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<link title="Index of types" rel=Appendix href="index_types.html">
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<link title="Hstring" rel="Chapter" href="Hstring.html"><title>Smt.Variant</title>
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<center><h1>Module <a href="type_Smt.Variant.html">Smt.Variant</a></h1></center>
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<br>
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<pre><span class="keyword">module</span> Variant: <code class="code">sig</code> <a href="Smt.Variant.html">..</a> <code class="code">end</code></pre><span id="3_Variants"><h3>Variants</h3></span>
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<p>
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The types of symbols (when they are enumerated data types) can be refined
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to substypes of their original type (i.e. a subset of their constructors).<br>
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<hr width="100%">
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<pre><span id="VALinit"><span class="keyword">val</span> init</span> : <code class="type">(<a href="Smt.Symbol.html#TYPEt">Smt.Symbol.t</a> * <a href="Smt.Type.html#TYPEt">Smt.Type.t</a>) list -> unit</code></pre><div class="info">
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<code class="code">init l</code> where <code class="code">l</code> is a list of pairs <code class="code">(s, ty)</code> initializes the
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type (and associated constructors) of each <code class="code">s</code> to its original type <code class="code">ty</code>.
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<p>
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This function must be called with a list of all symbols before
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attempting to refine the types.<br>
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</div>
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<pre><span id="VALclose"><span class="keyword">val</span> close</span> : <code class="type">unit -> unit</code></pre><div class="info">
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<code class="code">close ()</code> will compute the smallest type possible for each symbol.
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<p>
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This function must be called when all information has been added.<br>
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</div>
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<pre><span id="VALassign_constr"><span class="keyword">val</span> assign_constr</span> : <code class="type"><a href="Smt.Symbol.html#TYPEt">Smt.Symbol.t</a> -> <a href="Hstring.html#TYPEt">Hstring.t</a> -> unit</code></pre><div class="info">
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<code class="code">assign_constr s cstr</code> will add the constraint that the constructor
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<code class="code">cstr</code> must be in the type of <code class="code">s</code><br>
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</div>
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<pre><span id="VALassign_var"><span class="keyword">val</span> assign_var</span> : <code class="type"><a href="Smt.Symbol.html#TYPEt">Smt.Symbol.t</a> -> <a href="Smt.Symbol.html#TYPEt">Smt.Symbol.t</a> -> unit</code></pre><div class="info">
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<code class="code">assign_var x y</code> will add the constraint that the type of <code class="code">y</code> is a
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subtype of <code class="code">x</code> (use this function when <code class="code">x := y</code> appear in your
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program<br>
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</div>
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<pre><span id="VALprint"><span class="keyword">val</span> print</span> : <code class="type">unit -> unit</code></pre><div class="info">
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<code class="code">print ()</code> will output the computed refined types on std_err. This
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function is here only for debugging purposes. Use it afer <code class="code">close ()</code>.<br>
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</div>
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<pre><span id="VALget_variants"><span class="keyword">val</span> get_variants</span> : <code class="type"><a href="Smt.Symbol.html#TYPEt">Smt.Symbol.t</a> -> Hstring.HSet.t</code></pre><div class="info">
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<code class="code">get_variants s</code> returns a set of constructors, which is the refined
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type of <code class="code">s</code>.<br>
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</div>
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