java/Ref: allow LocalRef to be nullable

Makes using the Java glue classes simpler to use, at the cost of very little overhead.

java/Ref: allow LocalRef to be nullable
1d49f110 · Max Kellermann · 791245de · 1d49f110
Commit 1d49f110 authored Apr 11, 2019 by Max Kellermann
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Showing with 6 additions and 2 deletions

Ref.hxx src/java/Ref.hxx +6 -2

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--- a/src/java/Ref.hxx
+++ b/src/java/Ref.hxx
@@ -47,13 +47,13 @@ namespace Java {

 	public:
 		/**
-		 * The local reference is obtained by the caller.
+		 * The local reference is obtained by the caller.  May
+		 * be nullptr.
 		 */
 		LocalRef(JNIEnv *_env, T _value) noexcept
 			:env(_env), value(_value)
 		{
 			assert(env != nullptr);
-			assert(value != nullptr);
 		}

 		~LocalRef() noexcept {
@@ -67,6 +67,10 @@ namespace Java {
 			return env;
 		}

+		operator bool() const noexcept {
+			return value != nullptr;
+		}
+
 		T Get() const noexcept {
 			return value;
 		}