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A function that takes multiple non-const lvalue references as it's first N parameters is transformed into one that takes a non-const lvalue reference to a tuple when passed into a `fold` call.
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| Layer / File(s) | Summary |
|---|---|
Adapter contract, implementation, and fold integration phlex/metaprogramming/make_fold_like.hpp, phlex/core/glue.hpp, test/fold_test.cpp |
The adapter identifies leading non-const lvalue-reference parameters as accumulators, binds tuple elements by reference, and forwards input arguments. glue::fold uses the adapter. The test callable accepts separate sum and count references. |
Priority:
Estimated code review effort: 2 (Simple) | ~12 minutes
Change: Feature
Possibly related issues
- Issue 998 describes the separate-accumulator callable shape supported by this change. It also requests compatibility and additional behavior beyond the changes summarized here.
Suggested reviewers: knoepfel
Merge Risk: 
bb9b7
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The new multi-output fold adaptation does not work for member-function folds, because the bound object is dropped. Free functions and lambdas are unaffected. Fix or explicitly scope out member folds before merging.
Pre-merge checks: 
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Check name Status Explanation Resolution Docstring Coverage Docstring coverage is 20.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 5 functions across 3 files. Write docstrings for the functions missing them to satisfy the coverage threshold. -
Check name Status Explanation Description Check Check skipped - CodeRabbit’s high-level summary is enabled. Title check The title clearly and concisely describes the main change: adding an ergonomic API for folds with multiple output accumulators. Linked Issues check Check skipped because no linked issues were found for this pull request. Out of Scope Changes check Check skipped because no linked issues were found for this pull request.
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Inline comments:
Review comments at @phlex/core/glue.hpp:
- Line 81: Update the algorithm_bits call for the make_fold_like(f) adapter so
multi-output member-function pointers invoke through bound_obj_ rather than the
generic delegate path. Preserve bound_obj_ as the target object while the
adapter binds accumulator references before forwarding the call.
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phlex/core/glue.hppphlex/metaprogramming/make_fold_like.hpptest/fold_test.cpp
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Files:
test/fold_test.cppphlex/core/glue.hppphlex/metaprogramming/make_fold_like.hpp
Codecov Report✅ All modified and coverable lines are covered by tests. @@ Coverage Diff @@
## main #1006 +/- ##
==========================================
+ Coverage 88.56% 88.66% +0.09%
==========================================
Files 187 188 +1
Lines 7776 7788 +12
Branches 1012 1012
==========================================
+ Hits 6887 6905 +18
+ Misses 643 639 -4
+ Partials 246 244 -2
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A function that takes multiple non-const lvalue references as it's first N parameters is transformed into one that takes a non-const lvalue reference to a tuple when passed into a
foldcall.A possible implementation of #998.
Code
make_fold_like.hppto adapt multi-output fold callables.glue::foldto applymake_fold_likebefore constructing the fold algorithm.Tests
add_and_countto use separate non-const atomic references forsumandcount.