/*! \brief
* Creates a copy of the histogram with double the bin width.
*
+ * \param[in] bIntegerBins If `true`, the first bin in the result will
+ * cover the first bin from the source. Otherwise, the first bin
+ * will cover first two bins from the source.
* \throws std::bad_alloc if out of memory.
*
* The caller is responsible of deleting the returned object.