C++26#Library

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

• 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.
• constexpr placement new.
• Structured binding declaration as a condition.
• Ordering of constraints involving fold expressions.
• Deleting a pointer to an incomplete type should be ill-formed.
• Structured bindings can introduce a pack.
• Allowing exception throwing in constant-evaluation.
• constexpr structured bindings and references to constexpr variables.
• Oxford variadic comma, i.e. "Deprecate ellipsis parameters without a preceding comma. The syntax (int...) is incompatible with C, detrimental to C++, and easily replaceable with (int, ...)."{{Cite web |title=P3176R1: The Oxford variadic comma |url=https://eisenwave.github.io/cpp-proposals/oxford-variadic-comma.html |access-date=2024-12-09 |website=eisenwave.github.io}}
• Removing deprecated array comparisons.
• Contracts{{Cite web |title=Contract assertions (since C++26) - cppreference.com |url=https://en.cppreference.com/w/cpp/language/contracts |access-date=2025-03-09 |website=en.cppreference.com}}

• 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 and
• Adding the new 2022 SI prefixes on ratios: std::quecto, std::ronto, std::ronna, and std::quetta
• std::copyable_function
• std::submdspan()
• : Debugging Support
• : 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
• Saturation arithmetic with, among others, std::add_sat, std::div_sat

• [https://en.cppreference.com/w/cpp/compiler_support/26 Compiler support for C++26 features]

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