/*
 * QR code generator library (.NET)
 *
 * Copyright (c) Manuel Bleichenbacher (MIT License)
 * https://github.com/manuelbl/QrCodeGenerator
 * Copyright (c) Project Nayuki (MIT License)
 * https://www.nayuki.io/page/qr-code-generator-library
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 */

using System;
using System.Collections;

namespace zero.Rendering.QrCode;

/// <summary>
/// Helper functions to check for valid arguments.
/// </summary>
internal static class Objects
{
  /// <summary>
  /// Ensures that the specified argument is <i>not null</i>.
  /// <para>
  /// Throws a <see cref="ArgumentNullException"/> exception if the argument is <c>null</c>.
  /// </para>
  /// </summary>
  /// <typeparam name="T">The type of the argument.</typeparam>
  /// <param name="arg">The argument to check.</param>
  /// <returns>Argument passed to function.</returns>
  /// <exception cref="ArgumentNullException">The specified argument is <c>null</c>.</exception>
  internal static T RequireNonNull<T>(T arg)
  {
    if (arg == null)
    {
      throw new ArgumentNullException();
    }
    return arg;
  }
}