Implement SafeContextOptionsHandle as a wrapper for TFE_ContextOptions

src/TensorFlowNET.Core/Eager/Context.cs

@@ -16,7 +16,7 @@ namespace Tensorflow.Eager
 
         public Context(ContextOptions opts, Status status)
         {
-            Handle = c_api.TFE_NewContext(opts, status.Handle);
+            Handle = c_api.TFE_NewContext(opts.Handle, status.Handle);
             status.Check(true);
         }
 

src/TensorFlowNET.Core/Eager/ContextOptions.cs

@@ -1,26 +1,33 @@
-using System;
-using System.IO;
+/*****************************************************************************
+   Copyright 2018 The TensorFlow.NET Authors. All Rights Reserved.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+******************************************************************************/
+
+using System;
 
 namespace Tensorflow.Eager
 {
-    public class ContextOptions : DisposableObject
+    public sealed class ContextOptions : IDisposable
     {
-        public ContextOptions() : base(c_api.TFE_NewContextOptions())
-        { }
+        public SafeContextOptionsHandle Handle { get; }
 
-        /// <summary>
-        ///     Dispose any unmanaged resources related to given <paramref name="handle"/>.
-        /// </summary>
-        protected sealed override void DisposeUnmanagedResources(IntPtr handle) 
-            => c_api.TFE_DeleteContextOptions(_handle);
+        public ContextOptions()
+        {
+            Handle = c_api.TFE_NewContextOptions();
+        }
 
-
-        public static implicit operator IntPtr(ContextOptions opts) 
-            => opts._handle;
-
-        public static implicit operator TFE_ContextOptions(ContextOptions opts)
-            => new TFE_ContextOptions(opts._handle);
-        
+        public void Dispose()
+            => Handle.Dispose();
     }
-
 }

src/TensorFlowNET.Core/Eager/SafeContextOptionsHandle.cs

@@ -0,0 +1,40 @@
+/*****************************************************************************
+   Copyright 2018 The TensorFlow.NET Authors. All Rights Reserved.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+******************************************************************************/
+
+using System;
+using Tensorflow.Util;
+
+namespace Tensorflow.Eager
+{
+    public sealed class SafeContextOptionsHandle : SafeTensorflowHandle
+    {
+        public SafeContextOptionsHandle()
+        {
+        }
+
+        public SafeContextOptionsHandle(IntPtr handle)
+            : base(handle)
+        {
+        }
+
+        protected override bool ReleaseHandle()
+        {
+            c_api.TFE_DeleteContextOptions(handle);
+            SetHandle(IntPtr.Zero);
+            return true;
+        }
+    }
+}

src/TensorFlowNET.Core/Eager/TFE_ContextOptions.cs

@@ -1,23 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.Text;
-
-namespace Tensorflow.Eager
-{
-    public struct TFE_ContextOptions
-    {
-        IntPtr _handle;
-
-        public TFE_ContextOptions(IntPtr handle)
-            => _handle = handle;
-
-        public static implicit operator TFE_ContextOptions(IntPtr handle)
-            => new TFE_ContextOptions(handle);
-
-        public static implicit operator IntPtr(TFE_ContextOptions tensor)
-            => tensor._handle;
-
-        public override string ToString()
-            => $"TFE_ContextOptions {_handle}";
-    }
-}

src/TensorFlowNET.Core/Eager/c_api.eager.cs

@@ -52,7 +52,7 @@ namespace Tensorflow
         /// </summary>
         /// <returns>TFE_ContextOptions*</returns>
         [DllImport(TensorFlowLibName)]
-        public static extern TFE_ContextOptions TFE_NewContextOptions();
+        public static extern SafeContextOptionsHandle TFE_NewContextOptions();
 
         /// <summary>
         /// Destroy an options object.
@@ -114,7 +114,7 @@ namespace Tensorflow
         /// <param name="status">TF_Status*</param>
         /// <returns>TFE_Context*</returns>
         [DllImport(TensorFlowLibName)]
-        public static extern SafeContextHandle TFE_NewContext(IntPtr opts, SafeStatusHandle status);
+        public static extern SafeContextHandle TFE_NewContext(SafeContextOptionsHandle opts, SafeStatusHandle status);
 
         [DllImport(TensorFlowLibName)]
         public static extern void TFE_ContextStartStep(SafeContextHandle ctx);
@@ -254,7 +254,7 @@ namespace Tensorflow
         /// <param name="opts">TFE_ContextOptions*</param>
         /// <param name="enable">unsigned char</param>
         [DllImport(TensorFlowLibName)]
-        public static extern void TFE_ContextOptionsSetAsync(IntPtr opts, byte enable);
+        public static extern void TFE_ContextOptionsSetAsync(SafeContextOptionsHandle opts, byte enable);
 
         /// <summary>
         /// 

test/TensorFlowNET.UnitTest/NativeAPI/CApiTest.cs

@@ -102,15 +102,12 @@ namespace TensorFlowNET.UnitTest
         protected void TFE_Execute(IntPtr op, IntPtr[] retvals, ref int num_retvals, SafeStatusHandle status)
             => c_api.TFE_Execute(op, retvals, ref num_retvals, status);
 
-        protected IntPtr TFE_NewContextOptions()
+        protected SafeContextOptionsHandle TFE_NewContextOptions()
             => c_api.TFE_NewContextOptions();
 
-        protected SafeContextHandle TFE_NewContext(IntPtr opts, SafeStatusHandle status)
+        protected SafeContextHandle TFE_NewContext(SafeContextOptionsHandle opts, SafeStatusHandle status)
             => c_api.TFE_NewContext(opts, status);
 
-        protected void TFE_DeleteContextOptions(IntPtr opts)
-            => c_api.TFE_DeleteContextOptions(opts);
-
         protected int TFE_OpGetInputLength(IntPtr op, string input_name, SafeStatusHandle status)
             => c_api.TFE_OpGetInputLength(op, input_name, status);
 

test/TensorFlowNET.UnitTest/NativeAPI/Eager/CApi.Eager.Context.cs

@@ -1,6 +1,7 @@
 using Microsoft.VisualStudio.TestTools.UnitTesting;
 using System;
 using Tensorflow;
+using Tensorflow.Eager;
 
 namespace TensorFlowNET.UnitTest.NativeAPI
 {
@@ -13,13 +14,16 @@ namespace TensorFlowNET.UnitTest.NativeAPI
         public void Context()
         {
             using var status = c_api.TF_NewStatus();
-            var opts = c_api.TFE_NewContextOptions();
 
-            IntPtr devices;
-            using (var ctx = c_api.TFE_NewContext(opts, status))
+            static SafeContextHandle NewContext(SafeStatusHandle status)
             {
-                c_api.TFE_DeleteContextOptions(opts);
+                using var opts = c_api.TFE_NewContextOptions();
+                return c_api.TFE_NewContext(opts, status);
+            }
 
+            IntPtr devices;
+            using (var ctx = NewContext(status))
+            {
                 devices = c_api.TFE_ContextListDevices(ctx, status);
                 EXPECT_EQ(TF_OK, TF_GetCode(status), TF_Message(status));
             }

test/TensorFlowNET.UnitTest/NativeAPI/Eager/CApi.Eager.Execute_MatMul_CPU.cs

@@ -1,6 +1,7 @@
 using Microsoft.VisualStudio.TestTools.UnitTesting;
 using System;
 using Tensorflow;
+using Tensorflow.Eager;
 using static Tensorflow.Binding;
 
 namespace TensorFlowNET.UnitTest.NativeAPI
@@ -19,14 +20,18 @@ namespace TensorFlowNET.UnitTest.NativeAPI
         unsafe void Execute_MatMul_CPU(bool async)
         {
             using var status = TF_NewStatus();
-            var opts = TFE_NewContextOptions();
-            c_api.TFE_ContextOptionsSetAsync(opts, Convert.ToByte(async));
+
+            static SafeContextHandle NewContext(bool async, SafeStatusHandle status)
+            {
+                using var opts = c_api.TFE_NewContextOptions();
+                c_api.TFE_ContextOptionsSetAsync(opts, Convert.ToByte(async));
+                return c_api.TFE_NewContext(opts, status);
+            }
 
             IntPtr t;
-            using (var ctx = TFE_NewContext(opts, status))
+            using (var ctx = NewContext(async, status))
             {
                 CHECK_EQ(TF_OK, TF_GetCode(status), TF_Message(status));
-                TFE_DeleteContextOptions(opts);
 
                 var m = TestMatrixTensorHandle();
                 var matmul = MatMulOp(ctx, m, m);

test/TensorFlowNET.UnitTest/NativeAPI/Eager/CApi.Eager.OpGetInputAndOutputLengths.cs

@@ -2,7 +2,6 @@
 using System;
 using Tensorflow;
 using Tensorflow.Eager;
-using Buffer = System.Buffer;
 
 namespace TensorFlowNET.UnitTest.NativeAPI
 {
@@ -15,10 +14,15 @@ namespace TensorFlowNET.UnitTest.NativeAPI
         public unsafe void OpGetInputAndOutputLengths()
         {
             using var status = TF_NewStatus();
-            var opts = TFE_NewContextOptions();
-            using var ctx = TFE_NewContext(opts, status);
+
+            static SafeContextHandle NewContext(SafeStatusHandle status)
+            {
+                using var opts = c_api.TFE_NewContextOptions();
+                return c_api.TFE_NewContext(opts, status);
+            }
+
+            using var ctx = NewContext(status);
             CHECK_EQ(TF_OK, TF_GetCode(status), TF_Message(status));
-            TFE_DeleteContextOptions(opts);
 
             var input1 = TestMatrixTensorHandle();
             var input2 = TestMatrixTensorHandle();

test/TensorFlowNET.UnitTest/NativeAPI/Eager/CApi.Eager.OpInferMixedTypeInputListAttrs.cs

@@ -1,10 +1,7 @@
 using Microsoft.VisualStudio.TestTools.UnitTesting;
 using System;
-using System.Collections.Generic;
 using Tensorflow;
 using Tensorflow.Eager;
-using Buffer = System.Buffer;
-using System.Linq;
 
 namespace TensorFlowNET.UnitTest.NativeAPI
 {
@@ -17,10 +14,15 @@ namespace TensorFlowNET.UnitTest.NativeAPI
         public unsafe void OpInferMixedTypeInputListAttrs()
         {
             using var status = TF_NewStatus();
-            var opts = TFE_NewContextOptions();
-            using var ctx = TFE_NewContext(opts, status);
+
+            static SafeContextHandle NewContext(SafeStatusHandle status)
+            {
+                using var opts = c_api.TFE_NewContextOptions();
+                return c_api.TFE_NewContext(opts, status);
+            }
+
+            using var ctx = NewContext(status);
             CHECK_EQ(TF_OK, TF_GetCode(status), TF_Message(status));
-            TFE_DeleteContextOptions(opts);
 
             var condition = TestScalarTensorHandle(true);
             var t1 = TestMatrixTensorHandle();

test/TensorFlowNET.UnitTest/NativeAPI/Eager/CApi.Eager.TensorHandleDevices.cs

@@ -2,7 +2,6 @@
 using System;
 using Tensorflow;
 using Tensorflow.Eager;
-using Buffer = System.Buffer;
 
 namespace TensorFlowNET.UnitTest.NativeAPI
 {
@@ -15,9 +14,14 @@ namespace TensorFlowNET.UnitTest.NativeAPI
         public unsafe void TensorHandleDevices()
         {
             var status = c_api.TF_NewStatus();
-            var opts = TFE_NewContextOptions();
-            using var ctx = TFE_NewContext(opts, status);
-            TFE_DeleteContextOptions(opts);
+
+            static SafeContextHandle NewContext(SafeStatusHandle status)
+            {
+                using var opts = c_api.TFE_NewContextOptions();
+                return c_api.TFE_NewContext(opts, status);
+            }
+
+            using var ctx = NewContext(status);
             ASSERT_EQ(TF_OK, TF_GetCode(status), TF_Message(status));
 
             var hcpu = TestMatrixTensorHandle();

test/TensorFlowNET.UnitTest/NativeAPI/Eager/CApi.Eager.Variables.cs

@@ -1,6 +1,7 @@
 using Microsoft.VisualStudio.TestTools.UnitTesting;
 using System;
 using Tensorflow;
+using Tensorflow.Eager;
 using static Tensorflow.Binding;
 
 namespace TensorFlowNET.UnitTest.NativeAPI
@@ -14,10 +15,15 @@ namespace TensorFlowNET.UnitTest.NativeAPI
         public unsafe void Variables()
         {
             using var status = c_api.TF_NewStatus();
-            var opts = TFE_NewContextOptions();
-            using var ctx = TFE_NewContext(opts, status);
+
+            static SafeContextHandle NewContext(SafeStatusHandle status)
+            {
+                using var opts = c_api.TFE_NewContextOptions();
+                return c_api.TFE_NewContext(opts, status);
+            }
+
+            using var ctx = NewContext(status);
             ASSERT_EQ(TF_OK, TF_GetCode(status), TF_Message(status));
-            TFE_DeleteContextOptions(opts);
 
             var var_handle = CreateVariable(ctx, 12.0f, status);
             ASSERT_EQ(TF_OK, TF_GetCode(status), TF_Message(status));