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<li class="navelem"><a class="el" href="class_quant_lib_1_1_generalized_black_scholes_process.html">GeneralizedBlackScholesProcess</a> </li>
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<div class="title">GeneralizedBlackScholesProcess Class Reference<div class="ingroups"><a class="el" href="group__processes.html">Stochastic processes</a></div></div> </div>
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<!-- doxytag: class="QuantLib::GeneralizedBlackScholesProcess" --><!-- doxytag: inherits="QuantLib::StochasticProcess1D" -->
<p>Generalized Black-Scholes stochastic process.
<a href="class_quant_lib_1_1_generalized_black_scholes_process.html#details">More...</a></p>
<p><code>#include <ql/processes/blackscholesprocess.hpp></code></p>
<div class="dynheader">
Inheritance diagram for GeneralizedBlackScholesProcess:</div>
<div class="dyncontent">
<div class="center"><img src="class_quant_lib_1_1_generalized_black_scholes_process__inherit__graph.png" border="0" usemap="#_generalized_black_scholes_process_inherit__map" alt="Inheritance graph"/></div>
<map name="_generalized_black_scholes_process_inherit__map" id="_generalized_black_scholes_process_inherit__map">
<area shape="rect" id="node5" href="class_quant_lib_1_1_black_process.html" title="Black (1976) stochastic process." alt="" coords="541,5,643,35"/><area shape="rect" id="node7" href="class_quant_lib_1_1_black_scholes_merton_process.html" title="Merton (1973) extension to the Black-Scholes stochastic process." alt="" coords="497,58,687,89"/><area shape="rect" id="node9" href="class_quant_lib_1_1_black_scholes_process.html" title="Black-Scholes (1973) stochastic process." alt="" coords="517,111,667,142"/><area shape="rect" id="node11" href="class_quant_lib_1_1_extended_black_scholes_merton_process.html" title="experimental Black-Scholes-Merton stochastic process" alt="" coords="469,165,715,195"/><area shape="rect" id="node13" href="class_quant_lib_1_1_garman_kohlagen_process.html" title="Garman-Kohlhagen (1983) stochastic process." alt="" coords="508,218,676,249"/><area shape="rect" id="node15" href="class_quant_lib_1_1_vega_stressed_black_scholes_process.html" title="Black-Scholes process which supports local vega stress tests." alt="" coords="477,271,707,302"/><area shape="rect" id="node2" href="class_quant_lib_1_1_stochastic_process1_d.html" title="1-dimensional stochastic process" alt="" coords="7,138,153,169"/></map>
<center><span class="legend">[<a href="graph_legend.html">legend</a>]</span></center></div>
<p><a href="class_quant_lib_1_1_generalized_black_scholes_process-members.html">List of all members.</a></p>
<table class="memberdecls">
<tr><td colspan="2"><h2><a name="pub-methods"></a>
Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a3df0b86a1ef1cf90ccd7403887d2453a"></a><!-- doxytag: member="QuantLib::GeneralizedBlackScholesProcess::GeneralizedBlackScholesProcess" ref="a3df0b86a1ef1cf90ccd7403887d2453a" args="(const Handle< Quote > &x0, const Handle< YieldTermStructure > &dividendTS, const Handle< YieldTermStructure > &riskFreeTS, const Handle< BlackVolTermStructure > &blackVolTS, const boost::shared_ptr< discretization > &d=boost::shared_ptr< discretization >(new EulerDiscretization))" -->
 </td><td class="memItemRight" valign="bottom"><b>GeneralizedBlackScholesProcess</b> (const <a class="el" href="class_quant_lib_1_1_handle.html">Handle</a>< <a class="el" href="class_quant_lib_1_1_quote.html">Quote</a> > &<a class="el" href="class_quant_lib_1_1_generalized_black_scholes_process.html#a89d2f497b5fd0d0a0dce2ec82c86e778">x0</a>, const <a class="el" href="class_quant_lib_1_1_handle.html">Handle</a>< <a class="el" href="class_quant_lib_1_1_yield_term_structure.html">YieldTermStructure</a> > &dividendTS, const <a class="el" href="class_quant_lib_1_1_handle.html">Handle</a>< <a class="el" href="class_quant_lib_1_1_yield_term_structure.html">YieldTermStructure</a> > &riskFreeTS, const <a class="el" href="class_quant_lib_1_1_handle.html">Handle</a>< <a class="el" href="class_quant_lib_1_1_black_vol_term_structure.html">BlackVolTermStructure</a> > &blackVolTS, const boost::shared_ptr< <a class="el" href="class_quant_lib_1_1_stochastic_process_1_1discretization.html">discretization</a> > &d=boost::shared_ptr< <a class="el" href="class_quant_lib_1_1_stochastic_process_1_1discretization.html">discretization</a> >(new <a class="el" href="class_quant_lib_1_1_euler_discretization.html">EulerDiscretization</a>))</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__types.html#ga14fb8fca43a68f4168654e1f9f7e22f7">Time</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="class_quant_lib_1_1_generalized_black_scholes_process.html#af8a1d4ca4369b3009d08291f1c2d7744">time</a> (const <a class="el" href="class_quant_lib_1_1_date.html">Date</a> &) const </td></tr>
<tr><td colspan="2"><div class="groupHeader">StochasticProcess1D interface</div></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a89d2f497b5fd0d0a0dce2ec82c86e778"></a><!-- doxytag: member="QuantLib::GeneralizedBlackScholesProcess::x0" ref="a89d2f497b5fd0d0a0dce2ec82c86e778" args="() const " -->
<a class="el" href="group__types.html#ga4bdf4bfe76b9ffa6fa64c47d8bfa0c78">Real</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="class_quant_lib_1_1_generalized_black_scholes_process.html#a89d2f497b5fd0d0a0dce2ec82c86e778">x0</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">returns the initial value of the state variable <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__types.html#ga4bdf4bfe76b9ffa6fa64c47d8bfa0c78">Real</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="class_quant_lib_1_1_generalized_black_scholes_process.html#a545d33724b1d6d312eb8a17f73571842">drift</a> (<a class="el" href="group__types.html#ga14fb8fca43a68f4168654e1f9f7e22f7">Time</a> t, <a class="el" href="group__types.html#ga4bdf4bfe76b9ffa6fa64c47d8bfa0c78">Real</a> x) const </td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__types.html#ga4bdf4bfe76b9ffa6fa64c47d8bfa0c78">Real</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="class_quant_lib_1_1_generalized_black_scholes_process.html#ab4d7fe4af7a6dd0ae710c073569821e4">diffusion</a> (<a class="el" href="group__types.html#ga14fb8fca43a68f4168654e1f9f7e22f7">Time</a> t, <a class="el" href="group__types.html#ga4bdf4bfe76b9ffa6fa64c47d8bfa0c78">Real</a> x) const </td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__types.html#ga4bdf4bfe76b9ffa6fa64c47d8bfa0c78">Real</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="class_quant_lib_1_1_generalized_black_scholes_process.html#aee1aadb67f9085eb8a9fc89604bd8ead">apply</a> (<a class="el" href="group__types.html#ga4bdf4bfe76b9ffa6fa64c47d8bfa0c78">Real</a> <a class="el" href="class_quant_lib_1_1_generalized_black_scholes_process.html#a89d2f497b5fd0d0a0dce2ec82c86e778">x0</a>, <a class="el" href="group__types.html#ga4bdf4bfe76b9ffa6fa64c47d8bfa0c78">Real</a> dx) const </td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__types.html#ga4bdf4bfe76b9ffa6fa64c47d8bfa0c78">Real</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="class_quant_lib_1_1_generalized_black_scholes_process.html#a81842299056bb82662dce099fca6bcba">expectation</a> (<a class="el" href="group__types.html#ga14fb8fca43a68f4168654e1f9f7e22f7">Time</a> t0, <a class="el" href="group__types.html#ga4bdf4bfe76b9ffa6fa64c47d8bfa0c78">Real</a> <a class="el" href="class_quant_lib_1_1_generalized_black_scholes_process.html#a89d2f497b5fd0d0a0dce2ec82c86e778">x0</a>, <a class="el" href="group__types.html#ga14fb8fca43a68f4168654e1f9f7e22f7">Time</a> dt) const </td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__types.html#ga4bdf4bfe76b9ffa6fa64c47d8bfa0c78">Real</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="class_quant_lib_1_1_generalized_black_scholes_process.html#a28916b3498be74dceb699ad1499a46c0">evolve</a> (<a class="el" href="group__types.html#ga14fb8fca43a68f4168654e1f9f7e22f7">Time</a> t0, <a class="el" href="group__types.html#ga4bdf4bfe76b9ffa6fa64c47d8bfa0c78">Real</a> <a class="el" href="class_quant_lib_1_1_generalized_black_scholes_process.html#a89d2f497b5fd0d0a0dce2ec82c86e778">x0</a>, <a class="el" href="group__types.html#ga14fb8fca43a68f4168654e1f9f7e22f7">Time</a> dt, <a class="el" href="group__types.html#ga4bdf4bfe76b9ffa6fa64c47d8bfa0c78">Real</a> dw) const </td></tr>
<tr><td colspan="2"><div class="groupHeader">Observer interface</div></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_quant_lib_1_1_generalized_black_scholes_process.html#ac5c54df7ed3b930268c8d7752c101725">update</a> ()</td></tr>
<tr><td colspan="2"><div class="groupHeader">Inspectors</div></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a3fdbbd388a2432e1d8d9e94136acfdb8"></a><!-- doxytag: member="QuantLib::GeneralizedBlackScholesProcess::stateVariable" ref="a3fdbbd388a2432e1d8d9e94136acfdb8" args="() const " -->
const <a class="el" href="class_quant_lib_1_1_handle.html">Handle</a>< <a class="el" href="class_quant_lib_1_1_quote.html">Quote</a> > & </td><td class="memItemRight" valign="bottom"><b>stateVariable</b> () const </td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="ad410a408dd37b79578b370b5219dbf80"></a><!-- doxytag: member="QuantLib::GeneralizedBlackScholesProcess::dividendYield" ref="ad410a408dd37b79578b370b5219dbf80" args="() const " -->
const <a class="el" href="class_quant_lib_1_1_handle.html">Handle</a><br class="typebreak"/>
< <a class="el" href="class_quant_lib_1_1_yield_term_structure.html">YieldTermStructure</a> > & </td><td class="memItemRight" valign="bottom"><b>dividendYield</b> () const </td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a925fdf9de4dd73519b36f975bc7917a8"></a><!-- doxytag: member="QuantLib::GeneralizedBlackScholesProcess::riskFreeRate" ref="a925fdf9de4dd73519b36f975bc7917a8" args="() const " -->
const <a class="el" href="class_quant_lib_1_1_handle.html">Handle</a><br class="typebreak"/>
< <a class="el" href="class_quant_lib_1_1_yield_term_structure.html">YieldTermStructure</a> > & </td><td class="memItemRight" valign="bottom"><b>riskFreeRate</b> () const </td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a966c6dd76f94ceda5c3a344a8f3e3a8b"></a><!-- doxytag: member="QuantLib::GeneralizedBlackScholesProcess::blackVolatility" ref="a966c6dd76f94ceda5c3a344a8f3e3a8b" args="() const " -->
const <a class="el" href="class_quant_lib_1_1_handle.html">Handle</a><br class="typebreak"/>
< <a class="el" href="class_quant_lib_1_1_black_vol_term_structure.html">BlackVolTermStructure</a> > & </td><td class="memItemRight" valign="bottom"><b>blackVolatility</b> () const </td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="af113ff5ac835cfc641b3ccf701c030b5"></a><!-- doxytag: member="QuantLib::GeneralizedBlackScholesProcess::localVolatility" ref="af113ff5ac835cfc641b3ccf701c030b5" args="() const " -->
const <a class="el" href="class_quant_lib_1_1_handle.html">Handle</a><br class="typebreak"/>
< <a class="el" href="class_quant_lib_1_1_local_vol_term_structure.html">LocalVolTermStructure</a> > & </td><td class="memItemRight" valign="bottom"><b>localVolatility</b> () const </td></tr>
</table>
<hr/><a name="details" id="details"></a><h2>Detailed Description</h2>
<div class="textblock"><p>Generalized Black-Scholes stochastic process. </p>
<p>This class describes the stochastic process governed by </p>
<p class="formulaDsp">
<img class="formulaDsp" alt="\[ dS(t, S) = (r(t) - q(t) - \frac{\sigma(t, S)^2}{2}) dt + \sigma dW_t. \]" src="form_328.png"/>
</p>
</div><hr/><h2>Member Function Documentation</h2>
<a class="anchor" id="a545d33724b1d6d312eb8a17f73571842"></a><!-- doxytag: member="QuantLib::GeneralizedBlackScholesProcess::drift" ref="a545d33724b1d6d312eb8a17f73571842" args="(Time t, Real x) const " -->
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname"><a class="el" href="group__types.html#ga4bdf4bfe76b9ffa6fa64c47d8bfa0c78">Real</a> <a class="el" href="class_quant_lib_1_1_generalized_black_scholes_process.html#a545d33724b1d6d312eb8a17f73571842">drift</a> </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group__types.html#ga14fb8fca43a68f4168654e1f9f7e22f7">Time</a> </td>
<td class="paramname"><em>t</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="group__types.html#ga4bdf4bfe76b9ffa6fa64c47d8bfa0c78">Real</a> </td>
<td class="paramname"><em>x</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td> const<code> [virtual]</code></td>
</tr>
</table>
</div>
<div class="memdoc">
<dl class="todo"><dt><b><a class="el" href="todo.html#_todo000059">Possible enhancements:</a></b></dt><dd>revise extrapolation </dd></dl>
<p>Implements <a class="el" href="class_quant_lib_1_1_stochastic_process1_d.html#a6bded8896a46fad4d189950552432cd3">StochasticProcess1D</a>.</p>
<p>Reimplemented in <a class="el" href="class_quant_lib_1_1_extended_black_scholes_merton_process.html#a545d33724b1d6d312eb8a17f73571842">ExtendedBlackScholesMertonProcess</a>.</p>
</div>
</div>
<a class="anchor" id="ab4d7fe4af7a6dd0ae710c073569821e4"></a><!-- doxytag: member="QuantLib::GeneralizedBlackScholesProcess::diffusion" ref="ab4d7fe4af7a6dd0ae710c073569821e4" args="(Time t, Real x) const " -->
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname"><a class="el" href="group__types.html#ga4bdf4bfe76b9ffa6fa64c47d8bfa0c78">Real</a> <a class="el" href="class_quant_lib_1_1_generalized_black_scholes_process.html#ab4d7fe4af7a6dd0ae710c073569821e4">diffusion</a> </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group__types.html#ga14fb8fca43a68f4168654e1f9f7e22f7">Time</a> </td>
<td class="paramname"><em>t</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="group__types.html#ga4bdf4bfe76b9ffa6fa64c47d8bfa0c78">Real</a> </td>
<td class="paramname"><em>x</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td> const<code> [virtual]</code></td>
</tr>
</table>
</div>
<div class="memdoc">
<dl class="todo"><dt><b><a class="el" href="todo.html#_todo000060">Possible enhancements:</a></b></dt><dd>revise extrapolation </dd></dl>
<p>Implements <a class="el" href="class_quant_lib_1_1_stochastic_process1_d.html#afaf479da3baa52185b369071b1689d89">StochasticProcess1D</a>.</p>
<p>Reimplemented in <a class="el" href="class_quant_lib_1_1_extended_black_scholes_merton_process.html#ab4d7fe4af7a6dd0ae710c073569821e4">ExtendedBlackScholesMertonProcess</a>, and <a class="el" href="class_quant_lib_1_1_vega_stressed_black_scholes_process.html#ab4d7fe4af7a6dd0ae710c073569821e4">VegaStressedBlackScholesProcess</a>.</p>
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<a class="anchor" id="aee1aadb67f9085eb8a9fc89604bd8ead"></a><!-- doxytag: member="QuantLib::GeneralizedBlackScholesProcess::apply" ref="aee1aadb67f9085eb8a9fc89604bd8ead" args="(Real x0, Real dx) const " -->
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<td class="memname"><a class="el" href="group__types.html#ga4bdf4bfe76b9ffa6fa64c47d8bfa0c78">Real</a> <a class="el" href="class_quant_lib_1_1_generalized_black_scholes_process.html#aee1aadb67f9085eb8a9fc89604bd8ead">apply</a> </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group__types.html#ga4bdf4bfe76b9ffa6fa64c47d8bfa0c78">Real</a> </td>
<td class="paramname"><em>x0</em>, </td>
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<td class="paramtype"><a class="el" href="group__types.html#ga4bdf4bfe76b9ffa6fa64c47d8bfa0c78">Real</a> </td>
<td class="paramname"><em>dx</em> </td>
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<td>)</td>
<td></td><td> const<code> [virtual]</code></td>
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<p>applies a change to the asset value. By default, it returns <img class="formulaInl" alt="$ x + \Delta x $" src="form_366.png"/>. </p>
<p>Reimplemented from <a class="el" href="class_quant_lib_1_1_stochastic_process1_d.html#a905bb2d5a924e5274035b0850c3e04fb">StochasticProcess1D</a>.</p>
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<a class="anchor" id="a81842299056bb82662dce099fca6bcba"></a><!-- doxytag: member="QuantLib::GeneralizedBlackScholesProcess::expectation" ref="a81842299056bb82662dce099fca6bcba" args="(Time t0, Real x0, Time dt) const " -->
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<td class="memname"><a class="el" href="group__types.html#ga4bdf4bfe76b9ffa6fa64c47d8bfa0c78">Real</a> <a class="el" href="class_quant_lib_1_1_generalized_black_scholes_process.html#a81842299056bb82662dce099fca6bcba">expectation</a> </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group__types.html#ga14fb8fca43a68f4168654e1f9f7e22f7">Time</a> </td>
<td class="paramname"><em>t0</em>, </td>
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<td class="paramtype"><a class="el" href="group__types.html#ga4bdf4bfe76b9ffa6fa64c47d8bfa0c78">Real</a> </td>
<td class="paramname"><em>x0</em>, </td>
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<td class="paramtype"><a class="el" href="group__types.html#ga14fb8fca43a68f4168654e1f9f7e22f7">Time</a> </td>
<td class="paramname"><em>dt</em> </td>
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<td>)</td>
<td></td><td> const<code> [virtual]</code></td>
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<dl class="caveats"><dt><b><a class="el" href="caveats.html#_caveats000104">Warning:</a></b></dt><dd>raises a "not implemented" exception. It should be rewritten to return the expectation E(S) of the process, not exp(E(log S)). </dd></dl>
<p>Reimplemented from <a class="el" href="class_quant_lib_1_1_stochastic_process1_d.html#a8be83040b1b61f27a482f14d5b461caa">StochasticProcess1D</a>.</p>
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<a class="anchor" id="a28916b3498be74dceb699ad1499a46c0"></a><!-- doxytag: member="QuantLib::GeneralizedBlackScholesProcess::evolve" ref="a28916b3498be74dceb699ad1499a46c0" args="(Time t0, Real x0, Time dt, Real dw) const " -->
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<td class="memname"><a class="el" href="group__types.html#ga4bdf4bfe76b9ffa6fa64c47d8bfa0c78">Real</a> <a class="el" href="class_quant_lib_1_1_generalized_black_scholes_process.html#a28916b3498be74dceb699ad1499a46c0">evolve</a> </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group__types.html#ga14fb8fca43a68f4168654e1f9f7e22f7">Time</a> </td>
<td class="paramname"><em>t0</em>, </td>
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<td class="paramtype"><a class="el" href="group__types.html#ga4bdf4bfe76b9ffa6fa64c47d8bfa0c78">Real</a> </td>
<td class="paramname"><em>x0</em>, </td>
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<td class="paramtype"><a class="el" href="group__types.html#ga14fb8fca43a68f4168654e1f9f7e22f7">Time</a> </td>
<td class="paramname"><em>dt</em>, </td>
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<td class="paramtype"><a class="el" href="group__types.html#ga4bdf4bfe76b9ffa6fa64c47d8bfa0c78">Real</a> </td>
<td class="paramname"><em>dw</em> </td>
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<td>)</td>
<td></td><td> const<code> [virtual]</code></td>
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<p>returns the asset value after a time interval <img class="formulaInl" alt="$ \Delta t $" src="form_354.png"/> according to the given discretization. By default, it returns </p>
<p class="formulaDsp">
<img class="formulaDsp" alt="\[ E(x_0,t_0,\Delta t) + S(x_0,t_0,\Delta t) \cdot \Delta w \]" src="form_365.png"/>
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<p> where <img class="formulaInl" alt="$ E $" src="form_358.png"/> is the expectation and <img class="formulaInl" alt="$ S $" src="form_212.png"/> the standard deviation. </p>
<p>Reimplemented from <a class="el" href="class_quant_lib_1_1_stochastic_process1_d.html#a690ddf2804c6862d281f9181bd2b633e">StochasticProcess1D</a>.</p>
<p>Reimplemented in <a class="el" href="class_quant_lib_1_1_extended_black_scholes_merton_process.html#a28916b3498be74dceb699ad1499a46c0">ExtendedBlackScholesMertonProcess</a>.</p>
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<a class="anchor" id="af8a1d4ca4369b3009d08291f1c2d7744"></a><!-- doxytag: member="QuantLib::GeneralizedBlackScholesProcess::time" ref="af8a1d4ca4369b3009d08291f1c2d7744" args="(const Date &) const " -->
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<td class="memname"><a class="el" href="group__types.html#ga14fb8fca43a68f4168654e1f9f7e22f7">Time</a> <a class="el" href="class_quant_lib_1_1_generalized_black_scholes_process.html#af8a1d4ca4369b3009d08291f1c2d7744">time</a> </td>
<td>(</td>
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<p>returns the time value corresponding to the given date in the reference system of the stochastic process.</p>
<dl class="note"><dt><b>Note:</b></dt><dd>As a number of processes might not need this functionality, a default implementation is given which raises an exception. </dd></dl>
<p>Reimplemented from <a class="el" href="class_quant_lib_1_1_stochastic_process.html#acb2c915740d2c20c6ee1f5c27b05caef">StochasticProcess</a>.</p>
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<a class="anchor" id="ac5c54df7ed3b930268c8d7752c101725"></a><!-- doxytag: member="QuantLib::GeneralizedBlackScholesProcess::update" ref="ac5c54df7ed3b930268c8d7752c101725" args="()" -->
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<td class="memname">void <a class="el" href="class_quant_lib_1_1_generalized_black_scholes_process.html#ac5c54df7ed3b930268c8d7752c101725">update</a> </td>
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<td><code> [virtual]</code></td>
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<p>This method must be implemented in derived classes. An instance of Observer does not call this method directly: instead, it will be called by the observables the instance registered with when they need to notify any changes. </p>
<p>Reimplemented from <a class="el" href="class_quant_lib_1_1_stochastic_process.html#ac5c54df7ed3b930268c8d7752c101725">StochasticProcess</a>.</p>
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