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Duncan P. N. Exon Smith
16e01a193c
Update llvm::sys::fs::mapped_file_region to have a move constructor and a move assignment operator, allowing it to be used as an Optional. Also, update FileOutputBuffer's OnDiskBuffer to take advantage of this, avoiding an extra allocation from the unique_ptr. A nice follow-up would be to make the mapped_file_region constructor private and replace its use with a factory function, such as mapped_file_region::create(), that returns an Expected (or ErrorOr). I don't plan on doing that immediately, but I might swing back later. No functionality change, besides the saved allocation in OnDiskBuffer. Differential Revision: https://reviews.llvm.org/D100159
llvm/lib/Support/Unix README =========================== This directory provides implementations of the lib/System classes that are common to two or more variants of UNIX. For example, the directory structure underneath this directory could look like this: Unix - only code that is truly generic to all UNIX platforms Posix - code that is specific to Posix variants of UNIX SUS - code that is specific to the Single Unix Specification SysV - code that is specific to System V variants of UNIX As a rule, only those directories actually needing to be created should be created. Also, further subdirectories could be created to reflect versions of the various standards. For example, under SUS there could be v1, v2, and v3 subdirectories to reflect the three major versions of SUS.