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Struct `dmd.root.file.FileMapping`

Encapsulated management of a memory-mapped file.


						
				struct FileMapping(Datum)
				;

Constructors

Name	Description
`this` (filename)	Open `filename` and map it in memory. If `Datum` is `const`, opens for read-only and maps the content in memory; no error is issued if the file does not exist. This makes it easy to treat a non-existing file as empty.

Fields

Name	Type	Description
`data`	`Datum[]`	Memory-mapped array
`handle`	`void`	Handle of underlying file
`name`	`const(char)*`	Name of underlying file, zero-terminated

Methods

Name	Description
`active` ()	Queries whether `this` is currently associated with a file.
`close` ()	Frees resources associated with this mapping. However, it does not deallocate the name. Reinitializes `this` as a fresh object that can be reused.
`discard` ()	Deletes the underlying file and frees all resources associated. Reinitializes `this` as a fresh object that can be reused.
`filename` ()	Returns the zero-terminated file name associated with the mapping. Can be saved beyond the lifetime of `this`.
`length` ()	Queries the length of the file associated with this mapping. If not active, returns 0.
`moveToFile` (filename)	Unconditionally and destructively moves the underlying file to `filename`. If the operation succeds, returns true. Upon failure, prints a message to `stderr` and returns `false`.
`opSlice` ()	Get a slice to the contents of the entire file.
`resize` (size)	Resizes the file and mapping to the specified `size`.

Parameters

Name	Description
Datum	the mapped data type: Use a POD of size 1 for read/write mapping and a `const` version thereof for read-only mapping. Other primitive types should work, but have not been yet tested.

Authors

Walter Bright, http://www.digitalmars.com

License

Boost License 1.0