C++2019 May 2026

// 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 c++2019

for (int f : fibonacci() | rv::take(10)) std::cout << f << ' '; // Error: add("a", "b") – string not numeric