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<h1>Module <a href="type_Std_internal.Typerep.html">Std_internal.Typerep</a></h1>
<pre><span class="keyword">module</span> Typerep: <code class="code">sig</code> <a href="Std_internal.Typerep.html">..</a> <code class="code">end</code></pre><div class="info module top">
runtime type representations<br>
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<pre><code><span id="TYPEt"><span class="keyword">type</span> <code class="type">'_</code> t</span> = </code></pre><table class="typetable">
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<code><span class="keyword">|</span></code></td>
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<code><span id="TYPEELTt.Int"><span class="constructor">Int</span></span> <span class="keyword">:</span> <code class="type">int <a href="Std_internal.Typerep.html#TYPEt">t</a></code></code></td>
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<code><span class="keyword">|</span></code></td>
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<code><span id="TYPEELTt.Int32"><span class="constructor">Int32</span></span> <span class="keyword">:</span> <code class="type">int32 <a href="Std_internal.Typerep.html#TYPEt">t</a></code></code></td>
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<code><span class="keyword">|</span></code></td>
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<code><span id="TYPEELTt.Int64"><span class="constructor">Int64</span></span> <span class="keyword">:</span> <code class="type">int64 <a href="Std_internal.Typerep.html#TYPEt">t</a></code></code></td>
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<code><span class="keyword">|</span></code></td>
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<code><span id="TYPEELTt.Nativeint"><span class="constructor">Nativeint</span></span> <span class="keyword">:</span> <code class="type">nativeint <a href="Std_internal.Typerep.html#TYPEt">t</a></code></code></td>
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<code><span class="keyword">|</span></code></td>
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<code><span id="TYPEELTt.Char"><span class="constructor">Char</span></span> <span class="keyword">:</span> <code class="type">char <a href="Std_internal.Typerep.html#TYPEt">t</a></code></code></td>
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<code><span class="keyword">|</span></code></td>
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<code><span id="TYPEELTt.Float"><span class="constructor">Float</span></span> <span class="keyword">:</span> <code class="type">float <a href="Std_internal.Typerep.html#TYPEt">t</a></code></code></td>
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<code><span class="keyword">|</span></code></td>
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<code><span id="TYPEELTt.String"><span class="constructor">String</span></span> <span class="keyword">:</span> <code class="type">string <a href="Std_internal.Typerep.html#TYPEt">t</a></code></code></td>
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<code><span class="keyword">|</span></code></td>
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<code><span id="TYPEELTt.Bool"><span class="constructor">Bool</span></span> <span class="keyword">:</span> <code class="type">bool <a href="Std_internal.Typerep.html#TYPEt">t</a></code></code></td>
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<code><span class="keyword">|</span></code></td>
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<code><span id="TYPEELTt.Unit"><span class="constructor">Unit</span></span> <span class="keyword">:</span> <code class="type">unit <a href="Std_internal.Typerep.html#TYPEt">t</a></code></code></td>
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<code><span class="keyword">|</span></code></td>
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<code><span id="TYPEELTt.Option"><span class="constructor">Option</span></span> <span class="keyword">:</span> <code class="type">'a <a href="Std_internal.Typerep.html#TYPEt">t</a></code> <span class="keyword">-></span> <code class="type">'a option <a href="Std_internal.Typerep.html#TYPEt">t</a></code></code></td>
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<code><span class="keyword">|</span></code></td>
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<code><span id="TYPEELTt.List"><span class="constructor">List</span></span> <span class="keyword">:</span> <code class="type">'a0 <a href="Std_internal.Typerep.html#TYPEt">t</a></code> <span class="keyword">-></span> <code class="type">'a0 list <a href="Std_internal.Typerep.html#TYPEt">t</a></code></code></td>
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<code><span class="keyword">|</span></code></td>
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<code><span id="TYPEELTt.Array"><span class="constructor">Array</span></span> <span class="keyword">:</span> <code class="type">'a1 <a href="Std_internal.Typerep.html#TYPEt">t</a></code> <span class="keyword">-></span> <code class="type">'a1 array <a href="Std_internal.Typerep.html#TYPEt">t</a></code></code></td>
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<code><span class="keyword">|</span></code></td>
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<code><span id="TYPEELTt.Lazy"><span class="constructor">Lazy</span></span> <span class="keyword">:</span> <code class="type">'a2 <a href="Std_internal.Typerep.html#TYPEt">t</a></code> <span class="keyword">-></span> <code class="type">'a2 Lazy.t <a href="Std_internal.Typerep.html#TYPEt">t</a></code></code></td>
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<code><span class="keyword">|</span></code></td>
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<code><span id="TYPEELTt.Ref"><span class="constructor">Ref</span></span> <span class="keyword">:</span> <code class="type">'a3 <a href="Std_internal.Typerep.html#TYPEt">t</a></code> <span class="keyword">-></span> <code class="type">'a3 Pervasives.ref <a href="Std_internal.Typerep.html#TYPEt">t</a></code></code></td>
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<code><span class="keyword">|</span></code></td>
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<code><span id="TYPEELTt.Function"><span class="constructor">Function</span></span> <span class="keyword">:</span> <code class="type">('dom <a href="Std_internal.Typerep.html#TYPEt">t</a> * 'rng <a href="Std_internal.Typerep.html#TYPEt">t</a>)</code> <span class="keyword">-></span> <code class="type">('dom -> 'rng) <a href="Std_internal.Typerep.html#TYPEt">t</a></code></code></td>
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<code><span class="keyword">|</span></code></td>
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<code><span id="TYPEELTt.Tuple"><span class="constructor">Tuple</span></span> <span class="keyword">:</span> <code class="type">'a4 <a href="Std_internal.Typerep.Tuple.html#TYPEt">Tuple.t</a></code> <span class="keyword">-></span> <code class="type">'a4 <a href="Std_internal.Typerep.html#TYPEt">t</a></code></code></td>
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<code><span class="keyword">|</span></code></td>
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<code><span id="TYPEELTt.Record"><span class="constructor">Record</span></span> <span class="keyword">:</span> <code class="type">'a5 Record.t</code> <span class="keyword">-></span> <code class="type">'a5 <a href="Std_internal.Typerep.html#TYPEt">t</a></code></code></td>
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<code><span class="keyword">|</span></code></td>
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<code><span id="TYPEELTt.Variant"><span class="constructor">Variant</span></span> <span class="keyword">:</span> <code class="type">'a6 Variant.t</code> <span class="keyword">-></span> <code class="type">'a6 <a href="Std_internal.Typerep.html#TYPEt">t</a></code></code></td>
<td class="typefieldcomment" align="left" valign="top" ><code>(*</code></td><td class="typefieldcomment" align="left" valign="top" ><div class="info ">
The <code class="code">Named</code> constructor both allows for custom implementations of generics
based on name and provides a way to represent recursive types, the lazy
part dealing with cycles<br>
</div>
</td><td class="typefieldcomment" align="left" valign="bottom" ><code>*)</code></td>
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<code><span id="TYPEELTt.Named"><span class="constructor">Named</span></span> <span class="keyword">:</span> <code class="type">('a7 <a href="Std_internal.Typerep.Named.html#TYPEt">Named.t</a> * 'a7 <a href="Std_internal.Typerep.html#TYPEt">t</a> Lazy.t option)</code> <span class="keyword">-></span> <code class="type">'a7 <a href="Std_internal.Typerep.html#TYPEt">t</a></code></code></td>
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<pre><code><span id="TYPEpacked"><span class="keyword">type</span> <code class="type"></code>packed</span> = </code></pre><table class="typetable">
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<code><span id="TYPEELTpacked.T"><span class="constructor">T</span></span> <span class="keyword">:</span> <code class="type">'a <a href="Std_internal.Typerep.html#TYPEt">t</a></code> <span class="keyword">-></span> <code class="type"><a href="Std_internal.Typerep.html#TYPEpacked">packed</a></code></code></td>
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<pre><span class="keyword">module</span> <a href="Std_internal.Typerep.Named.html">Named</a>: <code class="code">sig</code> <a href="Std_internal.Typerep.Named.html">..</a> <code class="code">end</code></pre>
<pre><span class="keyword">module</span> <a href="Std_internal.Typerep.Tuple.html">Tuple</a>: <code class="code">sig</code> <a href="Std_internal.Typerep.Tuple.html">..</a> <code class="code">end</code></pre>
<pre><span class="keyword">include</span> <a href="Variant_and_record_intf.S.html">Variant_and_record_intf.S</a></pre>
<pre><span id="VALsame"><span class="keyword">val</span> same</span> : <code class="type">'a <a href="Std_internal.Typerep.html#TYPEt">t</a> -> 'b <a href="Std_internal.Typerep.html#TYPEt">t</a> -> bool</code></pre><div class="info ">
<code class="code">same t t'</code> will return a proof a equality if <code class="code">t</code> and <code class="code">t'</code> are the same type.
One can think of two types being the <code class="code">same</code> as two types whose values could be for
example put in a list together.
It is worth noting that this function *does not* operate compatiblity diffs between
two different types with the same structure. Example:
<pre class="codepre"><code class="code"> module M1 = struct
type t = {
a : int;
b : float;
} with typerep
end
module M2 = struct
type t = {
a : int;
b : float;
} with typerep
end
TEST = not (same M1.typerep_of_t M2.typerep_of_t)
type a = int with typerep
type b = int with typerep
TEST = same typerep_of_a typerep_of_b
</code></pre>
This is meant to recover type equality hidden by existential constructors.
For a deeper introspection of the structure, <code class="code">see Type_struct</code>.
<p>
Basically this function does structural equality for everything except variant
types, record types, and named types with no lazy definition exposed. This last case
is about types that are defined <code class="code">with typerep(abstract)</code><br>
</div>
<pre><span id="VALsame_witness"><span class="keyword">val</span> same_witness</span> : <code class="type">'a <a href="Std_internal.Typerep.html#TYPEt">t</a> -><br> 'b <a href="Std_internal.Typerep.html#TYPEt">t</a> -> ('a, 'b) <a href="Type_equal.html#TYPEt">Type_equal.t</a> option</code></pre>
<pre><span id="VALsame_witness_exn"><span class="keyword">val</span> same_witness_exn</span> : <code class="type">'a <a href="Std_internal.Typerep.html#TYPEt">t</a> -><br> 'b <a href="Std_internal.Typerep.html#TYPEt">t</a> -> ('a, 'b) <a href="Type_equal.html#TYPEt">Type_equal.t</a></code></pre>
<pre><span id="VALtypename_of_t"><span class="keyword">val</span> typename_of_t</span> : <code class="type">'a <a href="Std_internal.Typerep.html#TYPEt">t</a> -> 'a <a href="Typename.html#TYPEt">Typename.t</a></code></pre>
<pre><span id="VALhead"><span class="keyword">val</span> head</span> : <code class="type">'a <a href="Std_internal.Typerep.html#TYPEt">t</a> -> 'a <a href="Std_internal.Typerep.html#TYPEt">t</a></code></pre><div class="info ">
<code class="code">head ty</code> is used to traverse the <code class="code">Named</code> constructor. It might be used when one
care to pattern match directly on the representation in a low level way rather than
going through a full generic. <code class="code">head t</code> is <code class="code">t</code> if <code class="code">t</code> is not of the form <code class="code">Named _</code><br>
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