/// <summary>
/// Returns the storage but if its null it initializes a new instance
/// of the command, stores it in storage and returns it.
/// </summary>
/// <param name="storage">The backing storage of the command</param>
/// <param name="execute">The execute method</param>
/// <param name="canExecute">The can execute method</param>
/// <returns></returns>
public static RelayCommandAsync <T> New(ref RelayCommandAsync <T> storage, Func <T, Task> execute, Func <T, bool> canExecute = null)
{
return(storage ?? (storage = new RelayCommandAsync <T>(execute, canExecute)));
}
/// <summary>
/// Returns the storage but if its null it initializes a new instance
/// of the command, stores it in storage and returns it.
/// </summary>
/// <param name="storage">The backing storage of the command</param>
/// <param name="canExecute">The can execute method</param>
/// <param name="execute">The execute method</param>
/// <returns></returns>
public static RelayCommandAsync New(ref RelayCommandAsync storage, Func <bool> canExecute, Func <Task> execute)
{
return(storage ?? (storage = new RelayCommandAsync(execute, canExecute)));
}