C++ 2017 May 2026
std::map<int, std::string> m = 1, "a"; for (const auto& [key, val] : m) // key = 1, val = "a" std::cout << key << ": " << val << '\n';
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
Compile-time conditional compilation inside templates, discarding non-taken branches entirely. c++ 2017
Allows declaring a variable scoped to the statement.
namespace fs = std::filesystem; for (auto& p : fs::directory_iterator(".")) std::cout << p.path() << '\n'; std::map<int, std::string> m = 1, "a"; for (const
Here’s a detailed technical text covering (officially ISO/IEC 14882:2017), often referred to as C++2017. C++17: A Comprehensive Overview 1. Introduction C++17 is the fifth major revision of the C++ programming language standard, formally published by ISO in December 2017. It succeeded C++14 and preceded C++20. While not as groundbreaking as C++11, C++17 delivered a substantial set of practical features aimed at improving productivity, code clarity, performance, and library usability. It removed several outdated features and continued the evolution toward a safer, more expressive language.
template<auto N> struct Foo ; Foo<42> f1; Foo<'c'> f2; 3.1 std::optional<T> A type-safe wrapper that may or may not hold a value. C++17: A Comprehensive Overview 1
void print(std::string_view sv) std::cout << sv;
std::map<int, std::string> m = 1, "a"; for (const auto& [key, val] : m) // key = 1, val = "a" std::cout << key << ": " << val << '\n';
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
Compile-time conditional compilation inside templates, discarding non-taken branches entirely.
Allows declaring a variable scoped to the statement.
namespace fs = std::filesystem; for (auto& p : fs::directory_iterator(".")) std::cout << p.path() << '\n';
Here’s a detailed technical text covering (officially ISO/IEC 14882:2017), often referred to as C++2017. C++17: A Comprehensive Overview 1. Introduction C++17 is the fifth major revision of the C++ programming language standard, formally published by ISO in December 2017. It succeeded C++14 and preceded C++20. While not as groundbreaking as C++11, C++17 delivered a substantial set of practical features aimed at improving productivity, code clarity, performance, and library usability. It removed several outdated features and continued the evolution toward a safer, more expressive language.
template<auto N> struct Foo ; Foo<42> f1; Foo<'c'> f2; 3.1 std::optional<T> A type-safe wrapper that may or may not hold a value.
void print(std::string_view sv) std::cout << sv;