侯捷C++内存管理3

malloc() free() C函数 不可重载
new delete C++表达式 不可重载
::operator new() ::operator delete() C++函数 可以重载
allocator:: allocate()
allocator:: deallocate()
C++标准库
可以自由设计并以之搭配任何容器

void* p1=malloc(512);//512byte
free(p1);

complex<int>* p2=new complex<int>;//object
delete p2;

void* p3= ::operator new(512);
::operator delete(p3); 

#ifdef _MSC_VER
    int* p4=allocator<int>().allocate(3,(int*)0);//3 ints
    //(int*)0无用
    allocator<int>().deallocate(p4,3);
#endif
#ifdef __BORLANDC__
    int* p4=allocator<int>().allocate(5);//5 ints
    allocator<int>().deallocate(p4,5);
#endif
#ifdef __GNUC__
    void* p4=alloc::allocate(512);//512 bytes
    alloc::deallocate(p4,512);
#endif

#ifdef __GNUC__
	void* p4=allocator<int>().allocate(7);//7 ints
	allocator<int>().deallocate((int*)p4,7);
	//pool内存池
	void* p5 = __gnu_cxx::__pool_alloc<int>().allocate(9);
	__gnu_cxx::__pool_alloc<int>().deallocate((int*)p5,9);
#endif

以上来自侯捷老师视频仅用于学习。