 )

C++

【纯代码解析 C++内存池的简单原理及实现】使用示例：
#include <IOStream>#include <thread>using namespace std;class Apple {public:Apple() {id_ = 0;cout << "Apple()" << endl;}Apple(int id) {id_ = id;cout << "Apple(" << id_ << ")" << endl;}~Apple() {cout << "~Apple()" << endl;}void SetId(int id) {id_ = id;}int GetId() {return id_;}private:int id_;};void ThreadProc(ppx::base::MemoryPool<char> *mp) {int i = 0;while (i++ < 100000) {char* p0 = (char*)mp->allocate();char* p1 = (char*)mp->allocate();mp->deallocate(p0);char* p2 = (char*)mp->allocate();mp->deallocate(p1);mp->deallocate(p2);}}int main(){ppx::base::MemoryPool<char> mp;int i = 0;while (i++ < 100000) {char* p0 = (char*)mp.allocate();char* p1 = (char*)mp.allocate();mp.deallocate(p0);char* p2 = (char*)mp.allocate();mp.deallocate(p1);mp.deallocate(p2);}std::thread th0(ThreadProc, &mp);std::thread th1(ThreadProc, &mp);std::thread th2(ThreadProc, &mp);th0.join();th1.join();th2.join();Apple *apple = nullptr;{ppx::base::MemoryPool<Apple> mp2;apple = mp2.newElement(10);int a = apple->GetId();apple->SetId(10);a = apple->GetId();mp2.deleteElement(apple);}apple->SetId(12);int b = -4 % 4;int *a = nullptr;{ppx::base::MemoryPool<int, 18> mp3;a =mp3.allocate();*a = 100;//mp3.deallocate(a);int *b =mp3.allocate();*b = 200;//mp3.deallocate(b);mp3.deallocate(a);mp3.deallocate(b);int *c = mp3.allocate();*c = 300;}getchar();return 0;}



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