"Include what you use" means this: for every symbol (type, function, variable, or macro) that you use in foo.cc (or foo.cpp), either foo.cc or foo.h should include a .h file that exports the declaration of that symbol. (Similarly, for foo_test.cc, either foo_test.cc or foo.h should do the including.) Obviously symbols defined in foo.cc itself are excluded from this requirement. This puts us in a state where every file includes the headers it needs to declare the symbols that it uses. When every file includes what it uses, then it is possible to edit any file and remove unused headers, without fear of accidentally breaking the upwards dependencies of that file. It also becomes easy to automatically track and update dependencies in the source code. WWW: http://include-what-you-use.org b01902062/git/freebsd-ports-gnome' title='freebsd-ports-gnome Git repository'/> </head> <body> <div id='cgit'><table id='header'> <tr> <td class='logo' rowspan='2'><a href='/~lantw44/cgit/cgit.cgi/'><img src='/~lantw44/cgit-data/cgit.png' alt='cgit logo'/></a></td> <td class='main'><a href='/~lantw44/cgit/cgit.cgi/'>index</a> : <a title='freebsd-ports-gnome' href='/~lantw44/cgit/cgit.cgi/freebsd-ports-gnome/'>freebsd-ports-gnome</a></td><td class='form'><form method='get'> <input type='hidden' name='id' value='aee2f2718de8ff96c9513c8af04936b5f2ed1bd5'/><select name='h' onchange='this.form.submit();'> <option value='cinnamon'>cinnamon</option> <option value='cinnamon-2.8'>cinnamon-2.8</option> <option value='dependabot/npm_and_yarn/devel/electron4/files/bl-1.2.3'>dependabot/npm_and_yarn/devel/electron4/files/bl-1.2.3</option> <option value='dependabot/npm_and_yarn/devel/electron4/files/elliptic-6.5.3'>dependabot/npm_and_yarn/devel/electron4/files/elliptic-6.5.3</option> <option value='dependabot/npm_and_yarn/devel/electron4/files/elliptic-6.5.4'>dependabot/npm_and_yarn/devel/electron4/files/elliptic-6.5.4</option> <option value='dependabot/npm_and_yarn/devel/electron4/files/ini-1.3.7'>dependabot/npm_and_yarn/devel/electron4/files/ini-1.3.7</option> <option value='dependabot/npm_and_yarn/devel/electron4/files/lodash-4.17.19'>dependabot/npm_and_yarn/devel/electron4/files/lodash-4.17.19</option> <option value='dependabot/npm_and_yarn/devel/electron4/files/lodash.merge-4.6.2'>dependabot/npm_and_yarn/devel/electron4/files/lodash.merge-4.6.2</option> <option value='dependabot/npm_and_yarn/devel/electron4/files/minimist-1.2.2'>dependabot/npm_and_yarn/devel/electron4/files/minimist-1.2.2</option> <option value='dependabot/npm_and_yarn/devel/electron4/files/minimist-1.2.3'>dependabot/npm_and_yarn/devel/electron4/files/minimist-1.2.3</option> <option value='dependabot/npm_and_yarn/devel/electron4/files/node-fetch-2.6.1'>dependabot/npm_and_yarn/devel/electron4/files/node-fetch-2.6.1</option> <option value='dependabot/npm_and_yarn/devel/electron4/files/serve-10.1.2'>dependabot/npm_and_yarn/devel/electron4/files/serve-10.1.2</option> <option value='dependabot/npm_and_yarn/devel/electron4/files/y18n-3.2.2'>dependabot/npm_and_yarn/devel/electron4/files/y18n-3.2.2</option> <option value='dependabot/npm_and_yarn/devel/electron6/files/elliptic-6.5.3'>dependabot/npm_and_yarn/devel/electron6/files/elliptic-6.5.3</option> <option value='dependabot/npm_and_yarn/devel/electron6/files/elliptic-6.5.4'>dependabot/npm_and_yarn/devel/electron6/files/elliptic-6.5.4</option> <option value='dependabot/npm_and_yarn/devel/electron6/files/ini-1.3.8'>dependabot/npm_and_yarn/devel/electron6/files/ini-1.3.8</option> <option value='dependabot/npm_and_yarn/devel/electron6/files/lodash-4.17.19'>dependabot/npm_and_yarn/devel/electron6/files/lodash-4.17.19</option> <option value='dependabot/npm_and_yarn/devel/electron6/files/lodash.merge-4.6.2'>dependabot/npm_and_yarn/devel/electron6/files/lodash.merge-4.6.2</option> <option value='dependabot/npm_and_yarn/devel/electron6/files/node-fetch-2.6.1'>dependabot/npm_and_yarn/devel/electron6/files/node-fetch-2.6.1</option> <option value='dependabot/npm_and_yarn/devel/electron6/files/serve-10.1.2'>dependabot/npm_and_yarn/devel/electron6/files/serve-10.1.2</option> <option value='gnome-3.22'>gnome-3.22</option> <option value='gnome-3.24' selected='selected'>gnome-3.24</option> <option value='gnome-3.26'>gnome-3.26</option> <option value='gnome-3.28'>gnome-3.28</option> <option value='gnome-3.32'>gnome-3.32</option> <option value='gnome-3.36'>gnome-3.36</option> <option value='gstreamer'>gstreamer</option> <option value='gstreamer-1.16'>gstreamer-1.16</option> <option value='gstreamer0.10-removal'>gstreamer0.10-removal</option> <option value='main'>main</option> <option value='master'>master</option> <option value='mate-1.16'>mate-1.16</option> <option value='mate-1.18'>mate-1.18</option> <option value='mate-1.20'>mate-1.20</option> <option value='mate-1.22'>mate-1.22</option> </select> <input type='submit' value='switch'/></form></td></tr> <tr><td class='sub'>FreeBSD GNOME current development ports (https://github.com/freebsd/freebsd-ports-gnome)</td><td class='sub right'></td></tr></table> <table class='tabs'><tr><td> <a href='/~lantw44/cgit/cgit.cgi/freebsd-ports-gnome/about/?h=gnome-3.24'>about</a><a href='/~lantw44/cgit/cgit.cgi/freebsd-ports-gnome/?h=gnome-3.24'>summary</a><a href='/~lantw44/cgit/cgit.cgi/freebsd-ports-gnome/refs/?h=gnome-3.24&id=aee2f2718de8ff96c9513c8af04936b5f2ed1bd5'>refs</a><a class='active' href='/~lantw44/cgit/cgit.cgi/freebsd-ports-gnome/log/mail/xmailwatcher/distinfo?h=gnome-3.24'>log</a><a href='/~lantw44/cgit/cgit.cgi/freebsd-ports-gnome/tree/mail/xmailwatcher/distinfo?h=gnome-3.24&id=aee2f2718de8ff96c9513c8af04936b5f2ed1bd5'>tree</a><a href='/~lantw44/cgit/cgit.cgi/freebsd-ports-gnome/commit/mail/xmailwatcher/distinfo?h=gnome-3.24&id=aee2f2718de8ff96c9513c8af04936b5f2ed1bd5'>commit</a><a href='/~lantw44/cgit/cgit.cgi/freebsd-ports-gnome/diff/mail/xmailwatcher/distinfo?h=gnome-3.24&id=aee2f2718de8ff96c9513c8af04936b5f2ed1bd5'>diff</a><a href='/~lantw44/cgit/cgit.cgi/freebsd-ports-gnome/stats/mail/xmailwatcher/distinfo?h=gnome-3.24'>stats</a></td><td class='form'><form class='right' method='get' action='/~lantw44/cgit/cgit.cgi/freebsd-ports-gnome/log/mail/xmailwatcher/distinfo'> <input type='hidden' name='h' value='gnome-3.24'/><input type='hidden' name='id' value='aee2f2718de8ff96c9513c8af04936b5f2ed1bd5'/><select name='qt'> <option value='grep'>log msg</option> <option value='author'>author</option> <option value='committer'>committer</option> <option value='range'>range</option> </select> <input class='txt' type='search' size='10' name='q' value=''/> <input type='submit' value='search'/> </form> </td></tr></table> <div class='path'>path: <a href='/~lantw44/cgit/cgit.cgi/freebsd-ports-gnome/log/?h=gnome-3.24&id=aee2f2718de8ff96c9513c8af04936b5f2ed1bd5'>root</a>/<a href='/~lantw44/cgit/cgit.cgi/freebsd-ports-gnome/log/mail?h=gnome-3.24&id=aee2f2718de8ff96c9513c8af04936b5f2ed1bd5'>mail</a>/<a href='/~lantw44/cgit/cgit.cgi/freebsd-ports-gnome/log/mail/xmailwatcher?h=gnome-3.24&id=aee2f2718de8ff96c9513c8af04936b5f2ed1bd5'>xmailwatcher</a>/<a href='/~lantw44/cgit/cgit.cgi/freebsd-ports-gnome/log/mail/xmailwatcher/distinfo?h=gnome-3.24&id=aee2f2718de8ff96c9513c8af04936b5f2ed1bd5'>distinfo</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th></th><th class='left'>Commit message (<a href='/~lantw44/cgit/cgit.cgi/freebsd-ports-gnome/log/mail/xmailwatcher/distinfo?h=gnome-3.24&id=aee2f2718de8ff96c9513c8af04936b5f2ed1bd5&showmsg=1'>Expand</a>)</th><th class='left'>Author</th><th class='left'>Age</th><th class='left'>Files</th><th class='left'>Lines</th></tr>