我在Objective-C中对内存分配进行了很多研究,并且阅读了很多有关此内容的文章和博客,但我仍然有一些不清楚的时刻。我知道对象类型存储在堆中,原始类型存储在堆栈中,但是请您向我解释一下所列示例的更多信息:
NSObject *obj;
NSLog(@"%p", obj); //prints 0x0 which means address in stack ?
NSLog(@"%p", &obj); //prints 0x7ffee427bf68 which means address in heap ?
obj = [[NSObject alloc] init];
NSLog(@"%p", obj); //prints 0x6000000119b0 which means address in stack ?
NSLog(@"%p", &obj); //prints 0x7ffee427bf68 which means address in heap ?
与原始类型相同:
int value = 23;
NSLog(@"%p", value); //prints 0x17 - is that a stack address ?
NSLog(@"%p", &value); //prints 0x7ffeea19bf6c - is that a stack address too ?
无论是局部变量还是块变量,都将存储在堆栈内存中,即使它是指针,但是如果您使用指针存储地址,并且该地址来自动态内存,则该地址比动态内存要大,例如:
Func()
{
int *a ;
int b; --stack memory
a = malloc (sizeof(int));
Printf &a;-----this will be stack memory pointer and will be store in stack memory.
Print a;-----this will point to address which is allocate by heap this will be store in heap memory.
}
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