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> Unreal Engine API Reference > Runtime > Core > Algo > Algo::IndexOfBy

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Algo::IndexOfBy

Returns the index of the first element in the range whose projection is equal to the given value.

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References

Module	Core
Header	/Engine/Source/Runtime/Core/Public/Algo/IndexOf.h
Include	#include "Algo/IndexOf.h"

Syntax

namespace Algo
{
    template<typename RangeType, typename ValueType, typename ProjectionType>
    auto Algo::IndexOfBy
    (
        RangeType && Range,
        const ValueType & Value,
        ProjectionType Proj
    )
}

Remarks

Returns the index of the first element in the range whose projection is equal to the given value.

Returns

The index of the first element found, or (SizeType)-1 if none was found (where SizeType = decltype(GetNum(Range)))

Parameters

Parameter	Description
Range	The range to search.
Value	The value to search for.
Proj	The projection to apply to the element.

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