1 files changed, 20 insertions, 0 deletions
diff --git a/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/OptionalTemplate.swift b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/OptionalTemplate.swift
new file mode 100644
index 0000000000..1dac65be63
--- /dev/null
+++ b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/OptionalTemplate.swift
@@ -0,0 +1,20 @@
+fileprivate struct {{ ffi_converter_name }}: FfiConverterRustBuffer {
+    typealias SwiftType = {{ type_name }}
+
+    public static func write(_ value: SwiftType, into buf: inout [UInt8]) {
+        guard let value = value else {
+            writeInt(&buf, Int8(0))
+            return
+        }
+        writeInt(&buf, Int8(1))
+        {{ inner_type|write_fn }}(value, into: &buf)
+    }
+
+    public static func read(from buf: inout (data: Data, offset: Data.Index)) throws -> SwiftType {
+        switch try readInt(&buf) as Int8 {
+        case 0: return nil
+        case 1: return try {{ inner_type|read_fn }}(from: &buf)
+        default: throw UniffiInternalError.unexpectedOptionalTag
+        }
+    }
+}