[Issue 7897] Problem with alias template parameter

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=7897


Walter Bright <bugzilla at digitalmars.com> changed:

           What    |Removed                     |Added
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                 CC|                            |bugzilla at digitalmars.com


--- Comment #1 from Walter Bright <bugzilla at digitalmars.com> 2012-04-20 11:44:45 PDT ---
======
    // register function in struct (doesn't work, won't take alias for some
reason?)
    HookupEngineFunction!( d.outputDebug )( pImports );
======

This is failing to compile because outputDebug is a non-static member function
of struct Debug. This means that a 'this' pointer is required. The parameter
'alias funcptr' to HookupEngineFunction requires an argument that is a symbolic
alias. But you're supplying a runtime value, d.outputDebug, that cannot be
evaluated at compile time.

In other words, d.outputDebug would be a delegate, and delegates can only be
constructed at runtime because they consist of a pair: a 'this' pointer and the
address of the function. The 'this' pointer cannot be determined at compile
time.

If you make Debug.outputDebug a static member function, it will compile.

This is not a compiler bug.

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