<div dir="ltr"><div style="" class="markdown-here-wrapper"><p style="margin:0px 0px 1.2em!important">Hi All,</p>
<p style="margin:0px 0px 1.2em!important">This email is to introduce a naming style I  used in previous project, which I think is elegant and makes the code  more friendly to read.<br>I just want to share this style for discussion and if you think it’s better, we may use this style in OpenBMC projects.</p>
<p style="margin:0px 0px 1.2em!important">In recent reviews I see some comments about the problems and debate on C++ class’s members and function parameters.</p>
<p style="margin:0px 0px 1.2em!important">E.g.</p>
<ol style="margin:1.2em 0px;padding-left:2em">
<li style="margin:0.5em 0px">In generated sdbusplus code, we may happen to use C++’s keywords as  class members, such as <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline">server::Delete::delete</code>. This is address by  <a href="https://gerrit.openbmc-project.xyz/#/c/1481/">https://gerrit.openbmc-project.xyz/#/c/1481/</a></li>
<li style="margin:0.5em 0px">Sometimes we use the same name for a class’s member and function parameter, such as:<pre style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;font-size:1em;line-height:1.2em;margin:1.2em 0px"><code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline;white-space:pre;overflow:auto;border-radius:3px;border:1px solid rgb(204,204,204);padding:0.5em 0.7em;display:block!important;display:block;overflow-x:auto;padding:0.5em;color:rgb(51,51,51);background:rgb(248,248,248) none repeat scroll 0% 0%" class="hljs language-c++"><span style="color:rgb(51,51,51);font-weight:bold" class="hljs-keyword">class</span> Host {
  sdbusplus::bus::bus& bus;
  Host(sdbusplus::bus::bus& bus, ...)
   : bus(bus)
  {...}
};
</code></pre>
This is OK, but some reviewers/readers may feel a bit strange on the code.<br>Some one prefer underscores like <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline">_bus</code> to resolve this issue, some other may feel <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline">bus</code> is just good.</li>
<li style="margin:0.5em 0px">We may want to define a object with the same name as class’s name, such as:<pre style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;font-size:1em;line-height:1.2em;margin:1.2em 0px"><code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline;white-space:pre;overflow:auto;border-radius:3px;border:1px solid rgb(204,204,204);padding:0.5em 0.7em;display:block!important;display:block;overflow-x:auto;padding:0.5em;color:rgb(51,51,51);background:rgb(248,248,248) none repeat scroll 0% 0%" class="hljs language-c++"><span style="color:rgb(51,51,51);font-weight:bold" class="hljs-keyword">class</span> foo {
  ...
};
<span style="color:rgb(153,153,136);font-style:italic" class="hljs-comment">//foo foo; // This does not compile</span>
foo myFoo; <span style="color:rgb(153,153,136);font-style:italic" class="hljs-comment">// We'll have to use a different name</span>
</code></pre>
</li>
<li style="margin:0.5em 0px">During reading the code, sometimes it’s hard to find if a variable is a  local varialbe, or the class’s member, or a constant, such as:<pre style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;font-size:1em;line-height:1.2em;margin:1.2em 0px"><code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline;white-space:pre;overflow:auto;border-radius:3px;border:1px solid rgb(204,204,204);padding:0.5em 0.7em;display:block!important;display:block;overflow-x:auto;padding:0.5em;color:rgb(51,51,51);background:rgb(248,248,248) none repeat scroll 0% 0%" class="hljs language-c++"><span style="color:rgb(51,51,51);font-weight:bold" class="hljs-keyword">class</span> Host {
 std::<span style="color:rgb(0,134,179)" class="hljs-built_in">string</span> somePath;
};
...
<span style="color:rgb(51,51,51);font-weight:bold" class="hljs-keyword">const</span> <span style="color:rgb(51,51,51);font-weight:bold" class="hljs-keyword">char</span>* constPath = <span style="color:rgb(221,17,68)" class="hljs-string">"xxx"</span>;
Host::xxx(<span style="color:rgb(51,51,51);font-weight:bold" class="hljs-keyword">const</span> <span style="color:rgb(51,51,51);font-weight:bold" class="hljs-keyword">char</span>* anotherPath) {
 std::<span style="color:rgb(0,134,179)" class="hljs-built_in">string</span> theThirdPath;
 <span style="color:rgb(153,153,136);font-style:italic" class="hljs-comment">// In this function, how do we tell if xxxPath is a local variable or class's member?</span>
}
</code></pre>
</li>
</ol>
<p style="margin:0px 0px 1.2em!important">The naming style I introduce will address all these “problems”.</p>
<ol style="margin:1.2em 0px;padding-left:2em">
<li style="margin:0.5em 0px">All classes, structs, enums start with “T”, e.g. <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline">TUpperCamelCase</code></li>
<li style="margin:0.5em 0px">All interfaces (with pure virtual functions) starts with “I”, e.g. <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline">IUpperCamelCase</code></li>
<li style="margin:0.5em 0px">All members and functions of a class use <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline">UpperCamelCase</code></li>
<li style="margin:0.5em 0px">All function parameters and local variables uses <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline">lowerCamelCase</code></li>
<li style="margin:0.5em 0px">All const or constexpr uses <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline">ALL_UPPER_CASE</code>, the same for enum’s values.</li>
</ol>
<p style="margin:0px 0px 1.2em!important"><strong>Note:</strong> All these styles apply to application code, if the code is to provide a library like STL, keep STL style.</p>
<p style="margin:0px 0px 1.2em!important">With the above styles, we can see all the above “problems” are resolved:</p>
<ol style="margin:1.2em 0px;padding-left:2em">
<li style="margin:0.5em 0px">Because class members are in <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline">UpperCamelCase</code>, so it will not use C++’s reserved keywords at all;</li>
<li style="margin:0.5em 0px">Because classes are in <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline">TUpperCamelCase</code>, and parameters are in  <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline">lowerCamelCase</code>, we won’t have same names for class members and  function parameters<pre style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;font-size:1em;line-height:1.2em;margin:1.2em 0px"><code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline;white-space:pre;overflow:auto;border-radius:3px;border:1px solid rgb(204,204,204);padding:0.5em 0.7em;display:block!important;display:block;overflow-x:auto;padding:0.5em;color:rgb(51,51,51);background:rgb(248,248,248) none repeat scroll 0% 0%" class="hljs language-c++"><span style="color:rgb(51,51,51);font-weight:bold" class="hljs-keyword">class</span> THost {
 sdbusplus::bus::bus& Bus;
 THost(sdbusplus::bus::bus& bus, ...)
  : Bus(bus)
 {...}
};
</code></pre>
</li>
<li style="margin:0.5em 0px">Because classes are in <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline">TUpperCamelCase</code>, we can always define a variable/member with the name we like:<pre style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;font-size:1em;line-height:1.2em;margin:1.2em 0px"><code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline;white-space:pre;overflow:auto;border-radius:3px;border:1px solid rgb(204,204,204);padding:0.5em 0.7em;display:block!important;display:block;overflow-x:auto;padding:0.5em;color:rgb(51,51,51);background:rgb(248,248,248) none repeat scroll 0% 0%" class="hljs language-c++"><span style="color:rgb(51,51,51);font-weight:bold" class="hljs-keyword">class</span> TFoo {
  ...
};
TFoo Foo; <span style="color:rgb(153,153,136);font-style:italic" class="hljs-comment">// OK for class member</span>
TFoo foo; <span style="color:rgb(153,153,136);font-style:italic" class="hljs-comment">// OK for local variables</span>
</code></pre>
</li>
<li style="margin:0.5em 0px">We can always tell if a variable is a class’s member, or a local variable, or constants, or a function call.<pre style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;font-size:1em;line-height:1.2em;margin:1.2em 0px"><code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline;white-space:pre;overflow:auto;border-radius:3px;border:1px solid rgb(204,204,204);padding:0.5em 0.7em;display:block!important;display:block;overflow-x:auto;padding:0.5em;color:rgb(51,51,51);background:rgb(248,248,248) none repeat scroll 0% 0%" class="hljs language-c++"><span style="color:rgb(51,51,51);font-weight:bold" class="hljs-keyword">class</span> THost {
  std::<span style="color:rgb(0,134,179)" class="hljs-built_in">string</span> SomePath;
  <span style="color:rgb(51,51,51);font-weight:bold" class="hljs-keyword">enum</span> <span style="color:rgb(51,51,51);font-weight:bold" class="hljs-keyword">class</span> TValue {
    ONE,
    TWO,
    THREE
  };
};
...
<span style="color:rgb(51,51,51);font-weight:bold" class="hljs-keyword">const</span> <span style="color:rgb(51,51,51);font-weight:bold" class="hljs-keyword">char</span>* CONST_PATH = <span style="color:rgb(221,17,68)" class="hljs-string">"xxx"</span>;
THost::xxx(<span style="color:rgb(51,51,51);font-weight:bold" class="hljs-keyword">const</span> <span style="color:rgb(51,51,51);font-weight:bold" class="hljs-keyword">char</span>* anotherPath, TFoo* foo) {
  std::<span style="color:rgb(0,134,179)" class="hljs-built_in">string</span> theThirdPath;
  foo->InvokeMethod();
  <span style="color:rgb(153,153,136);font-style:italic" class="hljs-comment">// By reading the code (even with header file), we know:</span>
  <span style="color:rgb(153,153,136);font-style:italic" class="hljs-comment">//</span>
  <span style="color:rgb(153,153,136);font-style:italic" class="hljs-comment">// "SomePath" is class's member as THost::SomePath</span>
  <span style="color:rgb(153,153,136);font-style:italic" class="hljs-comment">// "CONST_PATH" and "ONE/TWO/THREE" are constants</span>
  <span style="color:rgb(153,153,136);font-style:italic" class="hljs-comment">// *anotherPath* and *theThirdPath* are local variables</span>
  <span style="color:rgb(153,153,136);font-style:italic" class="hljs-comment">// "foo->InvokeMethod()" is to call TFoo::InvokeMethod() function</span>
}
</code></pre>
</li>
</ol>
<p style="margin:0px 0px 1.2em!important">I think this style is simple and effective, and it improves readability.<br>What do you think?</p>
<p style="margin:0px 0px 1.2em!important">—<br>BRs,<br>Lei YU</p>
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