使用向量<char>作为缓冲区而不在 resize() 上初始化它

I want to use vector<char> as a buffer. The interface is perfect for my needs, but there's a performance penalty when resizing it beyond its current size, since the memory is initialized. I don't need the initialization, since the data will be overwritten in any case by some third-party C functions. Is there a way or a specific allocator to avoid the initialization step? Note that I do want to use resize(), not other tricks like reserve() and capacity(), because I need size() to always represent the significative size of my "buffer" at any moment, while capacity() might be greater than its size after a resize(), so, again, I cannot rely on capacity() as a significative information for my application. Furthemore, the (new) size of the vector is never known in advance, so I cannot use std::array. If vector cannot be configured that way, I'd like to know what kind of container or allocator I could use instead of vector<char, std::alloc>. The only requirement is that the alternative to vector must at most be based on STL or Boost. I have access to C++11.

推荐答案

标准库中没有任何内容可以满足您的要求，我也不知道 boost 中的任何内容.