* Let Generator use the third element of @Cast(value) on return values passed to adapters (issue tensorflow/java#345)

Author: saudet

CHANGELOG.md

@@ -1,4 +1,5 @@
 
+ * Let `Generator` use the third element of `@Cast(value)` on return values passed to adapters ([issue tensorflow/java#345](https://github.com/tensorflow/java/issues/345))
  * Prevent `Generator` from swallowing exceptions caught on `Buffer.array()` ([pull #504](https://github.com/bytedeco/javacpp/pull/504))
  * Add `enum` classes missing from config files required by GraalVM Native Image
  * Let `Parser` annotate `&&` parameters with new `@ByRef(true)` value used by `Generator` to call `std::move()`

src/main/java/org/bytedeco/javacpp/annotation/Cast.java

@@ -11,6 +11,7 @@
  * Indicates a type cast required on the argument to satisfy the native compiler.
  * When used with {@link Adapter} a second cast can also be specified making it
  * possible to apply a cast to both the argument and the adapter, in this order.
+ * A third "precast" can also be specified, which gets applied before the second one.
  * <p>
  * At the moment, {@link Generator} makes use of the simple C-style cast. If one
  * requires a different kind of type conversion, such as the {@code dynamic_cast}
@@ -25,4 +26,4 @@
 @Target({ElementType.METHOD, ElementType.PARAMETER, ElementType.ANNOTATION_TYPE})
 public @interface Cast {
     String[] value();
-}
+}

src/main/java/org/bytedeco/javacpp/tools/Generator.java

@@ -2394,7 +2394,11 @@ String returnBefore(MethodInformation methodInfo) {
 
                 if (adapterInfo != null) {
                     usesAdapters = true;
-                    returnPrefix = adapterInfo.name + " radapter(";
+                    String cast2 = adapterInfo.cast2.trim();
+                    if (cast2.length() > 0 && !cast2.startsWith("(") && !cast2.endsWith(")")) {
+                        cast2 = "(" + cast2 + ")";
+                    }
+                    returnPrefix = adapterInfo.name + " radapter(" + cast2;
                 }
             }
         }