What is __argvalue?

Question

Also, there is one other thing that is an lvalue in VC#, though it's a language extension - __argvalue().

Source

That was the only Google result for __argvalue.

I tried it in LINQPad and it doesn't seem to exist.

Gambell

No, this StackOverflow post also appears in Google when searching for "__argvalue". :-) – Everick

I was waiting for someone to say that. – Gambell

Yeah, Visual Studio recognises the other "secret" C# keywords that I know of - __arglist, __makeref, __reftype and __refvalue - and highlights them like any other. No such luck with __argvalue though. – Heda

Pavel clearly meant __arglist. I'll fix the typo. – Tabret

How can __arglist be an lvalue? – Gambell

Answer 1

I can definitively state that there is no __argvalue in C# as of .NET Framework 4.0. The compiler binary contains a table of tokens. You can find the other hidden __ prefixed keywords starting at 0x00009840. However, a search of the entire binary shows that there is no __argvalue token.

The author of that comment may have been referring to __arglist, which can be an lvalue.

Borges