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<title>libqalculate-0.9.7: DynamicVariable Class Reference</title>
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<h1>DynamicVariable Class Reference</h1><!-- doxytag: class="DynamicVariable" --><!-- doxytag: inherits="KnownVariable" -->Abstract base class for variables with a value which is recalculated when the precision has changed.
<a href="#_details">More...</a>
<p>
<code>#include <Variable.h></code>
<p>
<div class="dynheader">
Inheritance diagram for DynamicVariable:</div>
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<p><center><img src="classDynamicVariable.png" usemap="#DynamicVariable_map" border="0" alt=""></center>
<map name="DynamicVariable_map">
<area href="classKnownVariable.html" alt="KnownVariable" shape="rect" coords="0,112,109,136">
<area href="classVariable.html" alt="Variable" shape="rect" coords="0,56,109,80">
<area href="classExpressionItem.html" alt="ExpressionItem" shape="rect" coords="0,0,109,24">
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<p>
<a href="classDynamicVariable-members.html">List of all members.</a><table border="0" cellpadding="0" cellspacing="0">
<tr><td></td></tr>
<tr><td colspan="2"><br><h2>Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="35b4d36518fac4c1a299a9eba835b004"></a><!-- doxytag: member="DynamicVariable::DynamicVariable" ref="35b4d36518fac4c1a299a9eba835b004" args="(string cat_, string name_, string title_="", bool is_local=false, bool is_builtin=true, bool is_active=true)" -->
</td><td class="memItemRight" valign="bottom"><b>DynamicVariable</b> (string cat_, string name_, string title_="", bool is_local=false, bool is_builtin=true, bool is_active=true)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="3f94060f6912c0d76c69afdb5169e017"></a><!-- doxytag: member="DynamicVariable::DynamicVariable" ref="3f94060f6912c0d76c69afdb5169e017" args="(const DynamicVariable *variable)" -->
</td><td class="memItemRight" valign="bottom"><b>DynamicVariable</b> (const <a class="el" href="classDynamicVariable.html">DynamicVariable</a> *variable)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="ae82cbb0b9594682ae2ed03864eb6511"></a><!-- doxytag: member="DynamicVariable::copy" ref="ae82cbb0b9594682ae2ed03864eb6511" args="() const =0" -->
<a class="el" href="classExpressionItem.html">ExpressionItem</a> * </td><td class="memItemRight" valign="bottom"><b>copy</b> () const =0</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="358774b458a2005855c02516400a69df"></a><!-- doxytag: member="DynamicVariable::set" ref="358774b458a2005855c02516400a69df" args="(const ExpressionItem *item)" -->
void </td><td class="memItemRight" valign="bottom"><b>set</b> (const <a class="el" href="classExpressionItem.html">ExpressionItem</a> *item)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">const <a class="el" href="classMathStructure.html">MathStructure</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="classDynamicVariable.html#09f39a44b6495d9da4a42f826e7243c4">get</a> ()</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classDynamicVariable.html#e449e0df12e0a71de7cbcbdf5794a852">set</a> (const <a class="el" href="classMathStructure.html">MathStructure</a> &o)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classDynamicVariable.html#1c480cef3c985e7ec4ea4d0cbb033706">set</a> (string expression_)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="classDynamicVariable.html#92e15c4e4e4ceef6f8b71740d10e2ebd">calculatedPrecision</a> () const </td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classDynamicVariable.html#3219611453495b5e6125c2da970077ca">representsPositive</a> (bool=false)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="0968cae953608dd0362b8a71c65ec76c"></a><!-- doxytag: member="DynamicVariable::representsNegative" ref="0968cae953608dd0362b8a71c65ec76c" args="(bool=false)" -->
virtual bool </td><td class="memItemRight" valign="bottom"><b>representsNegative</b> (bool=false)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="594b3a9140cbc3e136c1783cbb626800"></a><!-- doxytag: member="DynamicVariable::representsNonNegative" ref="594b3a9140cbc3e136c1783cbb626800" args="(bool=false)" -->
virtual bool </td><td class="memItemRight" valign="bottom"><b>representsNonNegative</b> (bool=false)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="b26665ba0953f3e8d56ea5d815a2fdce"></a><!-- doxytag: member="DynamicVariable::representsNonPositive" ref="b26665ba0953f3e8d56ea5d815a2fdce" args="(bool=false)" -->
virtual bool </td><td class="memItemRight" valign="bottom"><b>representsNonPositive</b> (bool=false)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="aa1024b03d326efe3a2e0a2f4313eb36"></a><!-- doxytag: member="DynamicVariable::representsInteger" ref="aa1024b03d326efe3a2e0a2f4313eb36" args="(bool=false)" -->
virtual bool </td><td class="memItemRight" valign="bottom"><b>representsInteger</b> (bool=false)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="2d09618e7b343ad2fce1f4288423b3a3"></a><!-- doxytag: member="DynamicVariable::representsNumber" ref="2d09618e7b343ad2fce1f4288423b3a3" args="(bool=false)" -->
virtual bool </td><td class="memItemRight" valign="bottom"><b>representsNumber</b> (bool=false)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="5bf4cca7e13b62ffb81f153a9ad010f4"></a><!-- doxytag: member="DynamicVariable::representsRational" ref="5bf4cca7e13b62ffb81f153a9ad010f4" args="(bool=false)" -->
virtual bool </td><td class="memItemRight" valign="bottom"><b>representsRational</b> (bool=false)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="2df72aa14c20b945a094d167e3ef6894"></a><!-- doxytag: member="DynamicVariable::representsReal" ref="2df72aa14c20b945a094d167e3ef6894" args="(bool=false)" -->
virtual bool </td><td class="memItemRight" valign="bottom"><b>representsReal</b> (bool=false)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="892e3530f2ed959ac7fab2907e1a70bf"></a><!-- doxytag: member="DynamicVariable::representsComplex" ref="892e3530f2ed959ac7fab2907e1a70bf" args="(bool=false)" -->
virtual bool </td><td class="memItemRight" valign="bottom"><b>representsComplex</b> (bool=false)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="77fe5d331e6c1746448598861c1e81dd"></a><!-- doxytag: member="DynamicVariable::representsNonZero" ref="77fe5d331e6c1746448598861c1e81dd" args="(bool=false)" -->
virtual bool </td><td class="memItemRight" valign="bottom"><b>representsNonZero</b> (bool=false)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="fde3b4e17ffb4efa45a4f97eeed4358f"></a><!-- doxytag: member="DynamicVariable::representsEven" ref="fde3b4e17ffb4efa45a4f97eeed4358f" args="(bool=false)" -->
virtual bool </td><td class="memItemRight" valign="bottom"><b>representsEven</b> (bool=false)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="d8028f28a3357bccbf4a64af17443730"></a><!-- doxytag: member="DynamicVariable::representsOdd" ref="d8028f28a3357bccbf4a64af17443730" args="(bool=false)" -->
virtual bool </td><td class="memItemRight" valign="bottom"><b>representsOdd</b> (bool=false)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="1da41f550f1a4594fabe7fbdc1b5d58a"></a><!-- doxytag: member="DynamicVariable::representsUndefined" ref="1da41f550f1a4594fabe7fbdc1b5d58a" args="(bool=false, bool=false, bool=false)" -->
virtual bool </td><td class="memItemRight" valign="bottom"><b>representsUndefined</b> (bool=false, bool=false, bool=false)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="840de8903fc3215386868f222ef0fc72"></a><!-- doxytag: member="DynamicVariable::representsBoolean" ref="840de8903fc3215386868f222ef0fc72" args="()" -->
virtual bool </td><td class="memItemRight" valign="bottom"><b>representsBoolean</b> ()</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="96471d4f2defb6817b6d1ee5a42e8ce8"></a><!-- doxytag: member="DynamicVariable::representsNonMatrix" ref="96471d4f2defb6817b6d1ee5a42e8ce8" args="()" -->
virtual bool </td><td class="memItemRight" valign="bottom"><b>representsNonMatrix</b> ()</td></tr>
<tr><td colspan="2"><br><h2>Protected Member Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="b3f104059b5a482a4a0d5cf8841c3b1e"></a><!-- doxytag: member="DynamicVariable::calculate" ref="b3f104059b5a482a4a0d5cf8841c3b1e" args="() const =0" -->
virtual void </td><td class="memItemRight" valign="bottom"><b>calculate</b> () const =0</td></tr>
</table>
<hr><a name="_details"></a><h2>Detailed Description</h2>
Abstract base class for variables with a value which is recalculated when the precision has changed. <hr><h2>Member Function Documentation</h2>
<a class="anchor" name="09f39a44b6495d9da4a42f826e7243c4"></a><!-- doxytag: member="DynamicVariable::get" ref="09f39a44b6495d9da4a42f826e7243c4" args="()" -->
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<td class="memname">const <a class="el" href="classMathStructure.html">MathStructure</a>& DynamicVariable::get </td>
<td>(</td>
<td class="paramname"> </td>
<td> ) </td>
<td width="100%"><code> [virtual]</code></td>
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<p>
Returns the value of the variable. If no value is set or parsed and an expression is set, the expression is parsed and resulting value returned.<p>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>The value of the variable.. </dd></dl>
<p>Reimplemented from <a class="el" href="classKnownVariable.html#f35979ac213868a22044422201f1fd1c">KnownVariable</a>.</p>
</div>
</div><p>
<a class="anchor" name="e449e0df12e0a71de7cbcbdf5794a852"></a><!-- doxytag: member="DynamicVariable::set" ref="e449e0df12e0a71de7cbcbdf5794a852" args="(const MathStructure &o)" -->
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<td class="memname">void DynamicVariable::set </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="classMathStructure.html">MathStructure</a> & </td>
<td class="paramname"> <em>o</em> </td>
<td> ) </td>
<td width="100%"><code> [virtual]</code></td>
</tr>
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<p>
Sets the value of the variable. If expression is set, it is cleared.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>o</em> </td><td>Value. </td></tr>
</table>
</dl>
<p>Reimplemented from <a class="el" href="classKnownVariable.html#b4602f4613094017ecd3dcc7c9989948">KnownVariable</a>.</p>
</div>
</div><p>
<a class="anchor" name="1c480cef3c985e7ec4ea4d0cbb033706"></a><!-- doxytag: member="DynamicVariable::set" ref="1c480cef3c985e7ec4ea4d0cbb033706" args="(string expression_)" -->
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<td class="memname">void DynamicVariable::set </td>
<td>(</td>
<td class="paramtype">string </td>
<td class="paramname"> <em>expression_</em> </td>
<td> ) </td>
<td width="100%"><code> [virtual]</code></td>
</tr>
</table>
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<div class="memdoc">
<p>
Sets the text string expression of the variable. The value is cleared.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>expression_</em> </td><td>Expression. </td></tr>
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</dl>
<p>Reimplemented from <a class="el" href="classKnownVariable.html#8e4025fe1a16385e24ad9662947a538c">KnownVariable</a>.</p>
</div>
</div><p>
<a class="anchor" name="92e15c4e4e4ceef6f8b71740d10e2ebd"></a><!-- doxytag: member="DynamicVariable::calculatedPrecision" ref="92e15c4e4e4ceef6f8b71740d10e2ebd" args="() const " -->
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<td class="memname">int DynamicVariable::calculatedPrecision </td>
<td>(</td>
<td class="paramname"> </td>
<td> ) </td>
<td width="100%"> const</td>
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<div class="memdoc">
<p>
Returns the precision of the calculated value.<p>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>Precision of the calculated value or zero if the value has not yet been calculated. </dd></dl>
</div>
</div><p>
<a class="anchor" name="3219611453495b5e6125c2da970077ca"></a><!-- doxytag: member="DynamicVariable::representsPositive" ref="3219611453495b5e6125c2da970077ca" args="(bool=false)" -->
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<td class="memname">virtual bool DynamicVariable::representsPositive </td>
<td>(</td>
<td class="paramtype">bool </td>
<td class="paramname"> = <code>false</code> </td>
<td> ) </td>
<td width="100%"><code> [inline, virtual]</code></td>
</tr>
</table>
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<div class="memdoc">
<p>
Returns if the variable represents a positive value.
<p>Reimplemented from <a class="el" href="classKnownVariable.html#bb6707edd7e47c78b5dba7e840428523">KnownVariable</a>.</p>
</div>
</div><p>
<hr>The documentation for this class was generated from the following file:<ul>
<li>libqalculate/<a class="el" href="Variable_8h.html">Variable.h</a></ul>
</div>
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