Container Memory Overhead 与数据布局 | STL
本章覆盖：element payload；capacity slack；node pointers；tree metadata；bucket array；allocator metadata；padding；millions of small objects；map / unordered_map 高 overhead；flat / sorted vector alternatives；memory budget 是服务端工程真实约束。
本章知识点
- element payload
- capacity slack
- node pointers
- tree metadata
- bucket array
- allocator metadata
- padding
- millions of small objects
- map / unordered_map 高 overhead
- flat / sorted vector alternatives
- memory budget 是服务端工程真实约束