Function testToFloat

src/ImathTest/testToFloat.cpp:97–157

}

void
testToFloat ()
{
    std::cout << "running testToFloat" << std::endl;

    constexpr int iMax = (1 << 16);

    //
    // for each 16-bit bit pattern...
    //

    for (unsigned int s = 0; s < iMax; s++)
    {
        half hs (half::FromBits, static_cast<unsigned short> (s));
        assert (hs.bits () == s);

        //
        // cast these bits to a float, using the cast-to-float
        // operator.
        //

        float f = float (hs); // = _toFloat[s]

        //
        // Cast that float back to a half.
        //

        half h = half (f);

        //
        // halfToFloat() above is what generated the _toFloat table.
        // The i value return is the integer bit pattern of the corresponding
        // float.
        //

        half::uif uif;
        uif.i = halfToFloat (s);

        //
        // Equality operators fail for inf and nan, so handle them
        // specially.
        //

        if (isnan (f))
        {
            assert (h.isNan ());
            assert (isnan (uif.f));
        }
        else if (isinf (f))
        {
            assert (h.isInfinity ());
            assert (isinf (uif.f));
        }
        else
        {
            assert (f == uif.f);
        }
    }