[knoepfel]

• Code

  • Require fold operations to include at least one data product.
  • Reject accumulator-only and resource-only fold signatures at compile time.
  • Update fold registration diagnostics to report data-product, accumulator, and resource counts.
  • Track data-product counts separately from total fold arguments in fold-join templates.
  • Remove the empty-layer fallback because fold inputs are now always non-empty.
  • Use GSL contract checks and reserve repeater capacity based on the data-product count.

• Tests and build

  • Add compile-failure tests for accumulator-only and resource-only folds.
  • Add CMake support for compile-failure tests.
  • Verify that each invalid fold fails and emits the expected diagnostic.

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📥 Commits

Reviewing files that changed from the base of the PR and between a268841 and 64e1484.

📒 Files selected for processing: 7

• phlex/core/fold_join_node.hpp
• phlex/core/registration_api.hpp
• test/CMakeLists.txt
• test/compile-fail/CMakeLists.txt
• test/compile-fail/check_compile_failure.cmake
• test/compile-fail/fold_accumulator_only_test.cpp
• test/compile-fail/fold_resource_only_test.cpp

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• GitHub Check: Analyze cpp with CodeQL
• GitHub Check: build (gcc, none)
• GitHub Check: clang-tidy-check
• GitHub Check: coverage

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• test/compile-fail/check_compile_failure.cmake

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Files:

• test/compile-fail/fold_accumulator_only_test.cpp
• phlex/core/registration_api.hpp
• test/compile-fail/fold_resource_only_test.cpp
• phlex/core/fold_join_node.hpp

🔇 Additional comments: 12

phlex/core/registration_api.hpp: 2

266-267: LGTM!

297-306: LGTM!

phlex/core/fold_join_node.hpp: 5

8-8: LGTM!

39-62: LGTM!

91-101: LGTM!

115-115: LGTM!

135-150: LGTM!

test/CMakeLists.txt: 1

213-213: LGTM!

test/compile-fail/CMakeLists.txt: 1

1-23: LGTM!

test/compile-fail/check_compile_failure.cmake: 1

1-21: LGTM!

test/compile-fail/fold_accumulator_only_test.cpp: 1

1-7: LGTM!

test/compile-fail/fold_resource_only_test.cpp: 1

1-22: LGTM!

📝 Walkthrough

Fold registrations and fold-join nodes now require at least one data product. The pull request adds compile-failure tests for accumulator-only and resource-only folds and checks their expected diagnostics.

Changes: Fold product-input constraints

Layer / File(s)	Summary
Fold registration constraints phlex/core/registration_api.hpp	Fold registration now requires at least one data product and provides fold-specific input-count diagnostics that identify the accumulator, products, and resources.
Fold-join product-count and partition setup phlex/core/fold_join_node.hpp	The fold-join template rejects zero products, validates the product-layer count with GSL contract checking, and uses layers_[0] for partition index-port counting.
Compile-failure checks for productless folds test/CMakeLists.txt, test/compile-fail/*	The test build now includes compile-failure checks for accumulator-only and resource-only folds. The checks require compilation to fail and verify the expected diagnostic.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~15 minutes

Change: Bug fix

Possibly related issues

• Issue 998 proposes separate leading accumulator arguments while retaining data-product and resource arguments. This pull request adds a data-product requirement but does not implement separate accumulator arguments.

Suggested reviewers: beojan

Merge Risk: ⚪ Minimal · up to 64e14

The new product-input constraint and its tests are consistent across registration and fold-join construction. No merge-blocking issue was identified.

Pre-merge checks: 4 · 1

Failed checks: 1 warning

Check name	Status	Explanation	Resolution
Docstring Coverage		Docstring coverage is 12.50% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 8 functions across 4 files. (3 skipped: 3…	Write docstrings for the functions missing them to satisfy the coverage threshold.

Passed checks: 4 passed

Check name	Status	Explanation
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		The title clearly and concisely describes the primary change: fold operations now require at least one data product.
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.

Full details: Docstring Coverage

Explanation

Docstring coverage is 12.50% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 8 functions across 4 files. (3 skipped: 3 unsupported.)

Resolution

Write docstrings for the functions missing them to satisfy the coverage threshold.

✨ Finishing Touches: 💡 1

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

@@            Coverage Diff             @@
##             main    #1005      +/-   ##
==========================================
+ Coverage   89.16%   89.28%   +0.12%     
==========================================
  Files         176      176              
  Lines        6061     6064       +3     
  Branches     1012     1011       -1     
==========================================
+ Hits         5404     5414      +10     
+ Misses        410      407       -3     
+ Partials      247      243       -4     

Flag	Coverage Δ
amd64	89.28% <100.00%> (+0.12%)	⬆️
arm64	89.28% <100.00%> (+0.12%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
phlex/core/fold_join_node.hpp	93.61% <100.00%> (+1.78%)	⬆️
phlex/core/registration_api.hpp	100.00% <100.00%> (ø)

... and 3 files with indirect coverage changes

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