EditorPrefBool.cs

using System;

namespace UnityEditor.Rendering
{
    /// <summary>
    /// Bool saved in EditorPref.
    /// </summary>
    public struct EditorPrefBool
    {
        readonly string m_Key;

        /// <summary>
        /// Value of the boolean in editor preferences.
        /// </summary>
        public bool value
        {
            get => EditorPrefs.GetBool(m_Key);
            set => EditorPrefs.SetBool(m_Key, value);
        }

        /// <summary>
        /// Constructor
        /// </summary>
        /// <param name="key">Key in the editor preferences.</param>
        /// <param name="defaultValue">Default value of the preference.</param>
        public EditorPrefBool(string key, bool defaultValue = false)
        {
            m_Key = key;

            //register key if not already there
            if (!EditorPrefs.HasKey(m_Key))
            {
                EditorPrefs.SetBool(m_Key, defaultValue);
            }
        }
    }
}