On 7 December 2017 at 23:39, Daniel Kozak <kozz...@gmail.com> wrote: > The other slowdown is caused by concatenation. Because std::string += is > more simillar to std.array.(Ref)Appender >
Correct. The semantics of ~= mean that the memory is copied around to a new allocation every time (unless the array is marked assumeSafeAppend).
