Wes xx mediapipe integration

Packages/com.github.homuler.mediapipe/Runtime/Scripts/External/StdString.cs

@@ -0,0 +1,32 @@
+// Copyright (c) 2021 homuler
+//
+// Use of this source code is governed by an MIT-style
+// license that can be found in the LICENSE file or at
+// https://opensource.org/licenses/MIT.
+
+using System;
+
+namespace Mediapipe
+{
+  public class StdString : MpResourceHandle
+  {
+    public StdString(IntPtr ptr, bool isOwner = true) : base(ptr, isOwner) { }
+
+    public StdString(byte[] bytes) : base()
+    {
+      UnsafeNativeMethods.std_string__PKc_i(bytes, bytes.Length, out var ptr).Assert();
+      this.ptr = ptr;
+    }
+
+    protected override void DeleteMpPtr()
+    {
+      UnsafeNativeMethods.std_string__delete(ptr);
+    }
+
+    public void Swap(StdString str)
+    {
+      UnsafeNativeMethods.std_string__swap__Rstr(mpPtr, str.mpPtr);
+      GC.KeepAlive(this);
+    }
+  }
+}