January 17, 2018 @safe matching on subclass type | ||||
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Why isn't polymorphic down-casts such as in the following pattern matching on sub-class class Base {} class Sub : Base {} @safe unittest { auto base = new Base(); if (auto sub = cast(Sub)base) { // use sub } } allowed in safe D? |
January 17, 2018 Re: @safe matching on subclass type | ||||
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Posted in reply to Nordlöw | On Wednesday, 17 January 2018 at 13:19:42 UTC, Nordlöw wrote:
> Why isn't polymorphic down-casts such as in the following pattern matching on sub-class
>
> class Base {}
> class Sub : Base {}
>
> @safe unittest
> {
> auto base = new Base();
> if (auto sub = cast(Sub)base)
> {
> // use sub
> }
> }
>
> allowed in safe D?
Just discovered that the base instance was const. My mistake...
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