ForEach.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreTypes.h"
#include "Templates/Invoke.h"
 
namespace Algo
{
    /**
     * Conditionally invokes a callable to each element in a range
     *
     * @param  Input      Any iterable type
     * @param  Predicate  Condition which returns true for elements that should be called with and false for elements that should be skipped
     * @param  Callable   Callable object
     */
    template <typename InT, typename PredicateT, typename CallableT>
    FORCEINLINE void ForEachIf(InT& Input, PredicateT Predicate, CallableT Callable)
    {
        for (auto& Value : Input)
        {
            if (Invoke(Predicate, Value))
            {
                Invoke(Callable, Value);
            }
        }
    }
 
    /**
     * Invokes a callable to each element in a range
     *
     * @param  Input      Any iterable type
     * @param  Callable   Callable object
     */
    template <typename InT, typename CallableT>
    FORCEINLINE void ForEach(InT& Input, CallableT Callable)
    {
        for (auto& Value : Input)
        {
            Invoke(Callable, Value);
        }
    }
}