[Boost-users] [Interprocess] [file_mapping] is there any way to avoid writing a modified file to disc?

Hi, I'm using file_mapping/mapped_region with Boost 1.45. My idea was to load the memory mapped file in read/write mode and then decrypt the file content in-place (to avoid copying the entire file content). However, this will save a decrypted file :-( Is there any way to avoid the file being saved after in-memory manipulation? -Thorsten