midi: Use std::optional instead of std::unique_ptr

Since Android R, Parcel provides read/write methods for "@nullable"
values using std::optional.

Bug: 149784838
Test: m
Change-Id: I5c6a87072ced2f2a3a16df374244bb0aff5f9cb3

1 files changed, 3 insertions, 3 deletions

diff --git a/media/native/midi/MidiDeviceInfo.cpp b/media/native/midi/MidiDeviceInfo.cpp
index ac68d26c935b..8a573fba322b 100644
--- a/media/native/midi/MidiDeviceInfo.cpp
+++ b/media/native/midi/MidiDeviceInfo.cpp
@@ -90,13 +90,13 @@ status_t MidiDeviceInfo::readFromParcel(const Parcel* parcel) {
 
 status_t MidiDeviceInfo::readStringVector(
         const Parcel* parcel, Vector<String16> *vectorPtr, size_t defaultLength) {
-    std::unique_ptr<std::vector<std::unique_ptr<String16>>> v;
+    std::optional<std::vector<std::optional<String16>>> v;
     status_t result = parcel->readString16Vector(&v);
     if (result != OK) return result;
     vectorPtr->clear();
-    if (v.get() != nullptr) {
+    if (v) {
         for (const auto& iter : *v) {
-            if (iter.get() != nullptr) {
+            if (iter) {
                 vectorPtr->push_back(*iter);
             } else {
                 vectorPtr->push_back(String16());