C++17 STL Cookbook

How it's done...

In this recipe, we create an example class that could suit as a member of a typical header-only library. The target is to give it a static member and instantiate it in a globally available manner using the inline keyword, which would not be possible like this before C++17:

1. The process_monitor class should both contain a static member and be globally accessible itself, which would produce double-defined symbols when included from multiple translation units:

       // foo_lib.hpp               class process_monitor {        public:            static const std::string standard_string                {"some static globally available string"};        };              process_monitor global_process_monitor;

2. If we now include this in multiple .cpp files in order to compile and link them, this ...