cleanup: add Val_type.ptr as an alias for ValType::I64 (#11)

README.md

@@ -164,7 +164,7 @@ let make_kv_plugin () =
 
   let kv_read =
     let open Val_type in
-    Function.create "kv_read" ~params:[ I64 ] ~results:[ I64 ] ~user_data:()
+    Function.create "kv_read" ~params:[ ptr ] ~results:[ ptr ] ~user_data:()
     @@ fun plugin () ->
     let key = Host_function.input_string plugin in
     Printf.printf "Reading from key=%s\n" key;
@@ -177,7 +177,7 @@ let make_kv_plugin () =
 
   let kv_write =
     let open Val_type in
-    Function.create "kv_write" ~params:[ I64; I64 ] ~results:[] ~user_data:()
+    Function.create "kv_write" ~params:[ ptr; ptr ] ~results:[] ~user_data:()
     @@ fun plugin () ->
     let key = Host_function.input_string ~index:0 plugin in
     let value = Host_function.input_string ~index:1 plugin in

examples/kv.ml

@@ -15,7 +15,7 @@ let make_kv_plugin () =
 
   let kv_read =
     let open Val_type in
-    Function.create "kv_read" ~params:[ I64 ] ~results:[ I64 ] ~user_data:()
+    Function.create "kv_read" ~params:[ ptr ] ~results:[ ptr ] ~user_data:()
     @@ fun plugin () ->
     let key = Host_function.input_string plugin in
     Printf.printf "Reading from key=%s\n" key;
@@ -28,7 +28,7 @@ let make_kv_plugin () =
 
   let kv_write =
     let open Val_type in
-    Function.create "kv_write" ~params:[ I64; I64 ] ~results:[] ~user_data:()
+    Function.create "kv_write" ~params:[ ptr; ptr ] ~results:[] ~user_data:()
     @@ fun plugin () ->
     let key = Host_function.input_string ~index:0 plugin in
     let value = Host_function.input_string ~index:1 plugin in

examples/runner.ml

@@ -12,8 +12,8 @@ let functions =
     let v = Host_function.param plugin 0 in
     Host_function.set_result plugin 0 v
   in
-  let params = [ Val_type.I64 ] in
-  let results = [ Val_type.I64 ] in
+  let params = [ Val_type.ptr ] in
+  let results = [ Val_type.ptr ] in
   [
     Function.create "hello_world" ~user_data:() ~params ~results id;
     Function.create "transform_string" ~user_data:() ~params ~results id;

src/extism.mli

@@ -64,6 +64,9 @@ module Val_type : sig
     | FuncRef
     | ExternRef  (** Value type *)
 
+  val ptr : t
+  (** An alias for [I64] to signify an Extism pointer value *)
+
   val of_int : int -> t
   (** Convert from [int] to {!t},
       @raise Invalid_argument if the integer isn't valid *)

src/val_type.ml

@@ -1 +1,3 @@
 include Bindings.Extism_val_type
+
+let ptr = I64