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@@ -1,53 +1,74 @@
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-#region Copyright notice and license
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-// Protocol Buffers - Google's data interchange format
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-// Copyright 2008 Google Inc. All rights reserved.
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-// https://developers.google.com/protocol-buffers/
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-//
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-// Redistribution and use in source and binary forms, with or without
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-// modification, are permitted provided that the following conditions are
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-// met:
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-//
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-// * Redistributions of source code must retain the above copyright
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-// notice, this list of conditions and the following disclaimer.
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-// * Redistributions in binary form must reproduce the above
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-// copyright notice, this list of conditions and the following disclaimer
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-// in the documentation and/or other materials provided with the
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-// distribution.
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-// * Neither the name of Google Inc. nor the names of its
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-// contributors may be used to endorse or promote products derived from
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-// this software without specific prior written permission.
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-//
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-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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-#endregion
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-
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-using System;
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-
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-namespace Google.Protobuf
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-{
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- /// <summary>
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- /// Helper methods for throwing exceptions
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- /// </summary>
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- internal static class ThrowHelper
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- {
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- /// <summary>
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- /// Throws an ArgumentNullException if the given value is null.
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- /// </summary>
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- internal static void ThrowIfNull(object value, string name)
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- {
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- if (value == null)
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- {
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- throw new ArgumentNullException(name);
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- }
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- }
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- }
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+#region Copyright notice and license
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+// Protocol Buffers - Google's data interchange format
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+// Copyright 2008 Google Inc. All rights reserved.
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+// https://developers.google.com/protocol-buffers/
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+//
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+// Redistribution and use in source and binary forms, with or without
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+// modification, are permitted provided that the following conditions are
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+// met:
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+//
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+// * Redistributions of source code must retain the above copyright
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+// notice, this list of conditions and the following disclaimer.
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+// * Redistributions in binary form must reproduce the above
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+// copyright notice, this list of conditions and the following disclaimer
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+// in the documentation and/or other materials provided with the
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+// distribution.
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+// * Neither the name of Google Inc. nor the names of its
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+// contributors may be used to endorse or promote products derived from
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+// this software without specific prior written permission.
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+//
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+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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+#endregion
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+
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+using System;
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+
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+namespace Google.Protobuf
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+{
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+ /// <summary>
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+ /// Helper methods for throwing exceptions
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+ /// </summary>
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+ public static class Preconditions
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+ {
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+ /// <summary>
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+ /// Throws an ArgumentNullException if the given value is null, otherwise
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+ /// return the value to the caller.
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+ /// </summary>
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+ public static T CheckNotNull<T>(T value, string name) where T : class
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+ {
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+ if (value == null)
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+ {
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+ throw new ArgumentNullException(name);
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+ }
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+ return value;
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+ }
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+
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+ /// <summary>
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+ /// Throws an ArgumentNullException if the given value is null, otherwise
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+ /// return the value to the caller.
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+ /// </summary>
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+ /// <remarks>
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+ /// This is equivalent to <see cref="CheckNotNull"/> but without the type parameter
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+ /// constraint. In most cases, the constraint is useful to prevent you from calling CheckNotNull
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+ /// with a value type - but it gets in the way if either you want to use it with a nullable
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+ /// value type, or you want to use it with an unconstrained type parameter.
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+ /// </remarks>
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+ internal static T CheckNotNullUnconstrained<T>(T value, string name)
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+ {
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+ if (value == null)
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+ {
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+ throw new ArgumentNullException(name);
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+ }
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+ return value;
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+ }
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+ }
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}
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Jon Skeet