On Friday, 8 December 2017 at 15:40:08 UTC, Steven Schveighoffer
wrote:
On 12/7/17 8:11 PM, Mengu wrote:
On Thursday, 7 December 2017 at 22:39:44 UTC, Daniel Kozak
wrote:
The other slowdown is caused by concatenation. Because
std::string += is more simillar to std.array.(Ref)Appender
wait, i thought appenders performed better than concatenation.
is that not true or did i just misunderstand your post?
You misunderstood. Appender is faster than ~= to a straight
array, because it doesn't have to do any opaque lookups in the
GC to see if it needs to reallocate -- all the information is
right there.
Daniel's point was that Appender is more akin to std::string
(which doesn't have the benefit of having language-defined
array operaions). If the blogger used Appender, he would have
had better performance.
-Steve
thanks for the explanation steve.
