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Updated C# and .NET docs supplement (markdown)

YoshiRulz 2024-11-20 01:04:47 +10:00
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C#-and-.NET-docs-supplement.md

@ -66,7 +66,53 @@ You can only have 1 `default:` branch (not to be confused with `case default:`),
## `MemoryMarshal.Cast` can't be used with reference types
See [this SO answer](https://stackoverflow.com/a/79146967/7467292). tl;dr: It's possible in .NET Core only.
See [this SO answer](https://stackoverflow.com/a/79146967). tl;dr: It's possible in .NET Core only.
<details>
<summary>full implementations of extension methods for later</summary>
```csharp
public static Span<TTo> Cast<TFrom, TTo>(Span<TFrom> span)
where TTo: class
where TFrom: class
{
if (typeof(TTo).IsAssignableFrom(typeof(TFrom))) throw new InvalidCastException();
return UnsafeDowncast<TFrom, TTo>(span);
}
public static ReadOnlySpan<TTo> Cast<TFrom, TTo>(ReadOnlySpan<TFrom> span)
where TTo: class
where TFrom: class
{
if (typeof(TTo).IsAssignableFrom(typeof(TFrom))) throw new InvalidCastException();
return UnsafeDowncast<TFrom, TTo>(span);
}
public static Span<TBase> CastUp<TDerived, TBase>(Span<TDerived> span)
where TBase: class
where TDerived: class, TBase
=> UnsafeDowncast<TDerived, TBase>(span);
public static ReadOnlySpan<TBase> CastUp<TDerived, TBase>(ReadOnlySpan<TDerived> span)
where TBase: class
where TDerived: class, TBase
=> UnsafeDowncast<TDerived, TBase>(span);
public static Span<TTo> UnsafeDowncast<TFrom, TTo>(Span<TFrom> span)
where TTo: class
where TFrom: class
=> MemoryMarshal.CreateSpan<TTo>(
ref Unsafe.As<TFrom, TTo>(ref MemoryMarshal.GetReference(span)),
span.Length);
public static ReadOnlySpan<TTo> UnsafeDowncast<TFrom, TTo>(ReadOnlySpan<TFrom> span)
where TTo: class
where TFrom: class
=> MemoryMarshal.CreateReadOnlySpan<TTo>(
ref Unsafe.As<TFrom, TTo>(ref MemoryMarshal.GetReference(span)),
span.Length);
```
</details>
## MSBuild `Condition` placement