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<ul class="simple simple-toc" id="toc-list">
<li>
<a class="reference reference-toplevel" href="#12" id="62">Procs</a>
<ul class="simple simple-toc-section">
<ul class="simple nested-toc-section">capLen
<li><a class="reference" href="#capLen%2Cseq%5BT%5D%2CNatural"
title="capLen[T](s: var seq[T]; length: Natural)">capLen[T](s: var seq[T]; length: Natural)</a></li>
</ul>
<ul class="simple nested-toc-section">shortLog
<li><a class="reference" href="#shortLog%2CopenArray%5Bbyte%5D"
title="shortLog(item: openArray[byte]): string">shortLog(item: openArray[byte]): string</a></li>
<li><a class="reference" href="#shortLog%2Cstring"
title="shortLog(item: string): string">shortLog(item: string): string</a></li>
</ul>
</ul>
</li>
<li>
<a class="reference reference-toplevel" href="#17" id="67">Macros</a>
<ul class="simple simple-toc-section">
<ul class="simple nested-toc-section">withValue
<li><a class="reference" href="#withValue.m%2C%2Cuntyped%2Cuntyped%2Cuntyped"
title="withValue[T](self: Opt[T] | Option[T]; value, body, elseStmt: untyped): untyped">withValue[T](self: Opt[T] | Option[T]; value, body, elseStmt: untyped): untyped</a></li>
</ul>
</ul>
</li>
<li>
<a class="reference reference-toplevel" href="#18" id="68">Templates</a>
<ul class="simple simple-toc-section">
<ul class="simple nested-toc-section">compilesOr
<li><a class="reference" href="#compilesOr.t%2Cuntyped%2Cuntyped"
title="compilesOr(a, b: untyped): untyped">compilesOr(a, b: untyped): untyped</a></li>
</ul>
<ul class="simple nested-toc-section">exceptionToAssert
<li><a class="reference" href="#exceptionToAssert.t%2Cuntyped"
title="exceptionToAssert(body: untyped): untyped">exceptionToAssert(body: untyped): untyped</a></li>
</ul>
<ul class="simple nested-toc-section">public
<li><a class="reference" href="#public.t"
title="public()">public()</a></li>
</ul>
<ul class="simple nested-toc-section">safeConvert
<li><a class="reference" href="#safeConvert.t%2CS"
title="safeConvert[T: SomeInteger; S: Ordinal](value: S): T">safeConvert[T: SomeInteger; S: Ordinal](value: S): T</a></li>
</ul>
<ul class="simple nested-toc-section">toOpt
<li><a class="reference" href="#toOpt.t%2CResult%5BT%2CE%5D"
title="toOpt[T, E](self: Result[T, E]): Opt[T]">toOpt[T, E](self: Result[T, E]): Opt[T]</a></li>
</ul>
<ul class="simple nested-toc-section">valueOr
<li><a class="reference" href="#valueOr.t%2COption%5BT%5D%2Cuntyped"
title="valueOr[T](self: Option[T]; body: untyped): untyped">valueOr[T](self: Option[T]; body: untyped): untyped</a></li>
</ul>
<ul class="simple nested-toc-section">withValue
<li><a class="reference" href="#withValue.t%2C%2Cuntyped%2Cuntyped"
title="withValue[T](self: Opt[T] | Option[T]; value, body: untyped): untyped">withValue[T](self: Opt[T] | Option[T]; value, body: untyped): untyped</a></li>
</ul>
</ul>
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</div>
&nbsp;&nbsp;<a
href="https://github.com/status-im/nim-libp2p/tree/p2p-research/libp2p/utility.nim#L1"
class="link-seesrc" target="_blank">Source</a>
&nbsp;&nbsp;<a href="https://github.com/status-im/nim-libp2p/edit/devel/libp2p/utility.nim#L1" class="link-seesrc" target="_blank" >Edit</a>
<div class="nine columns" id="content">
<div id="tocRoot"></div>
<p class="module-desc"></p>
<div class="section" id="12">
<h1><a class="toc-backref" href="#12">Procs</a></h1>
<dl class="item">
<div id="capLen,seq[T],Natural" class="tohide">
<dt><pre><span class="Keyword">proc</span> <a href="#capLen%2Cseq%5BT%5D%2CNatural"><span class="Identifier">capLen</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">]</span><span class="Other">(</span><span class="Identifier">s</span><span class="Other">:</span> <span class="Keyword">var</span> <span class="Identifier">seq</span><span class="Other">[</span><span class="Identifier">T</span><span class="Other">]</span><span class="Other">;</span> <span class="Identifier">length</span><span class="Other">:</span> <span class="Identifier">Natural</span><span class="Other">)</span> {.<span><span class="Other pragmadots">...</span></span><span class="pragmawrap"><span class="Identifier">raises</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span></span>.}</pre></dt>
<dd>
&nbsp;&nbsp;<a
href="https://github.com/status-im/nim-libp2p/tree/p2p-research/libp2p/utility.nim#L73"
class="link-seesrc" target="_blank">Source</a>
&nbsp;&nbsp;<a href="https://github.com/status-im/nim-libp2p/edit/devel/libp2p/utility.nim#L73" class="link-seesrc" target="_blank" >Edit</a>
</dd>
</div>
<div id="shortLog,openArray[byte]" class="tohide">
<dt><pre><span class="Keyword">func</span> <a href="#shortLog%2CopenArray%5Bbyte%5D"><span class="Identifier">shortLog</span></a><span class="Other">(</span><span class="Identifier">item</span><span class="Other">:</span> <span class="Identifier">openArray</span><span class="Other">[</span><span class="Identifier">byte</span><span class="Other">]</span><span class="Other">)</span><span class="Other">:</span> <span class="Identifier">string</span> {.<span><span class="Other pragmadots">...</span></span><span class="pragmawrap"><span class="Identifier">raises</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span><span class="Other">,</span> <span class="Identifier">tags</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span></span>.}</pre></dt>
<dd>
&nbsp;&nbsp;<a
href="https://github.com/status-im/nim-libp2p/tree/p2p-research/libp2p/utility.nim#L28"
class="link-seesrc" target="_blank">Source</a>
&nbsp;&nbsp;<a href="https://github.com/status-im/nim-libp2p/edit/devel/libp2p/utility.nim#L28" class="link-seesrc" target="_blank" >Edit</a>
</dd>
</div>
<div id="shortLog,string" class="tohide">
<dt><pre><span class="Keyword">func</span> <a href="#shortLog%2Cstring"><span class="Identifier">shortLog</span></a><span class="Other">(</span><span class="Identifier">item</span><span class="Other">:</span> <span class="Identifier">string</span><span class="Other">)</span><span class="Other">:</span> <span class="Identifier">string</span> {.<span><span class="Other pragmadots">...</span></span><span class="pragmawrap"><span class="Identifier">raises</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span><span class="Other">,</span> <span class="Identifier">tags</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span></span>.}</pre></dt>
<dd>
&nbsp;&nbsp;<a
href="https://github.com/status-im/nim-libp2p/tree/p2p-research/libp2p/utility.nim#L40"
class="link-seesrc" target="_blank">Source</a>
&nbsp;&nbsp;<a href="https://github.com/status-im/nim-libp2p/edit/devel/libp2p/utility.nim#L40" class="link-seesrc" target="_blank" >Edit</a>
</dd>
</div>
</dl></div>
<div class="section" id="17">
<h1><a class="toc-backref" href="#17">Macros</a></h1>
<dl class="item">
<div id="withValue.m,,untyped,untyped,untyped" class="tohide">
<dt><pre><span class="Keyword">macro</span> <a href="#withValue.m%2C%2Cuntyped%2Cuntyped%2Cuntyped"><span class="Identifier">withValue</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">]</span><span class="Other">(</span><span class="Identifier">self</span><span class="Other">:</span> <span class="Identifier">Opt</span><span class="Other">[</span><span class="Identifier">T</span><span class="Other">]</span> <span class="Operator">|</span> <span class="Identifier">Option</span><span class="Other">[</span><span class="Identifier">T</span><span class="Other">]</span><span class="Other">;</span> <span class="Identifier">value</span><span class="Other">,</span> <span class="Identifier">body</span><span class="Other">,</span> <span class="Identifier">elseStmt</span><span class="Other">:</span> <span class="Identifier">untyped</span><span class="Other">)</span><span class="Other">:</span> <span class="Identifier">untyped</span> {.
<span><span class="Other pragmadots">...</span></span><span class="pragmawrap"><span class="Identifier">raises</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span></span>.}</pre></dt>
<dd>
&nbsp;&nbsp;<a
href="https://github.com/status-im/nim-libp2p/tree/p2p-research/libp2p/utility.nim#L115"
class="link-seesrc" target="_blank">Source</a>
&nbsp;&nbsp;<a href="https://github.com/status-im/nim-libp2p/edit/devel/libp2p/utility.nim#L115" class="link-seesrc" target="_blank" >Edit</a>
</dd>
</div>
</dl></div>
<div class="section" id="18">
<h1><a class="toc-backref" href="#18">Templates</a></h1>
<dl class="item">
<div id="compilesOr.t,untyped,untyped" class="tohide">
<dt><pre><span class="Keyword">template</span> <a href="#compilesOr.t%2Cuntyped%2Cuntyped"><span class="Identifier">compilesOr</span></a><span class="Other">(</span><span class="Identifier">a</span><span class="Other">,</span> <span class="Identifier">b</span><span class="Other">:</span> <span class="Identifier">untyped</span><span class="Other">)</span><span class="Other">:</span> <span class="Identifier">untyped</span></pre></dt>
<dd>
&nbsp;&nbsp;<a
href="https://github.com/status-im/nim-libp2p/tree/p2p-research/libp2p/utility.nim#L22"
class="link-seesrc" target="_blank">Source</a>
&nbsp;&nbsp;<a href="https://github.com/status-im/nim-libp2p/edit/devel/libp2p/utility.nim#L22" class="link-seesrc" target="_blank" >Edit</a>
</dd>
</div>
<div id="exceptionToAssert.t,untyped" class="tohide">
<dt><pre><span class="Keyword">template</span> <a href="#exceptionToAssert.t%2Cuntyped"><span class="Identifier">exceptionToAssert</span></a><span class="Other">(</span><span class="Identifier">body</span><span class="Other">:</span> <span class="Identifier">untyped</span><span class="Other">)</span><span class="Other">:</span> <span class="Identifier">untyped</span></pre></dt>
<dd>
&nbsp;&nbsp;<a
href="https://github.com/status-im/nim-libp2p/tree/p2p-research/libp2p/utility.nim#L77"
class="link-seesrc" target="_blank">Source</a>
&nbsp;&nbsp;<a href="https://github.com/status-im/nim-libp2p/edit/devel/libp2p/utility.nim#L77" class="link-seesrc" target="_blank" >Edit</a>
</dd>
</div>
<div id="public.t" class="tohide">
<dt><pre><span class="Keyword">template</span> <a href="#public.t"><span class="Identifier">public</span></a><span class="Other">(</span><span class="Other">)</span> {.<span class="Identifier">pragma</span>.}</pre></dt>
<dd>
&nbsp;&nbsp;<a
href="https://github.com/status-im/nim-libp2p/tree/p2p-research/libp2p/utility.nim#L17"
class="link-seesrc" target="_blank">Source</a>
&nbsp;&nbsp;<a href="https://github.com/status-im/nim-libp2p/edit/devel/libp2p/utility.nim#L17" class="link-seesrc" target="_blank" >Edit</a>
</dd>
</div>
<div id="safeConvert.t,S" class="tohide">
<dt><pre><span class="Keyword">template</span> <a href="#safeConvert.t%2CS"><span class="Identifier">safeConvert</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">:</span> <span class="Identifier">SomeInteger</span><span class="Other">;</span> <span class="Identifier">S</span><span class="Other">:</span> <span class="Identifier">Ordinal</span><span class="Other">]</span><span class="Other">(</span><span class="Identifier">value</span><span class="Other">:</span> <span class="Identifier">S</span><span class="Other">)</span><span class="Other">:</span> <span class="Identifier">T</span></pre></dt>
<dd>
Converts <tt class="docutils literal"><span class="pre"><span class="Identifier">value</span></span></tt> from S to <tt class="docutils literal"><span class="pre"><span class="Identifier">T</span></span></tt> iff <tt class="docutils literal"><span class="pre"><span class="Identifier">value</span></span></tt> is guaranteed to be preserved.
&nbsp;&nbsp;<a
href="https://github.com/status-im/nim-libp2p/tree/p2p-research/libp2p/utility.nim#L66"
class="link-seesrc" target="_blank">Source</a>
&nbsp;&nbsp;<a href="https://github.com/status-im/nim-libp2p/edit/devel/libp2p/utility.nim#L66" class="link-seesrc" target="_blank" >Edit</a>
</dd>
</div>
<div id="toOpt.t,Result[T,E]" class="tohide">
<dt><pre><span class="Keyword">template</span> <a href="#toOpt.t%2CResult%5BT%2CE%5D"><span class="Identifier">toOpt</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">,</span> <span class="Identifier">E</span><span class="Other">]</span><span class="Other">(</span><span class="Identifier">self</span><span class="Other">:</span> <span class="Identifier">Result</span><span class="Other">[</span><span class="Identifier">T</span><span class="Other">,</span> <span class="Identifier">E</span><span class="Other">]</span><span class="Other">)</span><span class="Other">:</span> <span class="Identifier">Opt</span><span class="Other">[</span><span class="Identifier">T</span><span class="Other">]</span></pre></dt>
<dd>
&nbsp;&nbsp;<a
href="https://github.com/status-im/nim-libp2p/tree/p2p-research/libp2p/utility.nim#L132"
class="link-seesrc" target="_blank">Source</a>
&nbsp;&nbsp;<a href="https://github.com/status-im/nim-libp2p/edit/devel/libp2p/utility.nim#L132" class="link-seesrc" target="_blank" >Edit</a>
</dd>
</div>
<div id="valueOr.t,Option[T],untyped" class="tohide">
<dt><pre><span class="Keyword">template</span> <a href="#valueOr.t%2COption%5BT%5D%2Cuntyped"><span class="Identifier">valueOr</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">]</span><span class="Other">(</span><span class="Identifier">self</span><span class="Other">:</span> <span class="Identifier">Option</span><span class="Other">[</span><span class="Identifier">T</span><span class="Other">]</span><span class="Other">;</span> <span class="Identifier">body</span><span class="Other">:</span> <span class="Identifier">untyped</span><span class="Other">)</span><span class="Other">:</span> <span class="Identifier">untyped</span></pre></dt>
<dd>
&nbsp;&nbsp;<a
href="https://github.com/status-im/nim-libp2p/tree/p2p-research/libp2p/utility.nim#L125"
class="link-seesrc" target="_blank">Source</a>
&nbsp;&nbsp;<a href="https://github.com/status-im/nim-libp2p/edit/devel/libp2p/utility.nim#L125" class="link-seesrc" target="_blank" >Edit</a>
</dd>
</div>
<div id="withValue.t,,untyped,untyped" class="tohide">
<dt><pre><span class="Keyword">template</span> <a href="#withValue.t%2C%2Cuntyped%2Cuntyped"><span class="Identifier">withValue</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">]</span><span class="Other">(</span><span class="Identifier">self</span><span class="Other">:</span> <span class="Identifier">Opt</span><span class="Other">[</span><span class="Identifier">T</span><span class="Other">]</span> <span class="Operator">|</span> <span class="Identifier">Option</span><span class="Other">[</span><span class="Identifier">T</span><span class="Other">]</span><span class="Other">;</span> <span class="Identifier">value</span><span class="Other">,</span> <span class="Identifier">body</span><span class="Other">:</span> <span class="Identifier">untyped</span><span class="Other">)</span><span class="Other">:</span> <span class="Identifier">untyped</span></pre></dt>
<dd>
<p>This template provides a convenient way to work with <tt class="docutils literal"><span class="pre"><span class="Identifier">Option</span></span></tt> types in Nim. It allows you to execute a block of code (<tt class="docutils literal"><span class="pre"><span class="Identifier">body</span></span></tt>) only when the <tt class="docutils literal"><span class="pre"><span class="Identifier">Option</span></span></tt> is not empty.</p>
<p><tt class="docutils literal"><span class="pre"><span class="Identifier">self</span></span></tt> is the <tt class="docutils literal"><span class="pre"><span class="Identifier">Option</span></span></tt> instance being checked. <tt class="docutils literal"><span class="pre"><span class="Identifier">value</span></span></tt> is the variable name to be used within the <tt class="docutils literal"><span class="pre"><span class="Identifier">body</span></span></tt> for the unwrapped value. <tt class="docutils literal"><span class="pre"><span class="Identifier">body</span></span></tt> is a block of code that is executed only if <tt class="docutils literal"><span class="pre"><span class="Identifier">self</span></span></tt> contains a value.</p>
<p>The <tt class="docutils literal"><span class="pre"><span class="Identifier">value</span></span></tt> within <tt class="docutils literal"><span class="pre"><span class="Identifier">body</span></span></tt> is automatically unwrapped from the <tt class="docutils literal"><span class="pre"><span class="Identifier">Option</span></span></tt>, making it simpler to work with without needing explicit checks or unwrapping.</p>
<p>Example:</p>
<p><pre class="listing"><span class="Keyword">let</span> <span class="Identifier">myOpt</span> <span class="Operator">=</span> <span class="Identifier">Opt</span><span class="Operator">.</span><span class="Identifier">some</span><span class="Punctuation">(</span><span class="DecNumber">5</span><span class="Punctuation">)</span>
<span class="Identifier">myOpt</span><span class="Operator">.</span><span class="Identifier">withValue</span><span class="Punctuation">(</span><span class="Identifier">value</span><span class="Punctuation">)</span><span class="Punctuation">:</span>
<span class="Identifier">echo</span> <span class="Identifier">value</span> <span class="Comment"># Will print 5</span>
</pre></p>
<p>Note: This is a template, and it will be inlined at the call site, offering good performance.</p>
&nbsp;&nbsp;<a
href="https://github.com/status-im/nim-libp2p/tree/p2p-research/libp2p/utility.nim#L91"
class="link-seesrc" target="_blank">Source</a>
&nbsp;&nbsp;<a href="https://github.com/status-im/nim-libp2p/edit/devel/libp2p/utility.nim#L91" class="link-seesrc" target="_blank" >Edit</a>
</dd>
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