Alternatives and similar repositories for optional

Users that are interested in optional are comparing it to the libraries listed below

• boostorg / fusion
  Boost.org fusion module
  ☆49Updated 2 weeks ago
• boostorg / utility
  Boost.org utility module
  ☆50Updated last week
• boostorg / type_traits
  Boost.org type_traits module
  ☆64Updated 2 weeks ago
• boostorg / phoenix
  Boost.org phoenix module
  ☆33Updated 2 weeks ago
• viboes / std-make
  C++ generic make factory
  ☆108Updated 6 years ago
• boostorg / concept_check
  Boost.org concept_check module
  ☆21Updated this week
• boostorg / mpl
  Boost.org mpl module
  ☆62Updated this week
• boostorg / variant2
  A never-valueless, strong guarantee implementation of std::variant
  ☆71Updated last week
• boostorg / config
  Boost.org config module
  ☆75Updated last month
• boostorg / poly_collection
  Fast containers of polymorphic objects.
  ☆71Updated last month
• boostorg / range
  Boost.org range module
  ☆46Updated last month
• boostorg / contract
  Contract programming for C++
  ☆41Updated this week
• boostorg / accumulators
  An awesome library from Boost
  ☆26Updated last month
• boostorg / callable_traits
  modern C++ type traits and metafunctions for callable types
  ☆137Updated last month
• boostorg / type_index
  Runtime/Compile time copyable type info.
  ☆27Updated 3 weeks ago
• boostorg / random
  Boost.org random module
  ☆40Updated 2 weeks ago
• taocpp / tuple
  Compile-time-efficient proof-of-concept implementation for std::tuple
  ☆94Updated last month
• boostorg / yap
  A C++14-and-later expression template library
  ☆109Updated last month
• libogonek / ogonek
  A C++11 library for Unicode
  ☆83Updated 6 years ago
• boostorg / qvm
  Boost Quaternions, Vectors, Matrices library
  ☆88Updated last month
• boostorg / date_time
  Boost.org date_time module
  ☆68Updated last month
• boostorg / sync
  ☆19Updated last month
• boostorg / align
  Boost.Align
  ☆15Updated 2 weeks ago
• boostorg / bind
  Boost.org bind module
  ☆29Updated last month
• boostorg / assert
  Boost.Assert
  ☆35Updated 2 weeks ago
• taocpp / sequences
  Variadic templates and std::integer_sequence support library
  ☆112Updated 11 months ago
• boostorg / smart_ptr
  Boost.org smart_ptr module
  ☆111Updated 2 weeks ago
• boostorg / endian
  Boost Endian library
  ☆51Updated 2 weeks ago
• boostorg / container
  STL-like containers from Boost
  ☆116Updated this week
• bruxisma / retain-ptr
  WG21 P0468 implementation of an intrusive smart pointer for C++
  ☆58Updated 6 years ago