llvm dev - Jan 2013 - [LLVMdev] std::string

Are there any rules against using std::string or other parts of stl in llvm?

On Sat, Jan 19, 2013 at 5:20 PM, reed kotler <rkotler at mips.com>
wrote:
> Are there any rules against using std::string or other parts of stl in
llvm?
No. You can use any part of the stdlib.

There isn't much use of std::string in LLVM because it's simply not
needed. There's very little string manipulation, so StringRef is often
a much better choice. When there is a need for string manipulation,
the strings are generally very short, so SmallString is better.

- Michael Spencer

On Sat, Jan 19, 2013 at 8:33 PM, Michael Spencer <bigcheesegs at
gmail.com> wrote:
> There isn't much use of std::string in LLVM because it's simply not
> needed. There's very little string manipulation, so StringRef is often
> a much better choice. When there is a need for string manipulation,
> the strings are generally very short, so SmallString is better.
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.

-- Sean Silva