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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>libqalculate-0.9.7: KnownVariable Class Reference</title>
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<h1>KnownVariable Class Reference</h1><!-- doxytag: class="KnownVariable" --><!-- doxytag: inherits="Variable" -->A variable with a known value.
<a href="#_details">More...</a>
<p>
<code>#include <Variable.h></code>
<p>
<div class="dynheader">
Inheritance diagram for KnownVariable:</div>
<div class="dynsection">
<p><center><img src="classKnownVariable.png" usemap="#KnownVariable_map" border="0" alt=""></center>
<map name="KnownVariable_map">
<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">
<area href="classDynamicVariable.html" alt="DynamicVariable" shape="rect" coords="0,168,109,192">
</map>
</div>
<p>
<a href="classKnownVariable-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"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classKnownVariable.html#b5e159d27ccfd5129045f6fa611b61f3">KnownVariable</a> (string cat_, string name_, const <a class="el" href="classMathStructure.html">MathStructure</a> &o, string title_="", bool is_local=true, bool is_builtin=false, bool is_active=true)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classKnownVariable.html#371317c99c7a07820898d45b788431ca">KnownVariable</a> (string cat_, string name_, string expression_, string title_="", bool is_local=true, bool is_builtin=false, bool is_active=true)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classKnownVariable.html#6794900dc47e127cae001a5ec8af5e9b">KnownVariable</a> ()</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classKnownVariable.html#9ca24b6ae1b7caa636a43f16694e33bf">KnownVariable</a> (const <a class="el" href="classKnownVariable.html">KnownVariable</a> *variable)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="4c8d2bf7465ba186fe6a4879f492ae5a"></a><!-- doxytag: member="KnownVariable::copy" ref="4c8d2bf7465ba186fe6a4879f492ae5a" args="() const " -->
virtual <a class="el" href="classExpressionItem.html">ExpressionItem</a> * </td><td class="memItemRight" valign="bottom"><b>copy</b> () const </td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="3451de7a4c3c0848c14178af345100d9"></a><!-- doxytag: member="KnownVariable::set" ref="3451de7a4c3c0848c14178af345100d9" args="(const ExpressionItem *item)" -->
virtual 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">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classKnownVariable.html#76552c2fc02c6e9c41c9ba10acdc0efc">isKnown</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="classKnownVariable.html#78bc3730ecce97f44c907f25b5cd3136">isExpression</a> () const </td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual string </td><td class="memItemRight" valign="bottom"><a class="el" href="classKnownVariable.html#f421aaa4b74c8f3b7a1047b974085df4">expression</a> () const </td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="classKnownVariable.html#dbccee6770fa72d8074e70337871cc5b">subtype</a> () const </td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="classKnownVariable.html#b4602f4613094017ecd3dcc7c9989948">set</a> (const <a class="el" href="classMathStructure.html">MathStructure</a> &o)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="classKnownVariable.html#8e4025fe1a16385e24ad9662947a538c">set</a> (string expression_)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual const <a class="el" href="classMathStructure.html">MathStructure</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="classKnownVariable.html#f35979ac213868a22044422201f1fd1c">get</a> ()</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classKnownVariable.html#bb6707edd7e47c78b5dba7e840428523">representsPositive</a> (bool=false)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="17becb8ffc4dc5ed1d74b346922b78f3"></a><!-- doxytag: member="KnownVariable::representsNegative" ref="17becb8ffc4dc5ed1d74b346922b78f3" 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="0ad3236d79cbdca1ed4b60e94bc88c9e"></a><!-- doxytag: member="KnownVariable::representsNonNegative" ref="0ad3236d79cbdca1ed4b60e94bc88c9e" 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="3d60e107a90576dbba8275a67e665044"></a><!-- doxytag: member="KnownVariable::representsNonPositive" ref="3d60e107a90576dbba8275a67e665044" 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="aaa7afe4ed69fd24be5acf939391171b"></a><!-- doxytag: member="KnownVariable::representsInteger" ref="aaa7afe4ed69fd24be5acf939391171b" 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="33edfd16b2a0d9ec702e15fa633470a0"></a><!-- doxytag: member="KnownVariable::representsNumber" ref="33edfd16b2a0d9ec702e15fa633470a0" 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="daf80c5f0f00dba9a2ea0b05772fd921"></a><!-- doxytag: member="KnownVariable::representsRational" ref="daf80c5f0f00dba9a2ea0b05772fd921" 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="ecd4ce3d592aa2dc1652b20af630591a"></a><!-- doxytag: member="KnownVariable::representsReal" ref="ecd4ce3d592aa2dc1652b20af630591a" 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="162f7bc2ff447c104b31e93b5a0541ba"></a><!-- doxytag: member="KnownVariable::representsComplex" ref="162f7bc2ff447c104b31e93b5a0541ba" 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="3f6faf7c68bed4653ce3908fddeb0626"></a><!-- doxytag: member="KnownVariable::representsNonZero" ref="3f6faf7c68bed4653ce3908fddeb0626" 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="efb16afae80b7922ae581512b7a87e6c"></a><!-- doxytag: member="KnownVariable::representsEven" ref="efb16afae80b7922ae581512b7a87e6c" 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="e66b9b0ebb5efa5932e3b189d6e61942"></a><!-- doxytag: member="KnownVariable::representsOdd" ref="e66b9b0ebb5efa5932e3b189d6e61942" 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="b0284127b534e8364bb0fe8ee71a780b"></a><!-- doxytag: member="KnownVariable::representsUndefined" ref="b0284127b534e8364bb0fe8ee71a780b" 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="f32d07c88005834bea188a15d1615da2"></a><!-- doxytag: member="KnownVariable::representsBoolean" ref="f32d07c88005834bea188a15d1615da2" 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="55f8218ce70a37d529e0d8883ea87909"></a><!-- doxytag: member="KnownVariable::representsNonMatrix" ref="55f8218ce70a37d529e0d8883ea87909" args="()" -->
virtual bool </td><td class="memItemRight" valign="bottom"><b>representsNonMatrix</b> ()</td></tr>
<tr><td colspan="2"><br><h2>Protected Attributes</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="595f537509d2d0adb877ec4e819413b5"></a><!-- doxytag: member="KnownVariable::mstruct" ref="595f537509d2d0adb877ec4e819413b5" args="" -->
<a class="el" href="classMathStructure.html">MathStructure</a> * </td><td class="memItemRight" valign="bottom"><b>mstruct</b></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="c422687ac96ecfabaca4fa6a6a486971"></a><!-- doxytag: member="KnownVariable::b_expression" ref="c422687ac96ecfabaca4fa6a6a486971" args="" -->
bool </td><td class="memItemRight" valign="bottom"><b>b_expression</b></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="1d445df211540d5ccce5c95e504f2698"></a><!-- doxytag: member="KnownVariable::calculated_precision" ref="1d445df211540d5ccce5c95e504f2698" args="" -->
int </td><td class="memItemRight" valign="bottom"><b>calculated_precision</b></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="024a2084c2f3b0ef79232480e3bad3dc"></a><!-- doxytag: member="KnownVariable::sexpression" ref="024a2084c2f3b0ef79232480e3bad3dc" args="" -->
string </td><td class="memItemRight" valign="bottom"><b>sexpression</b></td></tr>
</table>
<hr><a name="_details"></a><h2>Detailed Description</h2>
A variable with a known value.
<p>
Known variables have an associated value. The value can be a simple number or a full mathematical expression. The known variable class is used both for variable values and constants.<p>
The value can be provided as an expression in the form of a text string or as a mathematical value in the form of an object of the <a class="el" href="classMathStructure.html" title="A structure representing a mathematical value/expression/result.">MathStructure</a> class. The text string is parsed when needed, which saves time when loading many variable definitions which might not be used, at least not immediately. <hr><h2>Constructor & Destructor Documentation</h2>
<a class="anchor" name="b5e159d27ccfd5129045f6fa611b61f3"></a><!-- doxytag: member="KnownVariable::KnownVariable" ref="b5e159d27ccfd5129045f6fa611b61f3" args="(string cat_, string name_, const MathStructure &o, string title_="", bool is_local=true, bool is_builtin=false, bool is_active=true)" -->
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">KnownVariable::KnownVariable </td>
<td>(</td>
<td class="paramtype">string </td>
<td class="paramname"> <em>cat_</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">string </td>
<td class="paramname"> <em>name_</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const <a class="el" href="classMathStructure.html">MathStructure</a> & </td>
<td class="paramname"> <em>o</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">string </td>
<td class="paramname"> <em>title_</em> = <code>""</code>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">bool </td>
<td class="paramname"> <em>is_local</em> = <code>true</code>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">bool </td>
<td class="paramname"> <em>is_builtin</em> = <code>false</code>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">bool </td>
<td class="paramname"> <em>is_active</em> = <code>true</code></td><td> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td><td width="100%"></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>
Create a known variable with a value.<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>cat_</em> </td><td>Category that the variable belongs to. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>name_</em> </td><td>Initial name of the variable. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>o</em> </td><td>Value. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>title_</em> </td><td>Descriptive name. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>is_local</em> </td><td>If the variable is local/user-defined or global. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>is_builtin</em> </td><td>If the variable is builtin and not modifiable. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>is_active</em> </td><td>If the variable is active and can be used in expressions. </td></tr>
</table>
</dl>
</div>
</div><p>
<a class="anchor" name="371317c99c7a07820898d45b788431ca"></a><!-- doxytag: member="KnownVariable::KnownVariable" ref="371317c99c7a07820898d45b788431ca" args="(string cat_, string name_, string expression_, string title_="", bool is_local=true, bool is_builtin=false, bool is_active=true)" -->
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">KnownVariable::KnownVariable </td>
<td>(</td>
<td class="paramtype">string </td>
<td class="paramname"> <em>cat_</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">string </td>
<td class="paramname"> <em>name_</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">string </td>
<td class="paramname"> <em>expression_</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">string </td>
<td class="paramname"> <em>title_</em> = <code>""</code>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">bool </td>
<td class="paramname"> <em>is_local</em> = <code>true</code>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">bool </td>
<td class="paramname"> <em>is_builtin</em> = <code>false</code>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">bool </td>
<td class="paramname"> <em>is_active</em> = <code>true</code></td><td> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td><td width="100%"></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>
Create a known variable with an text string expression.<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>cat_</em> </td><td>Category that the variable belongs to. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>name_</em> </td><td>Initial name of the variable. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>expression_</em> </td><td>Expression. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>title_</em> </td><td>Descriptive name. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>is_local</em> </td><td>If the variable is local/user-defined or global. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>is_builtin</em> </td><td>If the variable is builtin and not modifiable. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>is_active</em> </td><td>If the variable is active and can be used in expressions. </td></tr>
</table>
</dl>
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</div><p>
<a class="anchor" name="6794900dc47e127cae001a5ec8af5e9b"></a><!-- doxytag: member="KnownVariable::KnownVariable" ref="6794900dc47e127cae001a5ec8af5e9b" args="()" -->
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<td class="memname">KnownVariable::KnownVariable </td>
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<p>
Create an empty known variable. Primarily for internal use.
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<a class="anchor" name="9ca24b6ae1b7caa636a43f16694e33bf"></a><!-- doxytag: member="KnownVariable::KnownVariable" ref="9ca24b6ae1b7caa636a43f16694e33bf" args="(const KnownVariable *variable)" -->
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<td class="memname">KnownVariable::KnownVariable </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="classKnownVariable.html">KnownVariable</a> * </td>
<td class="paramname"> <em>variable</em> </td>
<td> ) </td>
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<p>
Create a copy of a known variable.<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>variable</em> </td><td>Known variable to copy. </td></tr>
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<hr><h2>Member Function Documentation</h2>
<a class="anchor" name="76552c2fc02c6e9c41c9ba10acdc0efc"></a><!-- doxytag: member="KnownVariable::isKnown" ref="76552c2fc02c6e9c41c9ba10acdc0efc" args="() const " -->
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<td class="memname">bool KnownVariable::isKnown </td>
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<td width="100%"> const<code> [inline, virtual]</code></td>
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Returns if the variable has a known value (as oppossed to assumptions).<p>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>true if the variable is of class <a class="el" href="classKnownVariable.html" title="A variable with a known value.">KnownVariable</a>, false if <a class="el" href="classUnknownVariable.html" title="A variable with unknown value.">UnknownVariable</a>. </dd></dl>
<p>Implements <a class="el" href="classVariable.html#1d3615b28d01c5a84346a63a97b64316">Variable</a>.</p>
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<a class="anchor" name="78bc3730ecce97f44c907f25b5cd3136"></a><!-- doxytag: member="KnownVariable::isExpression" ref="78bc3730ecce97f44c907f25b5cd3136" args="() const " -->
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<td class="memname">virtual bool KnownVariable::isExpression </td>
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<td width="100%"> const<code> [virtual]</code></td>
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Returns if the variable has an text string expression instead of a value.<p>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>True if the variable has an expression instead of a value. </dd></dl>
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<a class="anchor" name="f421aaa4b74c8f3b7a1047b974085df4"></a><!-- doxytag: member="KnownVariable::expression" ref="f421aaa4b74c8f3b7a1047b974085df4" args="() const " -->
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<td class="memname">virtual string KnownVariable::expression </td>
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<td width="100%"> const<code> [virtual]</code></td>
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Returns the variable's string expression or an empty string if it has not got an expression.<p>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>The variable's expression. </dd></dl>
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<a class="anchor" name="dbccee6770fa72d8074e70337871cc5b"></a><!-- doxytag: member="KnownVariable::subtype" ref="dbccee6770fa72d8074e70337871cc5b" args="() const " -->
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<td class="memname">int KnownVariable::subtype </td>
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<td width="100%"> const<code> [inline, virtual]</code></td>
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Returns the subtype of the variable, corresponding to which subsubclass the object belongs to.<p>
<dl class="return" compact><dt><b>Returns:</b></dt><dd><a class="el" href="Variable_8h.html#0f580b0f6ebc7c28d007d2ce18a78474" title="Type of variable.">VariableSubtype</a>. </dd></dl>
<p>Reimplemented from <a class="el" href="classVariable.html#3e6d81fe2467b8627b09af909e835742">Variable</a>.</p>
<p>References <a class="el" href="Variable_8h-source.html#l00068">SUBTYPE_KNOWN_VARIABLE</a>.</p>
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<a class="anchor" name="b4602f4613094017ecd3dcc7c9989948"></a><!-- doxytag: member="KnownVariable::set" ref="b4602f4613094017ecd3dcc7c9989948" args="(const MathStructure &o)" -->
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<td class="memname">virtual void KnownVariable::set </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="classMathStructure.html">MathStructure</a> & </td>
<td class="paramname"> <em>o</em> </td>
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<td width="100%"><code> [virtual]</code></td>
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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>
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</dl>
<p>Reimplemented in <a class="el" href="classDynamicVariable.html#e449e0df12e0a71de7cbcbdf5794a852">DynamicVariable</a>.</p>
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<a class="anchor" name="8e4025fe1a16385e24ad9662947a538c"></a><!-- doxytag: member="KnownVariable::set" ref="8e4025fe1a16385e24ad9662947a538c" args="(string expression_)" -->
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<td class="memname">virtual void KnownVariable::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>
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<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 in <a class="el" href="classDynamicVariable.html#1c480cef3c985e7ec4ea4d0cbb033706">DynamicVariable</a>.</p>
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<a class="anchor" name="f35979ac213868a22044422201f1fd1c"></a><!-- doxytag: member="KnownVariable::get" ref="f35979ac213868a22044422201f1fd1c" args="()" -->
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<td class="memname">virtual const <a class="el" href="classMathStructure.html">MathStructure</a>& KnownVariable::get </td>
<td>(</td>
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<td width="100%"><code> [virtual]</code></td>
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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 in <a class="el" href="classDynamicVariable.html#09f39a44b6495d9da4a42f826e7243c4">DynamicVariable</a>.</p>
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<a class="anchor" name="bb6707edd7e47c78b5dba7e840428523"></a><!-- doxytag: member="KnownVariable::representsPositive" ref="bb6707edd7e47c78b5dba7e840428523" args="(bool=false)" -->
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<td class="memname">virtual bool KnownVariable::representsPositive </td>
<td>(</td>
<td class="paramtype">bool </td>
<td class="paramname"> = <code>false</code> </td>
<td> ) </td>
<td width="100%"><code> [virtual]</code></td>
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<p>
Returns if the variable represents a positive value.
<p>Reimplemented from <a class="el" href="classVariable.html#4b34b6e7e72601c7915613498ef69744">Variable</a>.</p>
<p>Reimplemented in <a class="el" href="classDynamicVariable.html#3219611453495b5e6125c2da970077ca">DynamicVariable</a>.</p>
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</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>
<hr size="1"><address style="text-align: right;"><small>Generated on Tue Jan 5 08:26:29 2010 for libqalculate-0.9.7 by
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