一个简单内存池的实现

#include <iostream.h> #include <time.h> #include "MemoryPool.h" class CMyClass { public: CMyClass() { mm = 0; pp = 0; } ~CMyClass() { } static void* operator new(size_t size) { if(size != sizeof(CMyClass)) return ::operator new(size); return CMyClass::m_pool.req_from_pool(); } static void operator delete(void *obj) { CMyClass::m_pool.release_obj((CMyClass*) obj); } private: static CMemoryPool<CMyClass> m_pool; public: int mm; int pp; }; const size_t LOOPS = 10000000; CMemoryPool<CMyClass> CMyClass::m_pool(10000000); int main() { clock_t t; CMyClass *cc; t = clock(); for (size_t i = 0; i < LOOPS; ++i) { cc = ::new CMyClass(); } cout << (clock() - t) * 1.0 / CLOCKS_PER_SEC << endl; t = clock(); for (size_t st = 0; st<LOOPS;st++) { cc = new CMyClass(); } cout << (clock() - t) * 1.0 / CLOCKS_PER_SEC << endl; /////////////////////////标准类型的用法 CMemoryPool<double> d_Pool(10); double *p[10]; int j; cout<<"start to new mem for elements"<<endl; for(j=0; j<10; ++j) { p[j] = d_Pool.req_from_pool(); cout<<"element:"<<j<<" addr:"<< p[j]<<std::endl; } cout<<"start to delete elements"<<endl; for(j=0; j<5; ++j) { d_Pool.release_obj(p[j]); cout<<"element:"<<j<<" addr:"<< p[j]<<std::endl; } cout<<"start to new mem for elements"<<endl; for(j=0; j<5; ++j) { p[j] = d_Pool.req_from_pool(); cout<<"element:"<<j<<" addr:"<< p[j]<<std::endl; } return 0; }