Copy.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreTypes.h"
#include "Algo/Common.h"
 
namespace Algo
{
    /**
     * Conditionally copies a range into a container
     *
     * @param  Input  Any iterable type
     * @param  Output  Container to hold the output
     * @param  Predicate  Condition which returns true for elements that should be copied and false for elements that should be skipped
     */
    template <typename InT, typename OutT, typename PredicateT>
    FORCEINLINE void CopyIf(const InT& Input, OutT& Output, PredicateT Predicate)
    {
        for (const auto& Value : Input)
        {
            if (Invoke(Predicate, Value))
            {
                Output.Add(Value);
            }
        }
    }
 
    /**
     * Copies a range into a container
     *
     * @param  Input  Any iterable type
     * @param  Output  Container to hold the output
     */
    template <typename InT, typename OutT>
    FORCEINLINE void Copy(const InT& Input, OutT& Output)
    {
        for (const auto& Value : Input)
        {
            Output.Add(Value);
        }
    }
 
    /**
     * Copies a range into a container.
     * Should be used if when the input iterator doesn't return a reference.
     *
     * @param  Input  Any iterable type
     * @param  Output  Container to hold the output
     */
    template <typename InT, typename OutT>
    FORCEINLINE void Copy(const InT& Input, OutT& Output, ENoRef NoRef)
    {
        for (const auto Value : Input)
        {
            Output.Add(Value);
        }
    }
}