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Asked: 2026-06-11T18:05:37+00:00

In some pieces of code I see something like this: #include <SFML/Graphics.hpp> #include <Qt/qwidget.h>

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In some pieces of code I see something like this:

#include <SFML/Graphics.hpp>
#include <Qt/qwidget.h>

What is the difference with the “/” character compared to including a header like this:

#include <iostream>

I tried googling but I couldn’t find any good results.

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1 Answer

  1. Editorial Team

    Include directives are for including single header files. They essentially replace the directive by the file in question. A header file itself may be part of a library.

    The piece before the / is a directory where the header file is placed, relative to a directory in the include search path used for compilation. Say my compiler knows to search in /usr/include, and all my boost headers are in /usr/include/boost. I can then include boost headers in my code using for example

    #include <boost/some_header.hpp>
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