IFilter.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreTypes.h"
#include "Delegates/Delegate.h"
 
/**
 * A generic interface that represents a Filter of ItemType.
 */
template< typename TItemType >
class IFilter
{
public:
    typedef TItemType ItemType;
 
    virtual ~IFilter(){ }
 
    /** Returns whether the specified Item passes the Filter's restrictions */
    virtual bool PassesFilter( TItemType InItem ) const = 0;
 
    /** Broadcasts anytime the restrictions of the Filter changes */
    DECLARE_EVENT( IFilter<TItemType>, FChangedEvent );
    virtual FChangedEvent& OnChanged() = 0;
};