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ZealOS/docs/Demo/ClassMeta.ZC.html
TomAwezome 48d4f999cb Update documentation.
2021-12-11 06:10:58 -05:00

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<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html;charset=US-ASCII">
<meta name="generator" content="ZealOS V1.07">
<style type="text/css">
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<pre style="font-family:monospace;font-size:12pt">
<a name="l1"></a><span class=cF2>/*Demonstrates class meta data.</span><span class=cF0>
<a name="l2"></a></span><span class=cF2>Basically, we make use of the compiler's</span><span class=cF0>
<a name="l3"></a></span><span class=cF2>data about a class. We can add to the</span><span class=cF0>
<a name="l4"></a></span><span class=cF2>compilers data arbitrary items, either string or</span><span class=cF0>
<a name="l5"></a></span><span class=cF2>or int or F64 (if you typecast).</span><span class=cF0>
<a name="l6"></a>
<a name="l7"></a></span><span class=cF2>This stuff is not high performance.</span><span class=cF0>
<a name="l8"></a></span><span class=cF2>Don't get carried away -- it might be slow.</span><span class=cF0>
<a name="l9"></a></span><span class=cF2>*/</span><span class=cF0>
<a name="l10"></a>
<a name="l11"></a></span><span class=cF1>U0</span><span class=cF0> RankOut(</span><span class=cF9>I64</span><span class=cF0> i)
<a name="l12"></a>{
<a name="l13"></a> </span><span class=cF6>&quot; %z&quot;</span><span class=cF0>, i, </span><span class=cF6>&quot;Cadet\0Ensign\0Captain\0Admiral\0President\0&quot;</span><span class=cF0>;
<a name="l14"></a>}
<a name="l15"></a>
<a name="l16"></a></span><span class=cF1>class</span><span class=cF0> Test1Struct
<a name="l17"></a>{
<a name="l18"></a> </span><span class=cF9>I64</span><span class=cF0> age print_str </span><span class=cF6>&quot;%2d&quot;</span><span class=cF0> default_val </span><span class=cFE>38</span><span class=cF0>;
<a name="l19"></a> </span><span class=cF9>I64</span><span class=cF0> color default_val </span><span class=cF3>RED</span><span class=cF0>; </span><span class=cF2>//Accepts expressions</span><span class=cF0>
<a name="l20"></a> </span><span class=cF9>I64</span><span class=cF0> rank print_str </span><span class=cF6>&quot;%1d&quot;</span><span class=cF0> default_val </span><span class=cFE>6</span><span class=cF0>/</span><span class=cFE>2</span><span class=cF0> output_fun &amp;RankOut;
<a name="l21"></a>};
<a name="l22"></a>
<a name="l23"></a></span><span class=cF1>class</span><span class=cF0> Test2Struct
<a name="l24"></a>{
<a name="l25"></a> </span><span class=cF9>I64</span><span class=cF0> age print_str </span><span class=cF6>&quot;%2d&quot;</span><span class=cF0> default_val </span><span class=cFE>38</span><span class=cF0> percentile </span><span class=cFE>54</span><span class=cF0>.</span><span class=cFE>20</span><span class=cF0>;
<a name="l26"></a> </span><span class=cF9>I64</span><span class=cF0> rank print_str </span><span class=cF6>&quot;%1d&quot;</span><span class=cF0> default_val </span><span class=cFE>5</span><span class=cF0>;
<a name="l27"></a> </span><span class=cF9>I64</span><span class=cF0> serial_num print_str </span><span class=cF6>&quot;%6d&quot;</span><span class=cF0> default_val </span><span class=cFE>123456</span><span class=cF0>;
<a name="l28"></a>};
<a name="l29"></a>
<a name="l30"></a></span><span class=cF1>U0</span><span class=cF0> DumpStruct(</span><span class=cF1>U8</span><span class=cF0> *_d, </span><span class=cF1>U8</span><span class=cF0> *class_name=</span><span class=cF1>lastclass</span><span class=cF0>)
<a name="l31"></a>{</span><span class=cF2>//lastclass is keyword.</span><span class=cF0> </span><span class=cF2>See </span><a href="https://zeal-operating-system.github.io/ZealOS/Demo/LastClass.ZC.html#l1"><span class=cF4>::/Demo/LastClass.ZC</span></a><span class=cF2>.</span><span class=cF0>
<a name="l32"></a> </span><span class=cF9>CHashClass</span><span class=cF0> *tmpc = </span><span class=cF5>HashFind</span><span class=cF0>(class_name, </span><span class=cF5>Fs</span><span class=cF0>-&gt;hash_table, </span><span class=cF3>HTT_CLASS</span><span class=cF0>);
<a name="l33"></a> </span><span class=cF1>U8</span><span class=cF0> *print_str;
<a name="l34"></a> </span><span class=cF9>I64</span><span class=cF0> *q, default_val;
<a name="l35"></a> </span><span class=cF1>U0</span><span class=cF0> (*fp_output_fun)(</span><span class=cF9>I64</span><span class=cF0> i);
<a name="l36"></a> </span><span class=cF1>F64</span><span class=cF0> percentile;
<a name="l37"></a> </span><span class=cF1>if</span><span class=cF0> (!tmpc)
<a name="l38"></a> </span><span class=cF1>return</span><span class=cF0>;
<a name="l39"></a> </span><span class=cF9>CMemberList</span><span class=cF0> *ml;
<a name="l40"></a>
<a name="l41"></a> ml = tmpc-&gt;member_list_and_root;
<a name="l42"></a> </span><span class=cF1>while</span><span class=cF0> (ml)
<a name="l43"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l44"></a> </span><span class=cF6>&quot;%s:&quot;</span><span class=cF0>, ml-&gt;str;
<a name="l45"></a>
<a name="l46"></a> </span><span class=cF2>//All our items are I64's.</span><span class=cF0> </span><span class=cF2>If you want, you can check</span><span class=cF0>
<a name="l47"></a> </span><span class=cF2>//the data type of the member variable. See </span><a href="https://zeal-operating-system.github.io/ZealOS/System/Debug.ZC.html#l216"><span class=cF4>ClassRep</span></a><span class=cF2>().</span><span class=cF0>
<a name="l48"></a> q = _d + ml-&gt;</span><span class=cF1>offset</span><span class=cF0>;
<a name="l49"></a>
<a name="l50"></a> </span><span class=cF1>if</span><span class=cF0> (print_str = </span><span class=cF5>MemberMetaData</span><span class=cF7>(</span><span class=cF6>&quot;print_str&quot;</span><span class=cF0>, ml</span><span class=cF7>)</span><span class=cF0>)
<a name="l51"></a> </span><span class=cF6>&quot;&quot;</span><span class=cF0> print_str, *q;
<a name="l52"></a>
<a name="l53"></a> </span><span class=cF2>//This is slightly ambiguous -- if no meta is present it will return zero.</span><span class=cF0>
<a name="l54"></a> </span><span class=cF1>if</span><span class=cF0> (default_val = </span><span class=cF5>MemberMetaData</span><span class=cF7>(</span><span class=cF6>&quot;default_val&quot;</span><span class=cF0>, ml</span><span class=cF7>)</span><span class=cF0>)
<a name="l55"></a> </span><span class=cF6>&quot; default:%d&quot;</span><span class=cF0>, default_val;
<a name="l56"></a>
<a name="l57"></a> </span><span class=cF2>//This corrects for the ambiguity, allowing zero percentile.</span><span class=cF0>
<a name="l58"></a> </span><span class=cF1>if</span><span class=cF0> (</span><span class=cF5>MemberMetaFind</span><span class=cF7>(</span><span class=cF6>&quot;percentile&quot;</span><span class=cF0>, ml</span><span class=cF7>)</span><span class=cF0>)
<a name="l59"></a> {</span><span class=cF2>//check if it exists</span><span class=cF0>
<a name="l60"></a> </span><span class=cF2>//We could use the </span><a href="https://zeal-operating-system.github.io/ZealOS/Kernel/KernelA.HH.html#l928"><span class=cF4>CMemberListMeta</span></a><span class=cF2> structure returned by</span><span class=cF0>
<a name="l61"></a> </span><span class=cF2>//</span><a href="https://zeal-operating-system.github.io/ZealOS/Compiler/LexLib.ZC.html#l64"><span class=cF4>MemberMetaFind</span></a><span class=cF2>() and save a search.</span><span class=cF0>
<a name="l62"></a> percentile = </span><span class=cF5>MemberMetaData</span><span class=cF0>(</span><span class=cF6>&quot;percentile&quot;</span><span class=cF0>, ml)(</span><span class=cF1>F64</span><span class=cF0>);
<a name="l63"></a> </span><span class=cF6>&quot; percentile: %5.2f&quot;</span><span class=cF0>, percentile;
<a name="l64"></a> }
<a name="l65"></a>
<a name="l66"></a> </span><span class=cF1>if</span><span class=cF0> (fp_output_fun = </span><span class=cF5>MemberMetaData</span><span class=cF7>(</span><span class=cF6>&quot;output_fun&quot;</span><span class=cF0>, ml</span><span class=cF7>)</span><span class=cF0>)
<a name="l67"></a> (*fp_output_fun)(*q);
<a name="l68"></a> </span><span class=cF6>'\n'</span><span class=cF0>;
<a name="l69"></a> ml = ml-&gt;next;
<a name="l70"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l71"></a>}
<a name="l72"></a>
<a name="l73"></a>Test1Struct t1;
<a name="l74"></a>t1.age = </span><span class=cFE>44</span><span class=cF0>;
<a name="l75"></a>t1.rank = </span><span class=cFE>3</span><span class=cF0>;
<a name="l76"></a>
<a name="l77"></a>DumpStruct(&amp;t1);
<a name="l78"></a>
<a name="l79"></a>Test2Struct t2;
<a name="l80"></a>t2.age = </span><span class=cFE>22</span><span class=cF0>;
<a name="l81"></a>t2.rank = </span><span class=cFE>2</span><span class=cF0>;
<a name="l82"></a>t2.serial_num = </span><span class=cFE>55555</span><span class=cF0>;
<a name="l83"></a>
<a name="l84"></a>DumpStruct(&amp;t2);
</span></pre></body>
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