[swift-dev] metatype of Int

[Slava Pestov]

You can probably get the mangled name of the metatype, and refer to that. Eg,

public func f() -> Any.Type {
  return Int.self
}

f()

Compile this with -emit-ir:

@_TMSi = external global %swift.type, align 8

define %swift.type* @_TF4blah1fFT_PMP_() #0 {
entry:
  ret %swift.type* @_TMSi
}

So in your C++ program,

extern "C" {
  extern void *_TMSi;
}

Note that this is completely unsupported, and probably insane. You have been warned.

Slava

> On Dec 18, 2015, at 12:14 PM, Rafkind, Jon via swift-dev <swift-dev at swift.org> wrote:
> 
> Sorry I should have been more specific. I am working at the C++ level. I have a swift::MetaType* and want to compare it to something.
> 
> On 12/18/2015 12:10 PM, Dave Abrahams wrote:
> 
> 
> 
> 
> On Dec 18, 2015, at 11:16 AM, Rafkind, Jon via swift-dev <swift-dev at swift.org><mailto:swift-dev at swift.org> wrote:
> 
> Given a swift::MetaType how can I tell if it corresponds to the MetaType of the standard Int type? Is there a way to get a reference to the MetaType from the StdlibModule or TheBuiltinModule?
> 
> For now I can convert the MetaType to a string and compare it to "Int.Type" but that is yucky.
> 
> 
> 
> Equality comparison works:
> 
> (swift) String.self == Int.self
> // r2 : Bool = false
> (swift) Int.self == Int.self
> // r3 : Bool = true
> 
> 
> 
> 
> 
> --
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> 
> 
> 
> -Dave
> 
> 
> 
> 
> 
> 
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