• Adnan (4/4) Dec 24 2019 Does the compiler automatically pass values by reference if
• Meta (7/11) Dec 25 2019 No. "in" is short for "const scope"

Adnan <contact.adnan.02 protonmail.com> writes:

Does the compiler automatically pass values by reference if 
possible with `in` parameters in higher level of optimization 
flags? I would normally use `in ref` but sometimes it's not 
compatible with different types.

Meta <jared771 gmail.com> writes:

On Wednesday, 25 December 2019 at 01:24:52 UTC, Adnan wrote:
 Does the compiler automatically pass values by reference if 
 possible with `in` parameters in higher level of optimization 
 flags? I would normally use `in ref` but sometimes it's not 
 compatible with different types.

No. "in" is short for "const scope" 
(https://dlang.org/spec/function.html#param-storage). The only 
mechanism D has for expressing "pass this argument by ref if 
possible, and by value otherwise" is "auto ref" 
(https://dlang.org/spec/function.html#auto-ref-functions), which 
requires your function to be templated.