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<li class="toctree-l1 has-children"><a class="reference internal" href="../../introduction.html">Platform Introduction</a><input class="toctree-checkbox" id="toctree-checkbox-1" name="toctree-checkbox-1" role="switch" type="checkbox"/><label for="toctree-checkbox-1"><div class="visually-hidden">Toggle child pages in navigation</div><i class="icon"><svg><use href="#svg-arrow-right"></use></svg></i></label><ul>
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<li class="toctree-l2"><a class="reference internal" href="../../introduction/languages.html">Programming Languages</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../../introduction/builder.html">GNOME Builder</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../../introduction/flatpak.html">Flatpak</a></li>
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<li class="toctree-l1 current has-children"><a class="reference internal" href="../../guidelines.html">Guidelines</a><input checked="" class="toctree-checkbox" id="toctree-checkbox-3" name="toctree-checkbox-3" role="switch" type="checkbox"/><label for="toctree-checkbox-3"><div class="visually-hidden">Toggle child pages in navigation</div><i class="icon"><svg><use href="#svg-arrow-right"></use></svg></i></label><ul class="current">
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<li class="toctree-l3"><a class="reference internal" href="coding-style.html">C Coding Style</a></li>
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<li class="toctree-l3"><a class="reference internal" href="optimizing.html">Optimizing GNOME Applications</a></li>
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<li class="toctree-l3 current current-page"><a class="current reference internal" href="#">Namespacing</a></li>
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<li class="toctree-l3"><a class="reference internal" href="introspection.html">Introspection</a></li>
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<li class="toctree-l2 has-children"><a class="reference internal" href="../accessibility.html">Accessibility</a><input class="toctree-checkbox" id="toctree-checkbox-5" name="toctree-checkbox-5" role="switch" type="checkbox"/><label for="toctree-checkbox-5"><div class="visually-hidden">Toggle child pages in navigation</div><i class="icon"><svg><use href="#svg-arrow-right"></use></svg></i></label><ul>
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<li class="toctree-l3"><a class="reference internal" href="../accessibility/coding-guidelines.html">Coding Guidelines for Supporting Accessibility</a></li>
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<li class="toctree-l3"><a class="reference internal" href="../accessibility/custom-widgets.html">Making Custom Components Accessible</a></li>
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<li class="toctree-l2 has-children"><a class="reference internal" href="../localization.html">Localization</a><input class="toctree-checkbox" id="toctree-checkbox-6" name="toctree-checkbox-6" role="switch" type="checkbox"/><label for="toctree-checkbox-6"><div class="visually-hidden">Toggle child pages in navigation</div><i class="icon"><svg><use href="#svg-arrow-right"></use></svg></i></label><ul>
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<li class="toctree-l3"><a class="reference internal" href="../localization/practices.html">Best Practices for Localization</a></li>
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<li class="toctree-l2 has-children"><a class="reference internal" href="../maintainer.html">Maintainer Guidelines</a><input class="toctree-checkbox" id="toctree-checkbox-7" name="toctree-checkbox-7" role="switch" type="checkbox"/><label for="toctree-checkbox-7"><div class="visually-hidden">Toggle child pages in navigation</div><i class="icon"><svg><use href="#svg-arrow-right"></use></svg></i></label><ul>
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<li class="toctree-l3"><a class="reference internal" href="../maintainer/api-stability.html">API Stability</a></li>
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<li class="toctree-l3"><a class="reference internal" href="../maintainer/parallel-installability.html">Parallel Installability</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../devel-docs.html">Developer Documentation Style Guidelines</a></li>
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<li class="toctree-l3 has-children"><a class="reference internal" href="../../tutorials/beginners/getting_started.html">Getting Started</a><input class="toctree-checkbox" id="toctree-checkbox-10" name="toctree-checkbox-10" role="switch" type="checkbox"/><label for="toctree-checkbox-10"><div class="visually-hidden">Toggle child pages in navigation</div><i class="icon"><svg><use href="#svg-arrow-right"></use></svg></i></label><ul>
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<li class="toctree-l4"><a class="reference internal" href="../../tutorials/beginners/getting_started/content_view.html">Adding A Content View</a></li>
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<li class="toctree-l4"><a class="reference internal" href="../../tutorials/beginners/getting_started/opening_files.html">Loading Content From A File</a></li>
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<li class="toctree-l4"><a class="reference internal" href="../../tutorials/beginners/getting_started/cursor_position.html">Showing The Cursor Position</a></li>
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<li class="toctree-l4"><a class="reference internal" href="../../tutorials/beginners/getting_started/saving_files.html">Saving The Content To A File</a></li>
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<li class="toctree-l4"><a class="reference internal" href="../../tutorials/beginners/getting_started/saving_state.html">Saving The Application State</a></li>
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<li class="toctree-l4"><a class="reference internal" href="../../tutorials/beginners/getting_started/adding_toasts.html">Notifying The User With Toasts</a></li>
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<li class="toctree-l4"><a class="reference internal" href="../../tutorials/beginners/getting_started/dark_mode.html">Forcing The Dark Color Scheme</a></li>
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<li class="toctree-l3 has-children"><a class="reference internal" href="../../tutorials/beginners/components.html">UI components</a><input class="toctree-checkbox" id="toctree-checkbox-11" name="toctree-checkbox-11" role="switch" type="checkbox"/><label for="toctree-checkbox-11"><div class="visually-hidden">Toggle child pages in navigation</div><i class="icon"><svg><use href="#svg-arrow-right"></use></svg></i></label><ul>
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<li class="toctree-l4"><a class="reference internal" href="../../tutorials/beginners/components/window.html">Windows</a></li>
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<li class="toctree-l4"><a class="reference internal" href="../../tutorials/beginners/components/box.html">Boxes</a></li>
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<li class="toctree-l4"><a class="reference internal" href="../../tutorials/beginners/components/stack.html">Stacks</a></li>
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<li class="toctree-l4"><a class="reference internal" href="../../tutorials/beginners/components/radio_button.html">Radio Buttons</a></li>
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<li class="toctree-l4"><a class="reference internal" href="../../tutorials/beginners/components/spin_button.html">Spin Buttons</a></li>
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<li class="toctree-l4"><a class="reference internal" href="../../tutorials/beginners/components/link_button.html">Link Buttons</a></li>
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|||
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<li class="toctree-l4"><a class="reference internal" href="../../tutorials/beginners/components/switch.html">Switches</a></li>
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<li class="toctree-l4"><a class="reference internal" href="../../tutorials/beginners/components/menu_button.html">Menu Buttons</a></li>
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<li class="toctree-l4"><a class="reference internal" href="../../tutorials/beginners/components/entry.html">Entries</a></li>
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<li class="toctree-l4"><a class="reference internal" href="../../tutorials/beginners/components/password_entry.html">Password Entries</a></li>
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<li class="toctree-l4"><a class="reference internal" href="../../tutorials/beginners/components/message_dialog.html">Messages</a></li>
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<li class="toctree-l4"><a class="reference internal" href="../../tutorials/beginners/components/file_dialog.html">File Dialogs</a></li>
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<li class="toctree-l4"><a class="reference internal" href="../../tutorials/beginners/components/spinner.html">Spinners</a></li>
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<li class="toctree-l4"><a class="reference internal" href="../../tutorials/beginners/components/level_bar.html">Level Bars</a></li>
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</ul>
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|||
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</li>
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|||
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</ul>
|
|||
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</li>
|
|||
|
|
<li class="toctree-l2"><a class="reference internal" href="../../tutorials/application-id.html">Application ID</a></li>
|
|||
|
|
<li class="toctree-l2"><a class="reference internal" href="../../tutorials/application.html">Using GtkApplication</a></li>
|
|||
|
|
<li class="toctree-l2"><a class="reference internal" href="../../tutorials/save-state.html">Saving and Loading Window State</a></li>
|
|||
|
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<li class="toctree-l2"><a class="reference internal" href="../../tutorials/notifications.html">Using Notifications</a></li>
|
|||
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<li class="toctree-l2"><a class="reference internal" href="../../tutorials/themed-icons.html">Themed Icons</a></li>
|
|||
|
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<li class="toctree-l2"><a class="reference internal" href="../../tutorials/deprecations.html">Dealing With Deprecations</a></li>
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|||
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<li class="toctree-l2"><a class="reference internal" href="../../tutorials/actions.html">Actions</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../../tutorials/menus.html">Menus</a></li>
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|||
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<li class="toctree-l2"><a class="reference internal" href="../../tutorials/search-provider.html">Writing a Search Provider</a></li>
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|||
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|
<li class="toctree-l2"><a class="reference internal" href="../../tutorials/pre-and-post-conditions.html">Pre- and Post-Conditions</a></li>
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|||
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<li class="toctree-l2"><a class="reference internal" href="../../tutorials/main-contexts.html">Main Contexts</a></li>
|
|||
|
|
<li class="toctree-l2"><a class="reference internal" href="../../tutorials/lists.html">Using GLib Lists</a></li>
|
|||
|
|
<li class="toctree-l2"><a class="reference internal" href="../../tutorials/threading.html">Threading</a></li>
|
|||
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<li class="toctree-l2"><a class="reference internal" href="../../tutorials/asynchronous-programming.html">Asynchronous Programming</a></li>
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|||
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<li class="toctree-l2"><a class="reference internal" href="../../tutorials/drag-and-drop.html">Drag and Drop</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../../tutorials/widget-templates.html">Widget Templates</a></li>
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</ul>
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</li>
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</ul>
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|||
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|||
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</div>
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|||
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</div>
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|||
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|||
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</div>
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|||
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</div>
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</aside>
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<main class="main">
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<div class="content">
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<article role="main">
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<label class="toc-overlay-icon toc-content-icon no-toc" for="__toc">
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|||
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<i class="icon"><svg><use href="#svg-toc"></use></svg></i>
|
|||
|
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</label>
|
|||
|
|
<section id="namespacing">
|
|||
|
|
<h1>Namespacing<a class="headerlink" href="#namespacing" title="Permalink to this headline">#</a></h1>
|
|||
|
|
<p>Consistent and complete namespacing of symbols (functions and types) and files
|
|||
|
|
is important for two key reasons:</p>
|
|||
|
|
<ol class="arabic simple">
|
|||
|
|
<li><p>Establishing a convention which means developers have to learn fewer symbol
|
|||
|
|
names to use the library — they can guess them reliably instead.</p></li>
|
|||
|
|
<li><p>Ensuring symbols from two projects do not conflict if included in the same
|
|||
|
|
file.</p></li>
|
|||
|
|
</ol>
|
|||
|
|
<p>The second point is important — imagine what would happen if every project
|
|||
|
|
exported a function called <code class="docutils literal notranslate"><span class="pre">create_object()</span></code>. The headers defining them could not
|
|||
|
|
be included in the same file, and even if that were overcome, the programmer
|
|||
|
|
would not know which project each function comes from. Namespacing eliminates
|
|||
|
|
these problems by using a unique, consistent prefix for every symbol and
|
|||
|
|
filename in a project, grouping symbols into their projects and separating them
|
|||
|
|
from others.</p>
|
|||
|
|
<p>The conventions below should be used for namespacing all symbols. They are used
|
|||
|
|
in all GLib-based projects, so should be familiar to a lot of developers:</p>
|
|||
|
|
<ul class="simple">
|
|||
|
|
<li><p>Functions should use <code class="docutils literal notranslate"><span class="pre">lower_case_with_underscores</span></code> (also known as <em>snake
|
|||
|
|
case</em>).</p></li>
|
|||
|
|
<li><p>Structures, types and objects should use <code class="docutils literal notranslate"><span class="pre">CamelCaseWithoutUnderscores</span></code>.</p></li>
|
|||
|
|
<li><p>Macros and constants should use <code class="docutils literal notranslate"><span class="pre">UPPER_CASE_WITH_UNDERSCORES</span></code>.</p></li>
|
|||
|
|
<li><p>All symbols should be prefixed with a short (2–4 characters) version of the
|
|||
|
|
namespace. This is shortened purely for ease of typing, but should still be
|
|||
|
|
unique.</p></li>
|
|||
|
|
<li><p>All methods of a class should also be prefixed with the class name.</p></li>
|
|||
|
|
</ul>
|
|||
|
|
<p>Additionally, public headers should be included from a subdirectory, effectively
|
|||
|
|
namespacing the header files. For example, instead of <code class="docutils literal notranslate"><span class="pre">#include</span> <span class="pre"><abc.h></span></code>, a
|
|||
|
|
project should allow its users to use <code class="docutils literal notranslate"><span class="pre">#include</span> <span class="pre"><namespace/abc.h></span></code>.</p>
|
|||
|
|
<p>Some projects namespace their headers within this subdirectory — for example,
|
|||
|
|
<code class="docutils literal notranslate"><span class="pre">#include</span> <span class="pre"><namespace/ns-abc.h></span></code> instead of <code class="docutils literal notranslate"><span class="pre">#include</span> <span class="pre"><namespace/abc.h></span></code>.
|
|||
|
|
This is redundant, but harmless.</p>
|
|||
|
|
<p>For example, for a project called ‘Walbottle’, the short namespace ‘Wbl’ would
|
|||
|
|
be chosen. If it has a ‘schema’ class and a ‘writer’ class, it would install
|
|||
|
|
headers:</p>
|
|||
|
|
<ul class="simple">
|
|||
|
|
<li><p><code class="docutils literal notranslate"><span class="pre">$(includedir)/walbottle-$API_MAJOR/walbottle/schema.h</span></code></p></li>
|
|||
|
|
<li><p><code class="docutils literal notranslate"><span class="pre">$(includedir)/walbottle-$API_MAJOR/walbottle/writer.h</span></code></p></li>
|
|||
|
|
</ul>
|
|||
|
|
<p>(The use of <code class="docutils literal notranslate"><span class="pre">$API_MAJOR</span></code> above is for parallel installability.)</p>
|
|||
|
|
<p>For the schema class, the following symbols would be exported (amongst others),
|
|||
|
|
following GObject conventions:</p>
|
|||
|
|
<ul class="simple">
|
|||
|
|
<li><p><code class="docutils literal notranslate"><span class="pre">WblSchema</span></code> structure</p></li>
|
|||
|
|
<li><p><code class="docutils literal notranslate"><span class="pre">WblSchemaClass</span></code> structure</p></li>
|
|||
|
|
<li><p><code class="docutils literal notranslate"><span class="pre">WBL_TYPE_SCHEMA</span></code> macro</p></li>
|
|||
|
|
<li><p><code class="docutils literal notranslate"><span class="pre">WBL_IS_SCHEMA</span></code> macro</p></li>
|
|||
|
|
<li><p><code class="docutils literal notranslate"><span class="pre">wbl_schema_get_type</span></code> function</p></li>
|
|||
|
|
<li><p><code class="docutils literal notranslate"><span class="pre">wbl_schema_new</span></code> function</p></li>
|
|||
|
|
<li><p><code class="docutils literal notranslate"><span class="pre">wbl_schema_load_from_data</span></code> function</p></li>
|
|||
|
|
</ul>
|
|||
|
|
</section>
|
|||
|
|
|
|||
|
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</article>
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<footer>
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</div>
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