C++26

C++26 is the informal name for the version of the International Organization for Standardization (ISO) and International Electrotechnical Commission (IEC) 14882 standard for the C++ programming language that follows C++23. The current working draft of this version is N4981.

Features

Changes that have been accepted into C++26 include:

Language

• Unevaluated strings
• Adding @, $, and ` to the basic character set
• constexpr cast from void*
• User-generated static_assert messages
• Placeholder variables with no name
• Pack indexing
• Attributes for structured bindings
• Erroneous behavior for uninitialized reads
• = delete("reason");
• Variadic friends

Library

• Hashing support for std::chrono value classes
• std::is_within_lifetime
• Native handles in file streams
• Interfacing string streams with std::string_view
• Interfacing std::bitset with std::string_view
• More constexpr for <cmath> and <complex>
• Adding the new 2022 SI prefixes on ratios: std::quecto, std::ronto, std::ronna, and std::quetta
• std::copyable_function
• std::submdspan()
• <debugging>: Debugging Support
• <linalg>: A free function linear algebra interface based on the BLAS
• Added tuple protocol to std::complex
• views::concat
• Concatenation of strings and string views
• std::ranges::generate_random
• Printing blank lines with std::println()
• std::formatter<std::filesystem::path>
• Saturation arithmetic with, among others, std::add_sat, std::div_sat

External links

• Compiler support for C++26 features