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docs: Add C++20 ranges documentation

Browse Source 
This doesn't require any implementation changes, as the existing support
for C++11 ranged for loops automatically makes nodes and node/attribute
range objects work as C++20 ranges.

Fixes #613.
This commit is contained in:
Arseny Kapoulkine 2024-05-19 13:24:34 -07:00
parent f1d8c51ec8
commit 7c66cf7b06
2 changed files with 29 additions and 3 deletions
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14
docs/manual.adoc
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@ -1039,7 +1039,19 @@ While using `children()` makes the intent of the code clear, note that each node
[source]
----
for (pugi::xml_node child: tool)
for (pugi::xml_node child: tool) ...
----
When using C{plus}{plus}20, you can also use nodes as well as objects returned by `children()` and `attributes()` functions as ranges:
[source]
----
auto tf =
tools.children("Tool")
| std::views::filter([](auto node) { return node.attribute("AllowRemote").as_bool(); })
| std::views::reverse;
for (pugi::xml_node tool: tf) ...
----
[[access.iterators]]

18
docs/manual.html
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@ -448,6 +448,7 @@ pre.pygments .tok-c1 { color: #3D7B7B; font-style: italic } /* Comment.Single */
pre.pygments .tok-cs { color: #3D7B7B; font-style: italic } /* Comment.Special */
pre.pygments .tok-gd { color: #A00000 } /* Generic.Deleted */
pre.pygments .tok-ge { font-style: italic } /* Generic.Emph */
pre.pygments .tok-ges { font-weight: bold; font-style: italic } /* Generic.EmphStrong */
pre.pygments .tok-gr { color: #E40000 } /* Generic.Error */
pre.pygments .tok-gh { color: #000080; font-weight: bold } /* Generic.Heading */
pre.pygments .tok-gi { color: #008400 } /* Generic.Inserted */
@ -2300,7 +2301,20 @@ If your C++ compiler supports range-based for-loop (this is a C+&#43
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<pre class="pygments highlight"><code data-lang="c++"><span></span><span class="tok-k">for</span><span class="tok-w"> </span><span class="tok-p">(</span><span class="tok-n">pugi</span><span class="tok-o">::</span><span class="tok-n">xml_node</span><span class="tok-w"> </span><span class="tok-n">child</span><span class="tok-o">:</span><span class="tok-w"> </span><span class="tok-n">tool</span><span class="tok-p">)</span></code></pre>
<pre class="pygments highlight"><code data-lang="c++"><span></span><span class="tok-k">for</span><span class="tok-w"> </span><span class="tok-p">(</span><span class="tok-n">pugi</span><span class="tok-o">::</span><span class="tok-n">xml_node</span><span class="tok-w"> </span><span class="tok-n">child</span><span class="tok-o">:</span><span class="tok-w"> </span><span class="tok-n">tool</span><span class="tok-p">)</span><span class="tok-w"> </span><span class="tok-p">...</span></code></pre>
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<div class="paragraph">
<p>When using C&#43;&#43;20, you can also use nodes as well as objects returned by <code>children()</code> and <code>attributes()</code> functions as ranges:</p>
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<div class="listingblock">
<div class="content">
<pre class="pygments highlight"><code data-lang="c++"><span></span><span class="tok-k">auto</span><span class="tok-w"> </span><span class="tok-n">tf</span><span class="tok-w"> </span><span class="tok-o">=</span>
<span class="tok-w"> </span><span class="tok-n">tools</span><span class="tok-p">.</span><span class="tok-n">children</span><span class="tok-p">(</span><span class="tok-s">&quot;Tool&quot;</span><span class="tok-p">)</span>
<span class="tok-w"> </span><span class="tok-o">|</span><span class="tok-w"> </span><span class="tok-n">std</span><span class="tok-o">::</span><span class="tok-n">views</span><span class="tok-o">::</span><span class="tok-n">filter</span><span class="tok-p">([](</span><span class="tok-k">auto</span><span class="tok-w"> </span><span class="tok-n">node</span><span class="tok-p">)</span><span class="tok-w"> </span><span class="tok-p">{</span><span class="tok-w"> </span><span class="tok-k">return</span><span class="tok-w"> </span><span class="tok-n">node</span><span class="tok-p">.</span><span class="tok-n">attribute</span><span class="tok-p">(</span><span class="tok-s">&quot;AllowRemote&quot;</span><span class="tok-p">).</span><span class="tok-n">as_bool</span><span class="tok-p">();</span><span class="tok-w"> </span><span class="tok-p">})</span>
<span class="tok-w"> </span><span class="tok-o">|</span><span class="tok-w"> </span><span class="tok-n">std</span><span class="tok-o">::</span><span class="tok-n">views</span><span class="tok-o">::</span><span class="tok-n">reverse</span><span class="tok-p">;</span>
<span class="tok-k">for</span><span class="tok-w"> </span><span class="tok-p">(</span><span class="tok-n">pugi</span><span class="tok-o">::</span><span class="tok-n">xml_node</span><span class="tok-w"> </span><span class="tok-n">tool</span><span class="tok-o">:</span><span class="tok-w"> </span><span class="tok-n">tf</span><span class="tok-p">)</span><span class="tok-w"> </span><span class="tok-p">...</span></code></pre>
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@ -6153,7 +6167,7 @@ If exceptions are disabled, then in the event of parsing failure the query is in
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