◆ FileMemRegions() [2/2]

FileMemRegions	(	const Position< n > &	filePosition,
		const Region< n > &	memoryRegion = `Region<n>::whole()`
	)

Create a mapping from an in-file position and an in-memory region.

The shape of the in-file region is deduced from that of the in-memory region. This constructor is not marked explicit, which allows casting from a Position.