Quote Originally Posted by tonnot View Post
Why QT creator does not provide help about it ? (It is not neccesary to answer to this...)
As you said yourself STL is a standard library, it's not part of Qt. If you deploy help for STL in Creator, it will use it and give you proper reference.

I dont understand why I must to use std::----- . What is std ? is there more 'workspaces' ( I dont know how to name it) ?
These are so called "namespaces". Thanks to that if there is a std::string class, it doesn't conflict with a string class from some other library. You don't have to use std:: prefix, you can declare that you are "using namespace std;" and all symbols from the std namespace will be made available in the default namespace. But then you might get some naming conflicts if you use other libraries.

A way to get help for inline help into QT Creator ?
This has already been answered somewhere on this forum.