fmstream
Read-write access to memory-mapped files on Windows and POSIX systems
fmstream provides an interface to read data from memory-mapped files as input/output streams.
File mapping is the association of a file's contents with a portion of the virtual address space of a process. The system creates a file mapping object (also known as a section object) to maintain this association. A file view is the portion of virtual address space that a process uses to access the file's contents. File mapping allows the process to use both random input and output (I/O) and sequential I/O. ...