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StringSink pre allocate

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When used with `readFile`, we have a pretty good heuristic of the file
size, so `reserve` this in the `string`. This will save some allocation
/ copy when the string is growing.
This commit is contained in:
Guillaume Bouchard 2020-04-29 18:44:01 +02:00
parent 7afcb5af98
commit 2e5be2a749
2 changed files with 8 additions and 4 deletions
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2
src/libutil/util.hh
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@ -162,7 +162,7 @@ MakeError(EndOfFile, Error);
/* Read a file descriptor until EOF occurs. */
string drainFD(int fd, bool block = true);
string drainFD(int fd, bool block = true, const size_t reserveSize=0);
void drainFD(int fd, Sink & sink, bool block = true);