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Consistency for ops classes #1456
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Consistency for ops classes
1. Extend AnyVal when possible, unless there are macro ops 1a. Don't take implicit params in the ops class param list, again unless there are macro ops. 2. Make all conversions to ops classes final. They are all declared in traits, so users with their own syntax hierarchy have no chance of inlining unless they are marked final. Plus, it's consistent. 3. Make all ops class constructor fields private by default, to avoid polluting the namespace of the type. Remove private val part, because scala 2.10 doesn't support it Ops class guidelines Add CartesianTest
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Original file line number | Diff line number | Diff line change |
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--- | ||
layout: page | ||
title: "Guidelines" | ||
section: "guidelines" | ||
position: 7 | ||
--- | ||
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# Guidelines | ||
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All guidelines in cats should have clear justifications. There is no room for tribal wisdom in a simple library. | ||
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## Syntax | ||
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### Composing Implicit Conversions in Traits | ||
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Implicit syntax conversions provided in publicly-exposed traits should be marked final | ||
so that any composition of the traits provides conversions that can all be inlined. | ||
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### Ops Classes | ||
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Ops classes should be marked final and extend AnyVal, to take full advantage of inlining and prevent unnecessary allocations. | ||
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The most notable exception is the case where all of the ops in the class are provided by zero-cost macros anyway, | ||
for example with Simulacrum. | ||
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#### TODO: | ||
Once we drop 2.10 support, AnyVal-extending class constructor parameters can be marked as private. |
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this method is untested.