public static class ComponentExtensions {

    public static T WarnIfNull<T>( this Component lhs, T obj ) where T : Object => (T) lhs.WarnIfNull( obj, typeof( T ) );
    public static Object WarnIfNull( this Component lhs, Object obj, Type type ) {
        #if DEBUG
        if ( obj == null ) GameObjectExtensions.WarnNullComponent( type, lhs.name );
        #endif
        return obj;
    }

    public static T GetOrAddComponent<T>( this Component lhs ) where T : Component => (T) lhs.GetOrAddComponent( typeof( T ) );
    public static Component GetOrAddComponent( this Component lhs, Type type ) {
        return lhs.GetComponent( type ) ?? lhs.gameObject.AddComponent( type );
    }

    public static T GetComponentSafe<T> ( this Component lhs ) where T : Component => (T) lhs.GetComponentSafe( typeof( T ) );
    public static Component GetComponentSafe( this Component lhs, Type type ) {
        return lhs.WarnIfNull( lhs.GetComponent( type ) );
    }

    public static Component LazyGetComponent( this Component lhs, ref Component component, Type type ) {
        //return value ?? lhs.GetComponent( type ); // no good. doesn't update the referenced value
        //return value = (value == null) ? lhs.GetComponent( type ) : value; // not ideal. always reassigns value
        return component ?? (component = lhs.GetComponent( type )); // only assign if null
    }
    public static T LazyGetComponent<T>( this Component lhs, ref T component ) where T : Component {
        return component ?? (component = lhs.GetComponent<T>());
    }

    public static Component LazyGetOrAddComponent( this Component lhs, ref Component component, Type type ) {
        return component ?? (component = lhs.GetOrAddComponent( type ));
    }
    public static T LazyGetOrAddComponent<T>( this Component lhs, ref T component ) where T : Component {
        return component ?? (component = lhs.GetOrAddComponent<T>());
    }

    public static Component LazyGetComponentSafe( this Component lhs, ref Component component, Type type ) {
        return lhs.WarnIfNull( lhs.LazyGetComponent( ref component, type ) );
    }
    public static T LazyGetComponentSafe<T>( this Component lhs, ref T component ) where T : Component {
        return lhs.WarnIfNull( lhs.LazyGetComponent( ref component ) );
    }

}