Wrapper struct for delegates. Helps avoid mistakes like '=' when '+=' was intended. Also checks for null automatically before invoke.

DelegateWrappers.cs

/*
 * Created by C.J. Kimberlin (http://cjkimberlin.com)
 * 
 * The MIT License (MIT)
 * 
 * Copyright (c) 2014 
 * 
 * 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.
 * 
 * 
 * 
 * ============= Description =============
 * 
 * These are simple wrappers around delegates to help prevent simple mistakes like
 * accidently overriding other registered delegates by doing = instead of +=. Also
 * automatically will check if the callback is null before invoking.
 * 
 * Notification onEvent1;
 * Notification<int> onEvent2;
 * 
 * onEvent1.Register(SomeFunction);
 * onEvent2.Register(SomeFunctionWithIntArg);
 * 
 * onEvent1.Invoke();
 * onEvent2.Invoke(5);
 * */

public struct Notification
{
    public System.Action internalDelegate;

    public void Register(System.Action func)
    {
        internalDelegate += func;
    }

    public void Unregister(System.Action func)
    {
        internalDelegate -= func;
    }

    public void Invoke()
    {
        if (internalDelegate != null)
        {
            internalDelegate();
        }
    }

    public void UnregisterAll()
    {
        internalDelegate = null;
    }
}

public struct Notification<T1>
{
    public System.Action<T1> internalDelegate;

    public void Register(System.Action<T1> func)
    {
        internalDelegate += func;
    }

    public void Unregister(System.Action<T1> func)
    {
        internalDelegate -= func;
    }

    public void Invoke(T1 t1)
    {
        if (internalDelegate != null)
        {
            internalDelegate(t1);
        }
    }

    public void UnregisterAll()
    {
        internalDelegate = null;
    }
}

public struct Notification<T1, T2>
{
    public System.Action<T1, T2> internalDelegate;

    public void Register(System.Action<T1, T2> func)
    {
        internalDelegate += func;
    }

    public void Unregister(System.Action<T1, T2> func)
    {
        internalDelegate -= func;
    }

    public void Invoke(T1 t1, T2 t2)
    {
        if (internalDelegate != null)
        {
            internalDelegate(t1, t2);
        }
    }

    public void UnregisterAll()
    {
        internalDelegate = null;
    }
}

public struct Notification<T1, T2, T3>
{
    public System.Action<T1, T2, T3> internalDelegate;

    public void Register(System.Action<T1, T2, T3> func)
    {
        internalDelegate += func;
    }

    public void Unregister(System.Action<T1, T2, T3> func)
    {
        internalDelegate -= func;
    }

    public void Invoke(T1 t1, T2 t2, T3 t3)
    {
        if (internalDelegate != null)
        {
            internalDelegate(t1, t2, t3);
        }
    }

    public void UnregisterAll()
    {
        internalDelegate = null;
    }
}