Function proposition: Add Function lowestBitValue

[Robert42]

We've already got a function highestBitValue

template <typename genIUType>
GLM_FUNC_QUALIFIER genIUType highestBitValue(genIUType Value)
{
    genIUType tmp = Value;
    genIUType result = genIUType(0);
    while(tmp)
    {
        result = (tmp & (~tmp + 1)); // grab lowest bit
        tmp &= ~result; // clear lowest bit
    }
    return result;
}

I think an additional function lowestBitValue might be also useful for users (I needed it when using an bitfield as set, and I wanted to iterate over it)

template <typename genIUType>
GLM_FUNC_QUALIFIER genIUType lowestBitValue(genIUType Value)
{
    return (Value & (~Value + 1)); // grab lowest bit
}

template <typename genIUType>
GLM_FUNC_QUALIFIER genIUType highestBitValue(genIUType Value)
{
    genIUType tmp = Value;
    genIUType result = genIUType(0);
    while(tmp)
    {
        result = lowestBitValue(tmp); // grab lowest bit
        tmp &= ~result; // clear lowest bit
    }
    return result;
}

[Groovounet]

This feature has been added in GLM 0.9.8 for GLM 0.9.8.0 release.

Thanks for reporting,
Christophe