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<div class="title">Parameter Names </div> </div>
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<div class="textblock"><p>As additional meta information it is possible to provide the names of arguments for <a class="el" href="classrttr_1_1method.html">methods</a> or <a class="el" href="classrttr_1_1constructor.html">constructors</a>. This information is then accessible via an object of type <a class="el" href="classrttr_1_1parameter__info.html">parameter_info</a>.</p>
<p>Please take a look at following example:</p>
<div class="fragment"><div class="line"><span class="keyword">using namespace </span><a class="code" href="namespacerttr.html">rttr</a>;</div><div class="line"></div><div class="line"><span class="keywordtype">void</span> set_window_geometry(<span class="keyword">const</span> <span class="keywordtype">char</span>* name, <span class="keywordtype">int</span> w, <span class="keywordtype">int</span> h) {...}</div><div class="line"></div><div class="line"><a class="code" href="registration_8h.html#ac6326400f16225ee15b52eabcaae8130">RTTR_REGISTRATION</a></div><div class="line">{</div><div class="line"> <a class="code" href="classrttr_1_1registration.html#a5da1c6eb947d700681faa7fec0bf23b7">registration::method</a>(<span class="stringliteral">"set_window_geometry"</span>, &set_window_geometry)</div><div class="line"> (</div><div class="line"> <a class="code" href="namespacerttr.html#ab708b3893cbd5a10e8782f3825052ea6">parameter_names</a>(<span class="stringliteral">"window name"</span>, <span class="stringliteral">"width"</span>, <span class="stringliteral">"height"</span>)</div><div class="line"> );</div><div class="line">}</div></div><!-- fragment --><p>The names has to a string literal (i.e. const char*) and provided via the function: <a class="el" href="namespacerttr.html#ab708b3893cbd5a10e8782f3825052ea6">parameter_names()</a>. Place the call in the <code>()</code> operator of the returned <a class="el" href="classrttr_1_1registration_1_1bind.html">bind</a> object. </p><dl class="section remark"><dt>Remarks</dt><dd>It is not possible to provide just one name, when you use this function, you have to provide names for <b>all</b> arguments.</dd></dl>
<p>The function has following synopsis: </p><div class="fragment"><div class="line"><span class="keyword">template</span><<span class="keyword">typename</span>...TArgs></div><div class="line">detail::parameter_names<detail::decay_t<TArgs>...> <a class="code" href="namespacerttr.html#ab708b3893cbd5a10e8782f3825052ea6">parameter_names</a>(TArgs&&...args)</div></div><!-- fragment --><p> The names can be retrieved via the <a class="el" href="classrttr_1_1parameter__info.html">parameter_info</a> class. Take a look at the following example:</p>
<div class="fragment"><div class="line"><span class="keywordtype">int</span> main()</div><div class="line">{</div><div class="line"> method meth = type::get_global_method(<span class="stringliteral">"set_window_geometry"</span>);</div><div class="line"> std::vector<parameter_info> param_list = meth.get_parameter_infos();</div><div class="line"> <span class="keywordflow">for</span> (<span class="keyword">const</span> <span class="keyword">auto</span>& info : param_list)</div><div class="line"> {</div><div class="line"> <span class="comment">// print all names of the parameter types and its position in the paramter list</span></div><div class="line"> std::cout << <span class="stringliteral">" name: '"</span> << info.get_type().get_name() << <span class="stringliteral">"'\n"</span></div><div class="line"> << <span class="stringliteral">"index: "</span> << info.get_index()</div><div class="line"> << std::endl;</div><div class="line"> }</div><div class="line">}</div></div><!-- fragment --><p>Output: </p><pre class="fragment"> name: 'window name'
index: 0
name: 'width'
index: 1
name: 'height'
index: 2
</pre><hr/>
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