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A clean and lean reimagining of the C++ standard library

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clean-core

clean-core (cc) is a clean and lean reimagining of the C++ standard library.

Goals

  • significantly faster to compile than std
  • forward declaration for all public types
  • no slower than std
  • safer than std
  • more modular header design (each type can be separately included)
  • convenient interfacing with code using std types
  • removal of unintuitive behavior (e.g. vector<bool> or optional::operator bool)
  • mostly keeping naming scheme and intent of std
  • better debugging support and performance
  • no dependency on exceptions

Requirements / Dependencies

  • a C++17 compiler
  • a few std features (that are hard to otherwise implement)

Allowed std includes

  • <cstring> (1ms, for memcpy)
  • <cstddef> (1ms, for some types)
  • <type_traits> (5-8ms, many not implementable ourselves)
  • <utility> (10-15ms, swap, declval, NOTE: cc has own move and forward)
  • <atomic> (20ms, hard to implement ourselves)

Notable Changes

Changes that were rarely used features that increased implementation cost immensely:

  • no allocators
  • no custom deleters for unique_ptr

Error-prone and unintuitive or suprising features:

  • no specialized vector<bool>
  • no operator bool for optional<T>
  • no operator< for optional<T>

Others:

  • no strong exception support
  • no iterator-pair library, only ranges
  • no unreadable _UglyCase (leaking non-caps macros is a sin)
  • traits types and values are not suffixed with _t or _v
  • no volatile support
  • no unique_ptr<T[]>
  • some interfaces are stricter to prevent easy mistakes

New Features

  • span (strided array view)
  • flat_ containers
  • inline_ types (no heap allocs)
  • customizable low-impact assert
  • internal assertions (optional)
    • bound-checked containers
    • null checks for smart pointer
    • contract checks

TODO

  • big list of comparison between std and cc
    • name of feature/class (e.g. pair)
    • header name of std/cc
    • parse time std/cc
    • preprocessed, significant LOC of std/cc

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