vimpunk/mio

Health v2 · maintenance only

Flags: no_releases

Adoption not part of the score

1953 stars · 180 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

mio is a cross-platform, header-only C++11 library for memory mapped file IO, serving as a lightweight alternative to Boost.Iostreams' mmap functionality. It supports mapping via file paths or already-open file handles, accepts arbitrary offsets by handling page-boundary alignment internally, and offers both move-only and shared-semantics mapping classes.

Use cases

• memory map a file in C++ without pulling in Boost
• create a memory mapping from an already open file descriptor
• read large files efficiently via mmap in a cross-platform way
• map a region of a file at an arbitrary offset
• use memory mapped IO in a project built with -fno-exceptions
• share a mapping between objects with shared semantics

When to choose

• you need memory mapped file IO in C++ with zero dependencies
• you want to map from an existing file handle or use non-page-aligned offsets
• you want a header-only, MIT-licensed, cross-platform mmap abstraction

When to avoid

• you need buffered or streamed IO rather than memory mapping
• you already depend on Boost and prefer Boost.Iostreams
• you need the library to validate file descriptor access permissions for you

Facets

library · maturity stable

file-system developer-tools files developer-tools cross-platform windows cpp cross-platform memory-mapped-files mmap header-only cpp11 no-dependencies linux macos

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