Custom template type class: strong_typedef

C++ 29 May 2019 466

Start using custom classes instead of build-in one for wrapping existing types and associates with a tag type to define the purpose and which then would make it unique. By wrapping primitive type of var in a unique type for each usage we can therefore eliminate this class of problem.

Declare types, create values and assecc the value with custom `strong_typedef` class definitions. Use it for IDs, Indexes and behavior class properties like `jss::strong_typedef_properties::hashable` or `jss::strong_typedef_properties::comparable` for example.

"One common problem in C++ code is the use of simple types for many things: a std::string might be a filename, a person's name, a SQL query string or a piece of JSON; an int could be a count, an index,..."

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