Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom

add ref-return-scope table #3607

Open
wants to merge 4 commits into
base: master
Choose a base branch
from
Open

add ref-return-scope table #3607

Changes from 3 commits
Commits
Show all changes
4 commits
Select commit Hold shift + click to select a range
095f897
add ref-return-scope table
WalterBright May 17, 2023
d405df2
add article on ref, return, and scope annotations
WalterBright May 19, 2023
46753fc
Update spec/function.dd
RazvanN7 May 19, 2023
1fa0705
Update spec/function.dd
PetarKirov May 19, 2023
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
28 changes: 25 additions & 3 deletions spec/function.dd
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -1905,9 +1905,27 @@ $(H3 $(LNAME2 ref-return-scope-parameters, Ref Return Scope Parameters))
When a parameter is passed by `ref` and has both the `return` and `scope` storage classes,
it gets $(LINK2 #return-scope-parameters, `return scope`) semantics if and only if the `return` and `scope`
keywords appear adjacent to each other, in that order.
Specifying a `return ref` and `scope` parameter enables returning a reference to a scope pointer.
In all other cases, the parameter has $(LINK2 #return-ref-parameters, `return ref`) semantics
and regular $(LINK2 #scope-parameters, `scope`) semantics.)
This behavior is summarized as follows:)

$(TABLE2 Combinations of `ref` $(COMMA) `return` and `scope`,
$(THEAD Order, Interpretation)
$(TROW `ref`, $(REFP))
$(TROW `return`, $(RETURN_SCOPE))
$(TROW `scope`, $(SCOPE))
$(TROW `return ref` and `ref return`, $(RETURN_REF))
$(TROW `return scope` and `scope return`, $(RETURN_SCOPE))
$(TROW `ref scope` and `scope ref`, $(REFP) and $(SCOPE))
$(TROW `ref return scope` and `return scope ref`, $(REFP) and $(RETURN_SCOPE))
$(TROW `ref scope return`$(COMMA) `return ref scope`$(COMMA)
`scope return ref`$(COMMA) and `scope ref return`, $(RETURN_REF) and $(SCOPE))

)

$(BEST_PRACTICE do not use `ref return` and `scope return`.)

$(P Specifying a `return ref` and `scope` parameter enables returning a reference to a scope pointer.
In all other cases, the parameter has $(RETURN_REF) semantics
and regular $(SCOPE) semantics.)

---
U xerxes( ref return scope V v) // (1) ref and return scope
Expand Down Expand Up @@ -4230,3 +4248,7 @@ Macros:
TITLE=Functions
ASSIGNEXPRESSION=$(GLINK2 expression, AssignExpression)
CHECK=✔
REFP=$(LINK2 #ref-params, `ref`)
RETURN_REF=$(LINK2 #return-ref-parameters, `return ref`)
SCOPE=$(LINK2 #scope-parameters, `scope`)
RETURN_SCOPE=$(LINK2 #return-scope-parameters, `return scope`)
PetarKirov marked this conversation as resolved.
Show resolved Hide resolved