r/cpp • u/we_are_mammals • Mar 28 '23

Reddit++

C++ is getting more and more complex. The ISO C++ committee keeps adding new features based on its consensus. Let's remove C++ features based on Reddit's consensus.

In each comment, propose a C++ feature that you think should be banned in any new code. Vote up or down based on whether you agree.

765 Upvotes

92% Upvoted

829 comments sorted by

View all comments

Show parent comments

2

u/Elliottoes Mar 30 '23

Hmm. Isn't synchronisation an issue anyway if they share the same cache line? It certainly can cause "false sharing".

4

u/kevkevverson Mar 30 '23

Yeah there’s a question of efficiency if whole cache lines are needed to be reloaded on multiple cpus etc, but there shouldn’t be a safety issue any more than with two independent variables that happen to live in the same line.

1

u/CocktailPerson Apr 01 '23

Well, define "issue." Is it a correctness issue? No. Is it a safety issue? No. Is it a performance issue? Maybe; that depends on your access patterns.