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<link title="Get" rel="Chapter" href="Get.html"><title>Ocamlnet 4 Reference Manual : Netmcore_hashtbl</title>
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<h1>Module <a href="type_Netmcore_hashtbl.html">Netmcore_hashtbl</a></h1>
<pre><span id="MODULENetmcore_hashtbl"><span class="keyword">module</span> Netmcore_hashtbl</span>: <code class="code">sig</code> <a href="Netmcore_hashtbl.html">..</a> <code class="code">end</code></pre><div class="info module top">
<div class="info-desc">
<p>Shared hashtables</p>
</div>
</div>
<hr width="100%">
<p>This is a shared memory version of <code class="code">Hashtbl</code>. Note that the degree
of parallelization is quite restricted - practically all operations
need to be serialized (with the exception of the "ro" variants).</p>
<pre><span id="TYPEt"><span class="keyword">type</span> <code class="type">('a, 'b, 'h)</code> t</span> </pre>
<div class="info ">
<div class="info-desc">
<p>The type of hash tables from type <code class="code">'a</code> to type <code class="code">'b</code> and a
header of type <code class="code">'h</code></p>
</div>
</div>
<pre><span id="TYPEt_descr"><span class="keyword">type</span> <code class="type">('a, 'b, 'h)</code> t_descr</span> </pre>
<div class="info ">
<div class="info-desc">
<p>The marshallable descriptor of a shared hash table</p>
</div>
</div>
<pre><span id="VALcreate"><span class="keyword">val</span> create</span> : <code class="type"><a href="Netmcore.html#TYPEres_id">Netmcore.res_id</a> -> 'h -> ('a, 'b, 'h) <a href="Netmcore_hashtbl.html#TYPEt">t</a></code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">Hashtbl.create pool h</code> creates a new, empty hash table in <code class="code">pool</code>
with a header <code class="code">h</code>.</p>
</div>
</div>
<pre><span id="VALclear"><span class="keyword">val</span> clear</span> : <code class="type">('a, 'b, 'h) <a href="Netmcore_hashtbl.html#TYPEt">t</a> -> unit</code></pre><div class="info ">
<div class="info-desc">
<p>Empty a hash table.</p>
</div>
</div>
<pre><span id="VALadd"><span class="keyword">val</span> add</span> : <code class="type">('a, 'b, 'h) <a href="Netmcore_hashtbl.html#TYPEt">t</a> -> 'a -> 'b -> unit</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">add tbl x y</code> adds a binding of <code class="code">x</code> to <code class="code">y</code> in table <code class="code">tbl</code>.
Previous bindings for <code class="code">x</code> are not removed, but simply
hidden. That is, after performing <a href="Netmcore_hashtbl.html#VALremove"><code class="code">Netmcore_hashtbl.remove</code></a><code class="code"> tbl x</code>,
the previous binding for <code class="code">x</code>, if any, is restored.
(Same behavior as with association lists.)</p>
</div>
</div>
<pre><span id="VALfind_ro"><span class="keyword">val</span> find_ro</span> : <code class="type">('a, 'b, 'h) <a href="Netmcore_hashtbl.html#TYPEt">t</a> -> 'a -> 'b</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">find_ro tbl x</code> returns the current binding of <code class="code">x</code> in <code class="code">tbl</code>,
or raises <code class="code">Not_found</code> if no such binding exists. If it is possible
that the table is being modified at the same time, this function
can crash. (Suffix "_ro" = for "read-only" hashtables.)</p>
</div>
</div>
<pre><span id="VALfind_p"><span class="keyword">val</span> find_p</span> : <code class="type">('a, 'b, 'h) <a href="Netmcore_hashtbl.html#TYPEt">t</a> -> 'a -> ('b -> 'r) -> 'r</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">find_p tbl x f</code> looks up the current binding of <code class="code">x</code> in <code class="code">tbl</code>,
and calls <code class="code">f</code> with this binding as argument. During the execution
of <code class="code">f</code> the binding is pinned and cannot be garbage-collected.
Raises <code class="code">Not_found</code> if there is no such binding.</p>
</div>
</div>
<pre><span id="VALfind_c"><span class="keyword">val</span> find_c</span> : <code class="type">('a, 'b, 'h) <a href="Netmcore_hashtbl.html#TYPEt">t</a> -> 'a -> 'b</code></pre><div class="info ">
<div class="info-desc">
<p>Like <code class="code">find</code> but returns a copy of the binding in normal RAM</p>
</div>
</div>
<pre><span id="VALfind_all_ro"><span class="keyword">val</span> find_all_ro</span> : <code class="type">('a, 'b, 'h) <a href="Netmcore_hashtbl.html#TYPEt">t</a> -> 'a -> 'b list</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">Hashtbl.find_all tbl x</code> returns the list of all data
associated with <code class="code">x</code> in <code class="code">tbl</code>.
The current binding is returned first, then the previous
bindings, in reverse order of introduction in the table.
If it is possible
that the table is being modified at the same time, this function
can crash. (Suffix "_ro" = for "read-only" hashtables.)</p>
</div>
</div>
<pre><span id="VALfind_all_p"><span class="keyword">val</span> find_all_p</span> : <code class="type">('a, 'b, 'h) <a href="Netmcore_hashtbl.html#TYPEt">t</a> -> 'a -> ('b list -> 'r) -> 'r</code></pre><div class="info ">
<div class="info-desc">
<p>Version of <code class="code">find_all</code> with pinned result</p>
</div>
</div>
<pre><span id="VALfind_all_c"><span class="keyword">val</span> find_all_c</span> : <code class="type">('a, 'b, 'h) <a href="Netmcore_hashtbl.html#TYPEt">t</a> -> 'a -> 'b list</code></pre><div class="info ">
<div class="info-desc">
<p>Version of <code class="code">find_all</code> with copied result</p>
</div>
</div>
<pre><span id="VALmem_ro"><span class="keyword">val</span> mem_ro</span> : <code class="type">('a, 'b, 'h) <a href="Netmcore_hashtbl.html#TYPEt">t</a> -> 'a -> bool</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">Hashtbl.mem tbl x</code> checks if <code class="code">x</code> is bound in <code class="code">tbl</code>. If it is possible
that the table is being modified at the same time, this function
can crash. (Suffix "_ro" = for "read-only" hashtables.)</p>
</div>
</div>
<pre><span id="VALmem"><span class="keyword">val</span> mem</span> : <code class="type">('a, 'b, 'h) <a href="Netmcore_hashtbl.html#TYPEt">t</a> -> 'a -> bool</code></pre><div class="info ">
<div class="info-desc">
<p>Safe version of <code class="code">mem_ro</code> in the presence of parallel modifications.
It is a bit slower, though.</p>
</div>
</div>
<pre><span id="VALremove"><span class="keyword">val</span> remove</span> : <code class="type">('a, 'b, 'h) <a href="Netmcore_hashtbl.html#TYPEt">t</a> -> 'a -> unit</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">Hashtbl.remove tbl x</code> removes the current binding of <code class="code">x</code> in <code class="code">tbl</code>,
restoring the previous binding if it exists.
It does nothing if <code class="code">x</code> is not bound in <code class="code">tbl</code>.</p>
</div>
</div>
<pre><span id="VALreplace"><span class="keyword">val</span> replace</span> : <code class="type">('a, 'b, 'h) <a href="Netmcore_hashtbl.html#TYPEt">t</a> -> 'a -> 'b -> unit</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">Hashtbl.replace tbl x y</code> replaces the current binding of <code class="code">x</code>
in <code class="code">tbl</code> by a binding of <code class="code">x</code> to <code class="code">y</code>. If <code class="code">x</code> is unbound in <code class="code">tbl</code>,
a binding of <code class="code">x</code> to <code class="code">y</code> is added to <code class="code">tbl</code>.
This is functionally equivalent to <code class="code">Hashtbl.remove</code><code class="code"> tbl x</code>
followed by <code class="code">Hashtbl.add</code><code class="code"> tbl x y</code>.</p>
</div>
</div>
<pre><span id="VALiter"><span class="keyword">val</span> iter</span> : <code class="type">('a -> 'b -> unit) -> ('a, 'b, 'h) <a href="Netmcore_hashtbl.html#TYPEt">t</a> -> unit</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">Hashtbl.iter f tbl</code> applies <code class="code">f</code> to all bindings in table <code class="code">tbl</code>.
<code class="code">f</code> receives the key as first argument, and the associated value
as second argument. Each binding is presented exactly once to <code class="code">f</code>.
The order in which the bindings are passed to <code class="code">f</code> is unspecified.
However, if the table contains several bindings for the same key,
they are passed to <code class="code">f</code> in reverse order of introduction, that is,
the most recent binding is passed first.</p>
<p>The table cannot be modified while <code class="code">iter</code> is running. Any attempt
will result in a deadlock.</p>
</div>
</div>
<pre><span id="VALlength"><span class="keyword">val</span> length</span> : <code class="type">('a, 'b, 'h) <a href="Netmcore_hashtbl.html#TYPEt">t</a> -> int</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">Hashtbl.length tbl</code> returns the number of bindings in <code class="code">tbl</code>.
Multiple bindings are counted multiply, so <code class="code">Hashtbl.length</code>
gives the number of times <code class="code">Hashtbl.iter</code> calls its first argument.</p>
</div>
</div>
<pre><span id="VALheader"><span class="keyword">val</span> header</span> : <code class="type">('a, 'b, 'h) <a href="Netmcore_hashtbl.html#TYPEt">t</a> -> 'h</code></pre><div class="info ">
<div class="info-desc">
<p>Returns the header</p>
</div>
</div>
<pre><span id="VALheap"><span class="keyword">val</span> heap</span> : <code class="type">('a, 'b, 'h) <a href="Netmcore_hashtbl.html#TYPEt">t</a> -> Stdlib.Obj.t <a href="Netmcore_heap.html#TYPEheap">Netmcore_heap.heap</a></code></pre><div class="info ">
<div class="info-desc">
<p>Returns the heap backing this data structure</p>
</div>
</div>
<pre><span id="VALdescr_of_hashtbl"><span class="keyword">val</span> descr_of_hashtbl</span> : <code class="type">('a, 'b, 'h) <a href="Netmcore_hashtbl.html#TYPEt">t</a> -> ('a, 'b, 'h) <a href="Netmcore_hashtbl.html#TYPEt_descr">t_descr</a></code></pre><div class="info ">
<div class="info-desc">
<p>Returns the descriptor</p>
</div>
</div>
<pre><span id="VALhashtbl_of_descr"><span class="keyword">val</span> hashtbl_of_descr</span> : <code class="type"><a href="Netmcore.html#TYPEres_id">Netmcore.res_id</a> -><br> ('a, 'b, 'h) <a href="Netmcore_hashtbl.html#TYPEt_descr">t_descr</a> -> ('a, 'b, 'h) <a href="Netmcore_hashtbl.html#TYPEt">t</a></code></pre><div class="info ">
<div class="info-desc">
<p>Look up the hash table for this descriptor</p>
</div>
</div>
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