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135 lines
3.9 KiB
HTML
135 lines
3.9 KiB
HTML
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<!DOCTYPE html>
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<html>
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<head>
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<title>Safe switch - Better Enums</title>
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<link rel="canonical" href="http://aantron.github.io/better-enums/tutorial/SafeSwitch.html" />
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<meta name="description" content="Better Enums can be used directly in switch statements like
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normal enums, making it possible for the compiler to check that all cases are
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listed, increasing the safety of your code." />
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<meta name="author" content="Anton Bachin" />
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<link rel="stylesheet" href="../better-enums.css" />
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</head>
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<body class="">
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<nav>
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<div class="container">
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<a class="first" href="https://raw.githubusercontent.com/aantron/better-enums/0.11.3/enum.h"
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download>Download</a>
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<a href="https://github.com/aantron/better-enums">GitHub</a>
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<a href="../index.html">Home</a>
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<a href="../tutorial/HelloWorld.html">Tutorial</a>
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<a href="../ApiReference.html">Reference</a>
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</div>
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</nav>
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<div class="spacer"> </div>
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<header>
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<div class="container">
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<section>
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<h1><a href="../index.html">Better Enums</a></h1>
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<h2>Reflective compile-time enums for <span class="cpp">C++</span></h2>
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<h3>Open-source under the BSD license</h3>
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</section>
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<section class="notes">
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<p>Version 0.11.3</p>
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<p>To install, just add <code>enum.h</code> to your project.</p>
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<p>
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Visit the GitHub repo for issues, feedback, and the latest development.
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</p>
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</section>
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<section class="buttons">
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<a href="https://raw.githubusercontent.com/aantron/better-enums/0.11.3/enum.h"
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download>Download <code>enum.h</code></a>
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<a href="https://github.com/aantron/better-enums">GitHub</a>
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</section>
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</header>
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<div class="main">
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<div class="container">
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<p>
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Welcome to the Better Enums tutorials! The code in this tutorial forms a
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valid program, which you can <a href="https://github.com/aantron/better-enums/blob/0.11.3/example/4-switch.cc">download</a> and play with. The
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program runs as part of the automated test suite.
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</p>
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<h2>Safe switch</h2>
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<p>A Better Enum can be used directly in a <code>switch</code> statement:</p>
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<pre>#include <iostream>
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<em>#include <enum.h></em>
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<em>BETTER_ENUM(Channel, int, Red, Green, Blue)</em>
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int main()
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{
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Channel channel = Channel::Green;
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int n;
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<em>switch </em>(<em>channel</em>) {
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<em>case Channel::Red</em>: n = 13; break;
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<em>case Channel::Green</em>: n = 37; break;
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<em>case Channel::Blue</em>: n = 42; break;
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}</pre><p>If you miss a case or add a redundant one, your compiler should be able to give
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you a warning — try it!</p>
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<p>Note that on msvc, you may need to enable <a href="https://docs.microsoft.com/en-us/cpp/error-messages/compiler-warnings/compiler-warning-level-4-c4062">warning C4062</a>.</p>
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<hr>
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<pre> std::cout << n << std::endl;
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return 0;
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}</pre>
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<section class="tutorial-footer">
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<p class="next">
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Continue to the next tutorial: <a href="../tutorial/Maps.html">Maps</a>
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</p>
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<p class="up">
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Or, return to the
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<a href="../index.html#Tutorial">tutorial index</a>.
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</section>
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</div>
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</div>
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<footer>
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<div class="container">
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Copyright © 2015-2019 Anton Bachin. Released under the BSD 2-clause
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license. See
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<a href="https://github.com/aantron/better-enums/blob/0.11.3/doc/LICENSE">
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LICENSE</a>.
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<br />
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This page is part of the documentation for Better Enums 0.11.3.
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