[VC9/x86] sizeof(std :: vector):20/24个字节? [英] [VC9/x86] sizeof(std::vector): 20/24 bytes?

问题描述

我注意到sizeof(std :: vector)是20(调试模式，启用迭代器调试)或24字节(调试模式，禁用迭代器调试).我想知道，如果禁用迭代器调试，为什么大小会增加?

I noticed sizeof(std::vector) is 20 (debug mode, iterator debugging enabled) or 24 bytes (debug mode, iterator debugging disabled). I'm wondering, why does the size increase if I disable iterator debugging?

为什么大小为24个字节?预计需要12个字节(3个指针)，其他8/12个字节又是做什么用的呢?标准分配器?我以为它不存储状态，所以不会使用任何内存.

Why is the size 24 bytes? 12 bytes are expected (3 pointers), what are the other 8/12 bytes used for? The standard allocator? I thought it didn't store state, so wouldn't use any memory.

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