[LLVMdev] std::string

Krzysztof Parzyszek kparzysz at codeaurora.org
Sat Jan 19 18:00:28 PST 2013

On 1/19/2013 7:55 PM, Sean Silva wrote:
> Although SmallString is actually pretty inefficient, since it keeps
> the string data separate from the "vector" header. I believe libc++'s
> std::string actually reuses the pointers in the "vector header" as the
> storage for the "small" size, and so in that case std::string is
> effectively a very memory efficient SmallString with storage of
> roughly 3 pointers' worth of chars.

Why do we actually have all the local versions of containers that 
already exist as a part of the C++ standard (such as SmallVector, 
DenseMap, et al.)?


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