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| <h1>addFlag method</h1> |
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| <section class="multi-line-signature"> |
| <span class="returntype">void</span> |
| <span class="name ">addFlag</span> |
| (<wbr><span class="parameter" id="addFlag-param-name"><span class="type-annotation">String</span> <span class="parameter-name">name</span>, {</span> <span class="parameter" id="addFlag-param-abbr"><span class="type-annotation">String</span> <span class="parameter-name">abbr</span>, </span> <span class="parameter" id="addFlag-param-help"><span class="type-annotation">String</span> <span class="parameter-name">help</span>, </span> <span class="parameter" id="addFlag-param-defaultsTo"><span class="type-annotation">bool</span> <span class="parameter-name">defaultsTo</span>: <span class="default-value">false</span>, </span> <span class="parameter" id="addFlag-param-negatable"><span class="type-annotation">bool</span> <span class="parameter-name">negatable</span>: <span class="default-value">true</span>, </span> <span class="parameter" id="addFlag-param-callback"><span class="type-annotation">void</span> <span class="parameter-name">callback</span>(<span class="parameter" id="callback-param-value"><span class="type-annotation">bool</span> <span class="parameter-name">value</span></span>), </span> <span class="parameter" id="addFlag-param-hide"><span class="type-annotation">bool</span> <span class="parameter-name">hide</span>: <span class="default-value">false</span></span> }) |
| </section> |
| <section class="desc markdown"> |
| <p>Defines a boolean flag.</p> |
| <p>This adds an <a href="package-args_args/Option-class.html">Option</a> with the given properties to <a href="package-args_args/ArgParser/options.html">options</a>.</p> |
| <p>The <code>abbr</code> argument is a single-character string that can be used as a |
| shorthand for this flag. For example, <code>abbr: "a"</code> will allow the user to |
| pass <code>-a</code> to enable the flag.</p> |
| <p>The <code>help</code> argument is used by <a href="package-args_args/ArgParser/usage.html">usage</a> to describe this flag.</p> |
| <p>The <code>defaultsTo</code> argument indicates the value this flag will have if the |
| user doesn't explicitly pass it in.</p> |
| <p>The <code>negatable</code> argument indicates whether this flag's value can be set to |
| <code>false</code>. For example, if <code>name</code> is <code>flag</code>, the user can pass <code>--no-flag</code> |
| to set its value to <code>false</code>.</p> |
| <p>The <code>callback</code> argument is invoked with the flag's value when the flag |
| is parsed. Note that this makes argument parsing order-dependent in ways |
| that are often surprising, and its use is discouraged in favor of reading |
| values from the <code>ArgResult</code>.</p> |
| <p>If <code>hide</code> is <code>true</code>, this option won't be included in <a href="package-args_args/ArgParser/usage.html">usage</a>.</p> |
| <p>Throws an <code>ArgumentError</code> if:</p><ul><li>There is already an option named <code>name</code>.</li><li>There is already an option using abbreviation <code>abbr</code>.</li></ul> |
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