Recently, the ISO C++ Committee officially released the C++ 17 standard, officially known as ISO/IEC 14882:2017.
Based on C++ 11, C++ 17 is designed to make C++ a less bloated and complex programming language that simplifies the everyday use of the language, making it easier for developers to write and maintain code.
C++ 17 is a major update to the C++ language that introduces many new language features:
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Fold expressions: for variable templates
Inline variables: allow variables to be defined in the header file
Variables can be initialized in if and switch statements
Structured Binding: for (auto [key,value] : my_map) {...}
Class Template Argument Deduction: Use pair p{1, 2.0}; instead of pair
In addition, C++ 17 brings other features such as parallel STL, a file system library derived from Boost. As the new key "vocabulary type" in the standard library, std::string_view and std::optional will be widely used as function arguments and return types. This allows developers to write simpler signatures, for example: std::string_view can be used instead of templating on string types; developers can use std::variant and std::any types more in function bodies. As a class member, and used internally.
We have also reported some new features of C++ 17, which can be viewed here.
LLVM's Clang compiler has also changed the "C++1z" in the code to "C++17" (C++17 was formerly known as C++1z). Both GCC and LLVM/Clang effectively provide full C++ 17 support.
For the ongoing C++ 20, it is expected that all functions will be completed within two years (summer 2019).
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