for (int f : fibonacci() | rv::take(10)) std::cout << f << ' ';
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; for (int f : fibonacci() | rv::take(10)) std::cout
If you’re still writing new / delete or raw loops with index variables, . Embrace it. “C++20 feels like a new language – but still C++.” – Bjarne Stroustrup It introduced four major language features and a
// Error: add("a", "b") – string not numeric
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
int main() for (const auto& entry : fs::directory_iterator(".")) auto [path, status] = std::pairentry.path(), entry.status(); if (fs::is_regular_file(status)) std::cout << "File: " << path.filename() << '\n';
