Separation of implementation details (aka definitions in foo.cpp) from which versions are actually compiled (in foo-impl.cpp) and declarations (in foo.h). I dislike that most C++ templates are …

There is more information here on how to deal with this problem: Where does Visual Studio look for C++ header files? For me, I followed xflowXen's answer and then at "Include Directories" …

itoa will be faster than the stream equivalent. There are also ways of re-using the string buffer with the itoa method (avoiding heap allocations if you are frequently generating strings. e.g. for …

For a template class, the member functions have to be declared in the header file. You can resolve the issue by defining the member functions inline or right after the class definition in …

You'll need to complete a few actions and gain 15 reputation points before being able to upvote. Upvoting indicates when questions and answers are useful. What's reputation and how do I …

What's the difference between constexpr and const? When can I use only one of them? When can I use both and how should I choose one?

When you compile foop.cpp itself, the compiler emits a foop.obj that contains the executable code for function foo. When you link them together, the compiler sees two definitions for function foo …

see this question implement reading files and splitting strings with c++20.

32 For variables, specifies that the type of the variable that is being declared will be automatically deduced from its initializer. For functions, specifies that the return type is a trailing return type …

I have an int a that needs to be equal to "infinity". This means that if int b = anyValue; a>b is always true. Is there any feature of C++ that could make this possible?