Top 19 New Features of C++17 you need to know about it.

What is c++17?

C++17 (or C++1z) is the informal name for the next revision of the ISO/IEC standard for the C++ programming language after c++14. C++17 is feature complete now and on its way to becoming an international standard. It’s specification reached the Draft International Standard stage in March 2017. Below is Standardization chart of c++.

Standardization Chart of C++17

New Features of C++17

1. Making the text message for static_assert optional
2. Removal of trigraphs
3. Allow type name (as an alternative to class) in a template parameter
4. New rules for auto deduction from braced-init-list
5. Nested namespace definitions, e.g., namespace X::Y { … } instead of namespace X { namespace Y { … }}
6. Allowing attributes for namespaces and enumerators
7. New standard attributes [[fallthrough]], [[maybe_unused]] and [[nodiscard]]
8. UTF-8 character literals
9. Constant evaluation for all non-type template arguments
10. Fold expressions, for variadic templates
11. A compile-time static if with the form if constexpr(expression)
12. Structured binding declarations, allowing auto [a, b] = getTwoReturnValues();
13. Initializers in if and switch statements
14. Guaranteed copy elision by compilers in some cases
15. Some extensions on over-aligned memory allocation
16. Template deduction of constructors, allowing std::pair(5.0, false) instead of std::pair<double,bool>(5.0, false)
17. Inline variables, which allows the definition of variables in header files
18. __has_include, allowing the availability of a header to be checked by preprocessor directives
19. Value of __cplusplus changed to 201703L

Also Read: C++ Where Is It Heading? And What are the New Features in C++ 17