delete[]如何“知道"?操作数数组的大小?

How does delete[] quot;knowquot; the size of the operand array?(delete[]如何“知道?操作数数组的大小?)

问题描述

Foo* set = new Foo[100];
// ...
delete [] set;

您没有将数组的边界传递给 delete[].但是这些信息存储在哪里呢?是否标准化?

You don't pass the array's boundaries to delete[]. But where is that information stored? Is it standardised?

推荐答案

当您在堆上分配内存时，您的分配器将跟踪您分配了多少内存.这通常存储在您分配的内存之前的头"段中.这样，当需要释放内存时，解除分配器就知道要释放多少内存.

When you allocate memory on the heap, your allocator will keep track of how much memory you have allocated. This is usually stored in a "head" segment just before the memory that you get allocated. That way when it's time to free the memory, the de-allocator knows exactly how much memory to free.

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