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Additional guidance around casts:

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- Warn on unnecessary casts
- Avoid casts on arithmetic types
- Add specializations of the rules for Pro-type-reinterpretcast
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Zachary Henkel 2017-05-09 16:17:45 -07:00
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@ -11235,6 +11235,7 @@ If you feel the need for a lot of casts, there may be a fundamental design probl
* Force the elimination of C-style casts
* Warn against named casts
* Warn if there are many functional style casts (there is an obvious problem in quantifying 'many').
* Warn against unnecessary casts.
### <a name="Res-casts-named"></a>ES.49: If you must use a cast, use a named cast
@ -11287,7 +11288,8 @@ for example.)
##### Enforcement
Flag C-style and functional casts.
* Flag C-style and functional casts.
* Suggest brace initialization or gsl::narrow_cast instead of named casts on arithmetic types.
### <a name="Res-casts-const"></a>ES.50: Don't cast away `const`
@ -18570,7 +18572,9 @@ Use of these casts can violate type safety and cause the program to access a var
##### Enforcement
Issue a diagnostic for any use of `reinterpret_cast`. To fix: Consider using a `variant` instead.
* Issue a diagnostic for any use of `reinterpret_cast`. To fix: Consider using a `variant` instead.
* Issue a separate diagnostic for any reinterpret_cast to void*. To fix: Remove the cast and allow the implicit type conversion.
* Issue a separate diagnostic for any reinterpret_cast from void*. To fix: Use static_cast instead
### <a name="Pro-type-downcast"></a>Type.2: Don't use `static_cast` downcasts. Use `dynamic_cast` instead.