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B-5-introduction-to-c23

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B.5 — Introduction to C++23

Alex

January 25, 2024, 1:33 pm PST January 17, 2025

What is C++23?

In February of 2023, the ISO (International Organization for Standardization) approved a new version of C++, called C++23.

New improvements in C++23

For your interest, here’s a list of the major changes that C++23 adds. Note that this list is not comprehensive, but rather intended to highlight some of the key changes of interest.

  • Constexpr (e.g. std::abs()), and (6.7 — Relational operators and floating point comparisons).
  • Constexpr std::unique_ptr (no lesson yet).
  • Explicit this parameter (no lesson yet).
  • Fixed-size floating point types (via ) (no lesson yet).
  • Formatted printing functions std::print and std::println (no lesson yet)
  • Literal suffixes for std::size_t and the corresponding signed type (5.2 — Literals).
  • Multidimensional subscript operator[] (Mentioned in lesson 17.13 — Multidimensional std::array).
  • Multidimensional span std::mdspan (17.13 — Multidimensional std::array).
  • Preprocessor directives #elifdef and #elifndef (no lesson yet).
  • Preprocessor directive #warning (no lesson yet).
  • Stacktrace library (no lesson yet)
  • Standard library modules std (and std.compat) (no lesson yet).
  • Static operator() and operator[] (no lesson yet).
  • std::bitset now fully constexpr.
  • std::expected (no lesson yet)
  • std::ranges algorithms starts_with, ends_with, contains (no lesson yet)
  • std::string::contains and std::string_view::contains (no lesson yet)
  • std::to_underlying to get the underlying type of enum (13.6 — Scoped enumerations (enum classes)).
  • std::unreachable() (no lesson yet).
  • Using unknown pointers and references in constant expressions (17.2 — std::array length and indexing).

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C.1The end?](https://www.learncpp.com/cpp-tutorial/appendix-c-the-end/) Back to table of contents [Previous lesson

B.4Introduction to C++20](https://www.learncpp.com/cpp-tutorial/introduction-to-c20/)

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