Add BoundedInt<TBounds> with custom-bounds witness pattern (closes #59) - #79
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Add BoundedInt<TBounds> with custom-bounds witness pattern (closes #59)#79KaliCZ wants to merge 4 commits into
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CoverageLines: 3923 / 5326 (73.7%) Branches: 2072 / 2800 (74.0%) Files changed in this PR
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codecov-commenter
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Apr 26, 2026
Codecov Report❌ Patch coverage is
@@ Coverage Diff @@## main #79 +/- ##
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+ Coverage 89.07% 89.10% +0.02%
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Files 85 86 +1 Lines 1877 1890 +13 Branches 408 409 +1 ==========================================
+ Hits 1672 1684 +12 - Misses 134 135 +1
Partials 71 71
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Introduces an int constrained to [TBounds.Min, TBounds.Max] via a small witness type implementing IBounds<int>. Bounds travel with the type, so e.g. `BoundedInt<PageSizeBounds>` makes the 1..100 invariant part of the signature. Also opens up the JSON converter factory to any struct marked with [NumericWrapper], so users can spin up their own validated numeric wrappers with just the attribute and a `Value` / `TryCreate` pair — the source generator and JSON converter take care of the rest. EF Core convention and the missing-EfCore-package analyzer now also recognize BoundedInt<>.
When a [NumericWrapper] type uses a concrete value type (e.g. int) as its underlying type, IEquatable<T>.Equals(T) and IComparable<T>.CompareTo(T) require the unannotated parameter type. Emitting Equals(int? other) / CompareTo(int? other) is Nullable<int>, which doesn't satisfy the interface contracts. For generic-parameter underlyings (e.g. T : INumber<T>), T? is a nullable annotation only, so the existing form remains correct. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Picks up the parts of the BoundedInt feature that didn't exist when the
original PR was opened (the OpenApi.*, Api.IntegrationTests, and AspNetCore
projects all landed on main since), and fills the EF Core gap.
- OpenAPI: BoundedInt renders as `{ type: integer, format: int32, minimum,
maximum }` on both the Microsoft and Swashbuckle pipelines. The witness
bounds are read off the closed type's static Min/Max at schema time (the
range can't be derived from the generic definition alone). Schema tests
cover value, nullable-value, and a dedicated nullables endpoint across all
three document variants.
- Api integration: BoundedIntEntity round-trips through the request pipeline
and EF Core (both providers) via the shared EntityTests suite, which also
pins the 400 ValidationProblemDetails shape and the `$.value` /
`$.nullableValue` error keys.
- EF Core: BoundedIntExtensions added to the Unwrap method-call translator so
`.Unwrap()` translates to a bare int column, matching the convention that
already recognizes BoundedInt<>.
- Unit tests: full-range witness (int.MinValue..int.MaxValue) pins the
offset-storage modular round-trip; the error-message test now asserts the
witness bounds are interpolated, not left as a literal placeholder.
- Docs: Skill numeric/openapi references and the OpenApi package readmes now
cover BoundedInt and the custom-wrapper recipe.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>KaliCZforce-pushed
the
claude/custom-type-definition-Ez4YZ
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from
June 24, 2026 08:07
b0bd53c to
98a8b86CompareWPF: BoundedInt<TBounds> is a scalar IParsable value, so it belongs in the WPF TypeConverter wiring alongside the sign wrappers. Adds it to the type description provider, a PageSize property + PageSizeBounds witness on the test view-model, and a BoundedIntBindingTests class (OneWay display, TwoWay valid, out-of-range and non-numeric validation errors). WPF readme + Skill WPF reference updated. Docs: the original BoundedInt PR missed WPF, the EF Core Unwrap translator, and OpenAPI because the guidance only covered *test* projects, never the production wiring. Adds an "Adding a new strong type — integration checklist" to CLAUDE.md enumerating every package a type must be wired through (core, EF Core convention + Unwrap translator, both OpenAPI pipelines, WPF, analyzers), with pointers to testing.md and CONTRIBUTING for tests and docs. testing.md gains the missing WPF row and a WPF binding-test section; CONTRIBUTING points at the checklist. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Summary
Closes#59. Adds
BoundedInt<TBounds>— anintconstrained to a closed[Min, Max]range carried by a witness type implementingIBounds<int>, so e.g.BoundedInt<PageSizeBounds>makes the 1..100 invariant part of the signature.While I was here I also opened up the JSON converter factory to recognize any struct carrying
[NumericWrapper], not just the four built-ins. Combined with the existing source generator, defining a brand-new validated numeric wrapper is now just an attribute and aValue/TryCreatepair — the rest (Create, equality, comparison, operators, JSON round-trip,Min/Max/Unwrapextensions) is generated. Readme has a new "Defining your own validated wrapper" section showing the recipe.What's in the diff
src/StrongTypes/Numbers/IBounds.cs— the witness interface withstatic abstract Min/Max.src/StrongTypes/Numbers/BoundedInt.cs— the struct itself. Stores an offset relative toTBounds.Minsodefault(BoundedInt<TBounds>)wrapsMinand satisfies the invariant. The dynamic "must be between … and …" error message is achieved by passing an interpolatedInvariantDescriptionthrough to the source generator, which emits it inside the partial type body whereTBoundsis in scope.NumericStrongTypeJsonConverterFactory—CanConvertnow matches by[NumericWrapper]attribute presence; underlying type is read offValuesoBoundedInt<TBounds>works without a special case.StrongTypesConvention(EF Core) +MissingEfCorePackageAnalyzer— both now recognizeBoundedInt<>.NumberExtensions—AsBounded<TBounds>/ToBounded<TBounds>onint.BoundedIntTests.cs(FsCheck property tests for in/out-of-range, boundary fixed-cases, default-invariant, equality/comparison, JSON round-trip, error-message content, extensions); analyzer test theory gets a newDetects_bounded_int_wrappercase.Per the comment on #59 about the readme number-line diagram, the actual SVG isn't included — let me know if you'd like me to follow up with one.
Test plan
dotnet build(could not run locally — no SDK in this sandbox; CI will tell us)dotnet test src/StrongTypes.Tests—BoundedIntTestscovers the issue's three test requirements (in-range round-trip, out-of-range rejection by bothTryCreateandCreate, boundary acceptance) plus generated-member branch coverage and a JSON round-trip.dotnet test src/StrongTypes.Analyzers.Tests— newDetects_bounded_int_wrapperfact.BoundedInt<PageSizeBounds>.Create(0)shows the dynamic"between 1 and 100 (inclusive)"message at runtime.https://claude.ai/code/session_01TsE6jPbPttZztM6h2g7KqR
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