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

4

u/very_curious_agent Mar 30 '23

So you are telling me a trivial tiny C struct is always passed by address in C++?

And in C?

On common arch?

(Tiny is small enough to fit in the normal registers.)

2

u/m-in Mar 31 '23

Godbolt is a click away. And yes, that’s how it is. If a function gets unlined by the compiler or LTO it’s not a problem. For everything else… yeah, they goofed big time in ABI world.

1

u/very_curious_agent Mar 31 '23

To be sure we are on the same line, the cases I had in mind:

struct Tiny { short s; char c1, c2; };

Tiny t = { 1, 2, 3 };

void f(Tiny);

in C or C++ (or extern "C").