MemStackUtility.h

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// Copyright Epic Games, Inc. All Rights Reserved.
#pragma once
 
#include "CoreMinimal.h"
#include "Misc/MemStack.h"
#include "Misc/StringBuilder.h"
#include "Containers/ArrayView.h"
#include "Containers/StringView.h"
 
namespace UE
{
namespace MemStack
{
 
inline const TCHAR* AllocateString(FMemStackBase& Allocator, const TCHAR* String, int32 Length)
{
    TCHAR* Result = New<TCHAR>(Allocator, Length + 1);
    FMemory::Memcpy(Result, String, Length * sizeof(TCHAR));
    Result[Length] = 0;
    return Result;
}
 
inline const TCHAR* AllocateString(FMemStackBase& Allocator, FStringView String)
{
    return AllocateString(Allocator, String.GetData(), String.Len());
}
 
inline FStringView AllocateStringView(FMemStackBase& Allocator, FStringView String)
{
    return FStringView(AllocateString(Allocator, String), String.Len());
}
 
inline const TCHAR* AllocateString(FMemStackBase& Allocator, const FStringBuilderBase& StringBuilder)
{
    return AllocateString(Allocator, StringBuilder.GetData(), StringBuilder.Len());
}
 
template <typename FormatType, typename... ArgTypes>
inline const TCHAR* AllocateStringf(FMemStackBase& Allocator, const FormatType& Format, ArgTypes... Args)
{
    TStringBuilder<1024> String;
    String.Appendf(Format, Forward<ArgTypes>(Args)...);
    return AllocateString(Allocator, String);
}
 
template <typename FormatType, typename... ArgTypes>
inline FStringView AllocateStringViewf(FMemStackBase& Allocator, const FormatType& Format, ArgTypes... Args)
{
    TStringBuilder<1024> String;
    String.Appendf(Format, Forward<ArgTypes>(Args)...);
    return AllocateStringView(Allocator, String.ToView());
}
 
template<typename T>
inline TArrayView<T> AllocateArrayView(FMemStackBase& Allocator, TArrayView<T> View)
{
    T* Data = nullptr;
    if (View.Num() > 0)
    {
        Data = new(Allocator) T[View.Num()];
        for (int32 i = 0; i < View.Num(); ++i)
        {
            Data[i] = View[i];
        }
    }
    return MakeArrayView(Data, View.Num());
}
 
} // namespace MemStack
} // namespace UE