I need helping understanding a pointer example

[Todd Chester via perl6-users]

Hi All,

Over at

https://docs.raku.org/language/nativecall.html#Basic_use_of_pointers

There is an example:

   useNativeCall;
   classFooHandleisrepr('CPointer') {
   # Here are the actual NativeCall functions.
   subFoo_init() returnsFooHandleisnative("foo") {*}
   subFoo_free(FooHandle) isnative("foo") {*}
   subFoo_query(FooHandle, Str) returnsint8isnative("foo") {*}
   subFoo_close(FooHandle) returnsint8isnative("foo") {*}
   # Here are the methods we use to expose it to the outside world.
   methodnew{
   Foo_init();
   }
   methodquery(Str$stmt) {
   Foo_query(self, $stmt);
   }
   methodclose{
   Foo_close(self);
   }
   # Free data when the object is garbage collected.
   submethodDESTROY{
   Foo_free(self);
   }
   }

I just can't keeping my head what is going on.

Questions:

1) How can I get a list of what types are imported (like Pointer
and CArray) when I `use nativeCall` and what their definitions
are?

2) on

   # Here are the actual NativeCall functions.
   subFoo_init() returnsFooHandleisnative("foo") {*}
   subFoo_free(FooHandle) isnative("foo") {*}
   subFoo_query(FooHandle, Str) returnsint8isnative("foo") {*}
   subFoo_close(FooHandle) returnsint8isnative("foo") {*}

He called subs exported from NativeCall "foo*"?

What does hemean by `# Here are the actual NativeCall functions.`?

If he means these are fictitious "C" calls formatted into NativeCall
format, he in NOT BEING HELPFUL.  I need to see BOTH the actual "C"
calls as well as how he formatted them to NativeCall.

3) what is ?
subFoo_init() returnsFooHandleisnative("foo") {*}`

4) what is ?
    subFoo_free(FooHandle) isnative("foo") {*}

5) what is ?
subFoo_query(FooHandle, Str) returnsint8isnative("foo") {*}

6) what is ?
subFoo_close(FooHandle) returnsint8isnative("foo") {*}

7) A) in the below, where did `self` come from?  Is it a type?

   B) not to ask too stupid a question, but what does "method"
        do for me?

   methodquery(Str$stmt) {
   Foo_query(self, $stmt);
   }


Just a general comment:

It would be wonderful if the docs would show actual "C" calls
from something like Kernel32.dll and how to access them
with NativeCall.

For instance:

   |LSTATUS RegQueryValueExA( HKEY hKey, LPCSTR lpValueName, LPDWORD
   lpReserved, LPDWORD lpType, LPBYTE lpData, LPDWORD lpcbData );
   |

|The example should go over what to give NativeCall for|
|all of the above "C" types.|
||
Yours in Confusion,,
-T