Add support for static anonymous functions#988
Add support for static anonymous functions#988RexJaeschke wants to merge 6 commits intodotnet:draft-v9from
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| A non-`static` local function or non-`static` anonymous function can capture state from an enclosing `static` anonymous function, but cannot capture state outside the enclosing static anonymous function. | ||
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| Removing the `static` modifier from an anonymous function in a valid program does not change the meaning of the program. |
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Should static ensure that all delegate instances converted from the same anonymous function shall compare equal? (That would not require any caching of delegate instances.)
using System;
using System.Diagnostics;
class C {
Action G() {
return static () => {};
}
void M() {
Debug.Assert(G() == G());
}
}I think static should not guarantee this equality. IIRC Roslyn generates an instance method even for a static anonymous function because it is more efficient for the calling convention. Then the delegate will refer to some instance, and will compare unequal if it refers to a different instance. Requiring such an implementation to ensure that the same instance is used every time might cost additional interlocked operations for thread safety.
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Maybe a note about this in the specification of delegate equality would be useful though.
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Closing in favor of #1461 |
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