C++2019 ((hot)) May 2026

auto result = std::vector1,2,3,4,5 | rv::filter([](int x) return x%2==0; ) | rv::transform([](int x) return x*x; ); // result = 4, 16

Concepts replace SFINAE with readable, checkable template requirements. #include <ranges> #include <vector> namespace rv = std::ranges::views; c++2019

C++17 made everyday C++ cleaner, safer, and more expressive. C++20 is comparable to C++11 in scope. It introduced four major language features and a host of library enhancements. 1. Concepts – Constraints for Templates template<typename T> concept Numeric = std::is_arithmetic_v<T>; template<Numeric T> T add(T a, T b) return a + b; auto result = std::vector1

for (int f : fibonacci() | rv::take(10)) std::cout << f << ' '; 5 | rv::filter([](int x) return x%2==0