Add IdxRange boundary slicing coverage

[psychocoderHPC]

Split from local commit 34b11403b2a4e529a55c8b7ae4dece6e1a96822f.

Base branch: pr-add-boundary-view-const-coverage.

Summary by CodeRabbit

• Bug Fixes

  • Corrected boundary range calculations for memory indexing operations to properly preserve bounds and stride values.

• Tests

  • Enhanced test coverage for const correctness of memory views and boundary slicing behavior.
  • Added verification tests ensuring boundary slicing maintains proper bounds handling and stride preservation.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: 669453b8-e139-4d72-9de9-2b13721cee13

📥 Commits

Reviewing files that changed from the base of the PR and between bd1ff5b and 5f05423.

📒 Files selected for processing (2)

• include/alpaka/mem/IdxRange.hpp
• test/unit/mem/idxRange.cpp

📝 Walkthrough

Walkthrough

The pull request modifies the initialization behavior of makeDirectionSubRange to derive subrange begin/end values from an existing range instead of zero-filled defaults, and extends test coverage with boundary view constness assertions and comprehensive boundary slicing validation.

Changes

Cohort / File(s)	Summary
Core Dimension Subrange Logic include/alpaka/mem/IdxRange.hpp	Modified makeDirectionSubRange to initialize m_begin and m_end from incoming range.m_begin and range.m_end instead of zero-filled values, changing how per-dimension boundary modifications are applied to derived subranges.
Boundary View Constness Testing test/unit/mem/constCorrectness.cpp	Added test assertions validating that boundary view subranges respect const-correctness: writable access in mutable buffers and read-only access in const/outer-const buffer views.
IdxRange Boundary Slicing Validation test/unit/mem/idxRange.cpp	Refactored vector literal formatting and introduced new test case validating boundary slicing behavior across LOWER/UPPER/MIDDLE directions, empty core scenarios, and signed coordinate ranges; verifies preservation of m_begin, m_end, m_stride, and iteration correctness.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~25 minutes

Poem

🐰 Slicing boundaries with care and precision,
From range to subrange with new decision,
Begin and end now inherit their place,
While constness assertions guard every trace.
Dimensions aligned in their proper dimension! 🎯

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The PR title clearly and accurately describes the main change: adding test coverage for IdxRange boundary slicing functionality.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch pr-add-idxrange-boundary-slicing-coverage

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[psychocoderHPC]

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🧹 Nitpick comments (1)

test/unit/mem/idxRange.cpp (1)

184-191: Optional: deduplicate collectVisited helper in this file.

This helper now appears in multiple test cases; extracting one shared local/static helper would reduce repetition.

🤖 Prompt for AI Agents

Verify each finding against the current code and only fix it if needed.

In `@test/unit/mem/idxRange.cpp` around lines 184 - 191, The collectVisited lambda
is duplicated across test cases; replace the per-test local duplicate with a
single shared helper by extracting it as a static function or a single
file-scoped lambda named collectVisited (same signature using template parameter
T_Range and Idx type deduction) and update all tests to call that shared helper;
ensure the symbol name collectVisited is used so existing call sites compile
unchanged and keep its current behavior of returning std::vector<Idx> from the
supplied range.

🤖 Prompt for all review comments with AI agents

Verify each finding against the current code and only fix it if needed.

Nitpick comments:
In `@test/unit/mem/idxRange.cpp`:
- Around line 184-191: The collectVisited lambda is duplicated across test
cases; replace the per-test local duplicate with a single shared helper by
extracting it as a static function or a single file-scoped lambda named
collectVisited (same signature using template parameter T_Range and Idx type
deduction) and update all tests to call that shared helper; ensure the symbol
name collectVisited is used so existing call sites compile unchanged and keep
its current behavior of returning std::vector<Idx> from the supplied range.

---

ℹ️ Review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: 2d03457b-d9f8-4afe-a90b-309fd2a62615

📥 Commits

Reviewing files that changed from the base of the PR and between d4a9884 and bd1ff5b.

📒 Files selected for processing (3)

• include/alpaka/mem/IdxRange.hpp
• test/unit/mem/constCorrectness.cpp
• test/unit/mem/idxRange.cpp

[psychocoderHPC]

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