Earle F. Philhower, III 1aeea124b3 Speed up empty String creation slightly (#6573) ...

As @dirkmuller found out in #6568, there is a difference in code
executed between `String str(nullptr)` and `String str("")`, but in the
end the actual object is identical.  It's a few bytes of code, but every
little bit counts.

Update the default `String()` constructor to use `nullptr` and not `""`.
This will remove a constant literal load and the execution of the
String::copy method and strlen().

2019-10-01 02:35:23 -03:00

..

esp8266

Speed up empty String creation slightly (#6573)

2019-10-01 02:35:23 -03:00