Method clear

deps/opencv/modules/core/src/matrix.cpp:1684–1696

}

void _OutputArray::clear() const
{
    int k = kind();

    if( k == MAT )
    {
        CV_Assert(!fixedSize());
        ((Mat*)obj)->resize(0);
        return;
    }

    release();
}

bool _OutputArray::needed() const
{