如何delete []“知道”操作数数组的大小？ [英] How does delete[] "know" the size of the operand array?

问题描述

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

您不会将数组的边界传递给 delete [] 。但是这些信息存储在哪里？是标准化的吗？

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

推荐答案

当你在堆上分配内存时，你的分配器会跟踪你分配了多少内存。这通常存储在head段中，就在您分配的内存之前。这样，当它是释放内存的时间，解分配器知道确切多少内存释放。

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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