C++23

C++23 (ISO/IEC 14882:2024) continues the direction of C++20, further refining and extending the four pillars.

Core Features

Feature	Description
std::expected<T,E>	Return value with error type, alternative to exceptions
std::print / std::println	Modern printing, alternative to iostream
std::mdspan	Multidimensional array view
std::generator	Standard coroutine generator implementation
deducing this	Explicit object parameter, eliminates CRTP and redundant code
if consteval	Conditional branching between compile-time and runtime
Multidimensional subscript operator	matrix[i, j] syntax
std::flat_map / flat_set	Containers based on sorted vectors
import std	Import the entire standard library
std::ranges::to	Construct containers from ranges
std::views::zip / zip_transform	Parallel iteration over multiple ranges
std::to_underlying	Convert enum class to underlying type

Highlights

deducing this

struct Widget {
    // C++20 requires two versions (const and non-const)
    // C++23 handles both with one
    template<typename Self>
    auto&& name(this Self&& self) { return std::forward<Self>(self).name_; }
};

std::print

// No need for <iostream>, type-safe unlike printf
std::print("Hello, {}! pi = {:.2f}\n", "world", 3.14159);

import std

// One line replaces all #include
import std;

Compiler Support

Compiler	Support Status
GCC	14+ (partial features)
Clang	18+ (partial features)
MSVC	VS 2022 17.8+ (partial features)

Further Reading

• std::expected
• std::print
• Deducing this