http://d.puremagic.com/issues/show_bug.cgi?id=9725
Summary: std.string.format does wasteful UTF decoding
Product: D
Version: D2
Platform: All
OS/Version: All
Status: NEW
Keywords: performance
Severity: normal
Priority: P3
Component: Phobos
AssignedTo: [email protected]
ReportedBy: [email protected]
--- Comment #0 from Vladimir Panteleev <[email protected]> 2013-03-15
06:14:17 EET ---
import std.string; void main() { format("\xFF"); }
This program throws, indicating that the "format" function performs UTF-8
decoding.
This is a pointless waste of cycles. All format specifiers are in the
lower-ASCII range, and both the input and output are UTF-8. Should the format
specifier syntax require reading exactly one Unicode character, it should do so
when required, rather than reading the entire string one dchar at a time, then
encoding the results back into an UTF-8 string.
It is worth noting that writefln does not have the same issue.
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