BufferUtil.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include <CoreMinimal.h>
 
namespace BufferUtil
{
 
 
    template<typename T>
    int CountValid(const TArray<T>& Data, const TFunction<bool(T)>& Predicate, int MaxIndex = -1, int StartIndex = 0)
    {
        int StopIndex = (MaxIndex == -1) ? Data.Num() : MaxIndex;
        int NumValid = 0;
        for (int i = StartIndex; i < StopIndex; ++i)
        {
            if (Predicate(Data[i]) == true)
            {
                NumValid++;
            }
        }
        return NumValid;
    }
 
    
    template<typename T>
    int FilterInPlace(TArray<T>& Data, const TFunction<bool(T)>& Predicate, int MaxIndex = -1, int StartIndex = 0) 
    {
        int StopIndex = (MaxIndex == -1) ? Data.Num() : MaxIndex;
        int StoreIndex = StartIndex;
        for (int i = StartIndex; i < StopIndex; ++i)
        {
            if (Predicate(Data[i]) == true)
            {
                Data[StoreIndex++] = Data[i];
            }
        }
        return StoreIndex;
    }
 
 
 
    template<typename T, typename EnumerableType>
    void AppendElements(TArray<T>& AppendTo, EnumerableType Enumerable)
    {
        for ( T value : Enumerable )
        {
            AppendTo.Add(value);
        }
    }
 
}