有没有办法得到deque的内部存储大小为vector :: capacity？ [英] Is there a way to get deque's internal storage size as vector::capacity?

问题描述

我明白deque和vector都有一定的增长空间。 vector :: capacity（）能够获得向量的内部保留空间。 Deque在标准中没有这样的成员。有没有办法获得这些信息？

I understand that both deque and vector reserve some space for growth. vector::capacity() is able to get the internal reserved space for a vector. Deque doesn't have such a member in the standard. Is there some way to get this information?

推荐答案

你必须深入到实现中去。 gcc 4.1.1附带的 std :: deque 的版本似乎以512字节的块分配内存。但是，只要我在15分钟后盯着所有的下划线和C风格的演员到 size_t 。然后我遇到了这个评论：

You'd have to dig into the implementation to figure that out. The version of std::deque that comes with gcc 4.1.1 appears to allocate memory in 512 byte chunks. But that's as far as I got after 15 minutes of staring at all the underscores and C-style casts to size_t. And then I came across this comment:

初始底层内存布局有点复杂...

The initial underlying memory layout is a bit complicated...

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