g++ -std=c++17 program.cpp clang++ -std=c++17 program.cpp cl /std:c++17 program.cpp # MSVC C++17 is often described as a "quality-of-life" release because it addressed many everyday pain points without introducing radical new paradigms (unlike C++11 or C++20). It made C++ more approachable and efficient, and most codebases quickly adopted its features.
Memory resources for container allocators, enabling custom memory management without recompiling container code. 3.8 std::clamp , std::gcd , std::lcm int x = std::clamp(5, 0, 10); // 5 int g = std::gcd(12, 18); // 6 3.9 Splicing for Maps and Sets Extract and insert nodes from associative containers without reallocation. c++ 2017
std::vector<int> v(1'000'000); std::for_each(std::execution::par, v.begin(), v.end(), [](int& x) x *= 2; ); Portable filesystem operations: paths, directories, permissions, etc. g++ -std=c++17 program
std::map<int, std::string> src1,"a"; std::map<int, std::string> dst; dst.insert(src.extract(1)); Distinct enum class for raw memory representation (no arithmetic). Type-safe union
Type-safe union.
std::variant<int, float, std::string> v = "hello"; std::visit([](auto&& arg) std::cout << arg; , v); Type-erased container for any copyable type.
template <typename T> auto to_string(const T& t) if constexpr (std::is_integral_v<T>) return std::to_string(t); else return std::string(t); // only instantiated if T is not integral