Alternatives and similar repositories for optional

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

• cor3ntin / rangesnext
  ranges features for c+23 ported to C++20
  ☆76Updated 2 years ago
• jfalcou / kumi
  C++20 Compact Tuple Tools
  ☆57Updated this week
• anthonywilliams / strong_typedef
  A class template that creates a new type that is distinct from the underlying type, but convertible to and from it
  ☆115Updated last year
• MiSo1289 / more_concepts
  A C++20 concepts library, providing container concepts etc.
  ☆84Updated 11 months ago
• brevzin / cpp_proposals
  My WG21 proposals
  ☆63Updated this week
• boostorg / stl_interfaces
  A C++14 and later CRTP template for defining iterators
  ☆75Updated last week
• BobSteagall / wg21
  Various documents and code related to proposals for WG21
  ☆67Updated last year
• jbcoe / value_types
  value types for composite class design - with allocators
  ☆65Updated last week
• bemanproject / beman
  Organization, documentation, etc. for the Beman Project,
  ☆104Updated this week
• josuttis / belleviews
  bel::views - simple and easy view classes for C++
  ☆77Updated 2 years ago
• cppalliance / mrdocs
  MrDocs: A Clang/LLVM tool for building reference documentation from C++ code and javadoc comments.
  ☆124Updated last week
• bemanproject / inplace_vector
  A dynamically-resizable vector with fixed capacity and embedded storage (P0843)
  ☆28Updated last month
• boostorg / parser
  A C++ parser combinator library.
  ☆156Updated last week
• jbcoe / polymorphic_value
  A polymorphic value-type for C++
  ☆228Updated 2 years ago
• ned14 / status-code
  Proposed SG14 status_code for the C++ standard
  ☆69Updated this week
• bemanproject / exemplar
  A Beman Library Exemplar (Template)
  ☆78Updated last month
• bemanproject / execution
  Implementation of the std::execution (P2300, sender/receiver) proposal
  ☆93Updated last week
• bemanproject / utf_view
  Implementation of the UTF transcoding views proposal, P2728
  ☆16Updated this week
• sg16-unicode / sg16-meetings
  SG16 meeting plans and summaries
  ☆16Updated 3 weeks ago
• cmannett85 / arg_router
  C++ command line argument parsing and routing
  ☆52Updated last year
• lefticus / cons_expr
  ☆70Updated 4 months ago
• hanickadot / co_curl
  ☆79Updated 6 months ago
• rollbear / lift
  constexpr C++17 library for simplifying higher order functions in application code
  ☆202Updated 2 years ago
• codeinred / tuplet
  A fast, simple tuple implementation that implements tuple as an aggregate
  ☆223Updated last year
• mpark / wg21
  Framework for Writing C++ Committee Papers
  ☆141Updated 4 months ago
• groundswellaudio / swl-variant
  high performance C++20 implementation of std::variant
  ☆56Updated 8 months ago
• qlibs / di
  C++20 Dependency Injection library
  ☆30Updated 6 months ago
• tcsullivan / ini-config
  C++20 single-header library for embedding INI configs
  ☆60Updated 2 years ago
• bretbrownjr / zerocode
  A C++ library with zero code included
  ☆17Updated last year
• dietmarkuehl / kuhllib
  an experimental standard C++ library
  ☆90Updated last year