What you need to know about C + + Top 19 new features (with great reviews)

What is C++17?

C++17 (or c++1z) is the informal name of the next revision of the C + + programming language ISO/IEC standard following c++14. C++17 is now fully functional and is on the way to becoming an international standard. Its norm had reached the stage of the draft international standard in March 2017.

C++17 Standardized Charts

Year	C + + Standard	Official name
1998	ISO/IEC 14,882:1998	C++98
2003	ISO/IEC 14,882:2003	c++03
2011	ISO/IEC 14,882:2011	C++11
2014	ISO/IEC 14,882:2014	C++14
2017	Yet to be determined	C++17
By 2020	Yet to be determined	C++20

19 new features of C++17

2. To make Static_assert text information optional

4. Delete trigraphs

6. Allow use of TypeName (as an alternative class) in template parameters

8. New rules from Braced-init-list for automatic derivation

10. The definition of a nested namespace, for example: Use namespace X::y {...} instead of namespace X {namespace Y {...}}

12. Properties that allow namespaces and enumerators

14. New Standard properties: [[[Fallthrough]], [[maybe_unused]] and [[Nodiscard]]

16. UTF-8 character text

18. Constant evaluation of all non-type template parameters

20. Fold Expressions for variable templates

22. A compile-time static if with the form if constexpr (expression)

24. A structured binding declaration that now allows auto [A, b] = Gettworeturnvalues ();

26. Initializers in if and switch statements

28. In some cases, make sure to copy elision through the compiler (guaranteed copy elision by compilers in some cases)

30. Some extensions for aligning memory allocations

32. Template derivation of constructors, allowing std::p Air (5.0, FALSE) instead of std::p air<double,bool> (5.0, FALSE)

34. inline variables, which allow variables to be defined in the header file

36. __has_include, allowing the availability of header files to be checked by preprocessor directives

38. Change the value of __cplusplus to 201703L

From: http://www.masalaanews.com/

Http://www.oschina.net/news/85129/top-19-new-features-of-c17-you-need-to-know

What you need to know about C + + Top 19 new features (with great reviews)