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<div id="projectbrief">A free/open-source library for quantitative finance</div>
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<li class="navelem"><a class="el" href="namespace_quant_lib.html">QuantLib</a></li><li class="navelem"><a class="el" href="class_quant_lib_1_1_lazy_object.html">LazyObject</a></li> </ul>
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<div class="title">LazyObject Class Reference<span class="mlabels"><span class="mlabel">abstract</span></span><div class="ingroups"><a class="el" href="group__patterns.html">Design patterns</a></div></div> </div>
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<p>Framework for calculation on demand and result caching.
<a href="class_quant_lib_1_1_lazy_object.html#details">More...</a></p>
<p><code>#include <ql/patterns/lazyobject.hpp></code></p>
<div id="dynsection-0" onclick="return toggleVisibility(this)" class="dynheader closed" style="cursor:pointer;">
<img id="dynsection-0-trigger" src="closed.png" alt="+"/> Inheritance diagram for LazyObject:</div>
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<div class="center"><img src="class_quant_lib_1_1_lazy_object__inherit__graph.png" border="0" usemap="#a_lazy_object_inherit__map" alt="Inheritance graph"/></div>
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<center><span class="legend">[<a href="graph_legend.html">legend</a>]</span></center></div>
<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-methods"></a>
Public Member Functions</h2></td></tr>
<tr><td colspan="2"><div class="groupHeader">Observer interface</div></td></tr>
<tr class="memitem:ac5c54df7ed3b930268c8d7752c101725"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_quant_lib_1_1_lazy_object.html#ac5c54df7ed3b930268c8d7752c101725">update</a> ()</td></tr>
<tr class="separator:ac5c54df7ed3b930268c8d7752c101725"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="inherit_header pub_methods_class_quant_lib_1_1_observable"><td colspan="2" onclick="javascript:toggleInherit('pub_methods_class_quant_lib_1_1_observable')"><img src="closed.png" alt="-"/> Public Member Functions inherited from <a class="el" href="class_quant_lib_1_1_observable.html">Observable</a></td></tr>
<tr class="memitem:a840dd96e33a304cbf681d357de7f48d0 inherit pub_methods_class_quant_lib_1_1_observable"><td class="memItemLeft" align="right" valign="top"><a id="a840dd96e33a304cbf681d357de7f48d0"></a>
 </td><td class="memItemRight" valign="bottom"><b>Observable</b> (const <a class="el" href="class_quant_lib_1_1_observable.html">Observable</a> &)</td></tr>
<tr class="separator:a840dd96e33a304cbf681d357de7f48d0 inherit pub_methods_class_quant_lib_1_1_observable"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a522aacdd0f2408fe5e46527a6db999b4 inherit pub_methods_class_quant_lib_1_1_observable"><td class="memItemLeft" align="right" valign="top"><a class="el" href="class_quant_lib_1_1_observable.html">Observable</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="class_quant_lib_1_1_observable.html#a522aacdd0f2408fe5e46527a6db999b4">operator=</a> (const <a class="el" href="class_quant_lib_1_1_observable.html">Observable</a> &)</td></tr>
<tr class="separator:a522aacdd0f2408fe5e46527a6db999b4 inherit pub_methods_class_quant_lib_1_1_observable"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a397546715bfc5aedd1d16dd202a19d4c inherit pub_methods_class_quant_lib_1_1_observable"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_quant_lib_1_1_observable.html#a397546715bfc5aedd1d16dd202a19d4c">notifyObservers</a> ()</td></tr>
<tr class="separator:a397546715bfc5aedd1d16dd202a19d4c inherit pub_methods_class_quant_lib_1_1_observable"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="inherit_header pub_methods_class_quant_lib_1_1_observer"><td colspan="2" onclick="javascript:toggleInherit('pub_methods_class_quant_lib_1_1_observer')"><img src="closed.png" alt="-"/> Public Member Functions inherited from <a class="el" href="class_quant_lib_1_1_observer.html">Observer</a></td></tr>
<tr class="memitem:af6a9d3ca0b7f388f3b7ccb1eccf11f63 inherit pub_methods_class_quant_lib_1_1_observer"><td class="memItemLeft" align="right" valign="top"><a id="af6a9d3ca0b7f388f3b7ccb1eccf11f63"></a>
 </td><td class="memItemRight" valign="bottom"><b>Observer</b> (const <a class="el" href="class_quant_lib_1_1_observer.html">Observer</a> &)</td></tr>
<tr class="separator:af6a9d3ca0b7f388f3b7ccb1eccf11f63 inherit pub_methods_class_quant_lib_1_1_observer"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a6810b3645967da11d5f5d4804d37bacc inherit pub_methods_class_quant_lib_1_1_observer"><td class="memItemLeft" align="right" valign="top"><a id="a6810b3645967da11d5f5d4804d37bacc"></a>
<a class="el" href="class_quant_lib_1_1_observer.html">Observer</a> & </td><td class="memItemRight" valign="bottom"><b>operator=</b> (const <a class="el" href="class_quant_lib_1_1_observer.html">Observer</a> &)</td></tr>
<tr class="separator:a6810b3645967da11d5f5d4804d37bacc inherit pub_methods_class_quant_lib_1_1_observer"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:aa6ade205ed506bf712da2704f80a73a0 inherit pub_methods_class_quant_lib_1_1_observer"><td class="memItemLeft" align="right" valign="top"><a id="aa6ade205ed506bf712da2704f80a73a0"></a>
std::pair< iterator, bool > </td><td class="memItemRight" valign="bottom"><b>registerWith</b> (const ext::shared_ptr< <a class="el" href="class_quant_lib_1_1_observable.html">Observable</a> > &)</td></tr>
<tr class="separator:aa6ade205ed506bf712da2704f80a73a0 inherit pub_methods_class_quant_lib_1_1_observer"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a51d57eb97a3a57312a47bda29235f182 inherit pub_methods_class_quant_lib_1_1_observer"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_quant_lib_1_1_observer.html#a51d57eb97a3a57312a47bda29235f182">registerWithObservables</a> (const ext::shared_ptr< <a class="el" href="class_quant_lib_1_1_observer.html">Observer</a> > &)</td></tr>
<tr class="separator:a51d57eb97a3a57312a47bda29235f182 inherit pub_methods_class_quant_lib_1_1_observer"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a4ce7359ad0f73a54dba555be24855804 inherit pub_methods_class_quant_lib_1_1_observer"><td class="memItemLeft" align="right" valign="top"><a id="a4ce7359ad0f73a54dba555be24855804"></a>
<a class="el" href="group__types.html#gaf38bdb4c54463b1f456655efa95b5c77">Size</a> </td><td class="memItemRight" valign="bottom"><b>unregisterWith</b> (const ext::shared_ptr< <a class="el" href="class_quant_lib_1_1_observable.html">Observable</a> > &)</td></tr>
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void </td><td class="memItemRight" valign="bottom"><b>unregisterWithAll</b> ()</td></tr>
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<tr class="memitem:a3d53f9669c128dadc74a5d044a7c8e68 inherit pub_methods_class_quant_lib_1_1_observer"><td class="memItemLeft" align="right" valign="top">virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_quant_lib_1_1_observer.html#a3d53f9669c128dadc74a5d044a7c8e68">deepUpdate</a> ()</td></tr>
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</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="member-group"></a>
Calculations</h2></td></tr>
<tr><td class="ititle" colspan="2"><p><a class="anchor" id="amgrp003ef63180e665dd5b156927d9dcf524"></a>These methods do not modify the structure of the object and are therefore declared as <code>const</code>. Data members which will be calculated on demand need to be declared as mutable. </p>
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bool </td><td class="memItemRight" valign="bottom"><b>calculated_</b></td></tr>
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bool </td><td class="memItemRight" valign="bottom"><b>frozen_</b></td></tr>
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bool </td><td class="memItemRight" valign="bottom"><b>alwaysForward_</b></td></tr>
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<tr class="memitem:a467a786be42a2165aa15a26709674547"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_quant_lib_1_1_lazy_object.html#a467a786be42a2165aa15a26709674547">recalculate</a> ()</td></tr>
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<tr class="memitem:abd8698b462ce90fe56b15ce7a0192d3e"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_quant_lib_1_1_lazy_object.html#abd8698b462ce90fe56b15ce7a0192d3e">freeze</a> ()</td></tr>
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<tr class="memitem:a26c02da24a82bc72024a8e8d48af0fca"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_quant_lib_1_1_lazy_object.html#a26c02da24a82bc72024a8e8d48af0fca">unfreeze</a> ()</td></tr>
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<tr class="memitem:a2ee394ca135f85485023ce3dc037149c"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_quant_lib_1_1_lazy_object.html#a2ee394ca135f85485023ce3dc037149c">alwaysForwardNotifications</a> ()</td></tr>
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<tr class="memitem:a082ff96da379d5e17436372ccb3c0972"><td class="memItemLeft" align="right" valign="top">virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_quant_lib_1_1_lazy_object.html#a082ff96da379d5e17436372ccb3c0972">calculate</a> () const</td></tr>
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<tr class="memitem:a572dbe926524786c64db01e31dba7ab8"><td class="memItemLeft" align="right" valign="top">virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_quant_lib_1_1_lazy_object.html#a572dbe926524786c64db01e31dba7ab8">performCalculations</a> () const =0</td></tr>
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Additional Inherited Members</h2></td></tr>
<tr class="inherit_header pub_types_class_quant_lib_1_1_observer"><td colspan="2" onclick="javascript:toggleInherit('pub_types_class_quant_lib_1_1_observer')"><img src="closed.png" alt="-"/> Public Types inherited from <a class="el" href="class_quant_lib_1_1_observer.html">Observer</a></td></tr>
<tr class="memitem:a78de5f2b6bce96d718e3c18b9f52d67c inherit pub_types_class_quant_lib_1_1_observer"><td class="memItemLeft" align="right" valign="top"><a id="a78de5f2b6bce96d718e3c18b9f52d67c"></a>
typedef boost::unordered_set< ext::shared_ptr< <a class="el" href="class_quant_lib_1_1_observable.html">Observable</a> > > </td><td class="memItemRight" valign="bottom"><b>set_type</b></td></tr>
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<tr class="memitem:ae98429250f6997df7b87f4b37454609e inherit pub_types_class_quant_lib_1_1_observer"><td class="memItemLeft" align="right" valign="top"><a id="ae98429250f6997df7b87f4b37454609e"></a>
typedef set_type::iterator </td><td class="memItemRight" valign="bottom"><b>iterator</b></td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>Framework for calculation on demand and result caching. </p>
</div><h2 class="groupheader">Member Function Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#ac5c54df7ed3b930268c8d7752c101725">◆ </a></span>update()</h2>
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<td class="memname">void update </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>Implements <a class="el" href="class_quant_lib_1_1_observer.html#a99b02345a8a15d3c5ea2844a2253f510">Observer</a>.</p>
<p>Reimplemented in <a class="el" href="class_quant_lib_1_1_piecewise_yield_curve.html#ac5c54df7ed3b930268c8d7752c101725">PiecewiseYieldCurve< Traits, Interpolator, Bootstrap ></a>, <a class="el" href="class_quant_lib_1_1_flat_forward.html#ac5c54df7ed3b930268c8d7752c101725">FlatForward</a>, <a class="el" href="class_quant_lib_1_1_fitted_bond_discount_curve.html#ac5c54df7ed3b930268c8d7752c101725">FittedBondDiscountCurve</a>, <a class="el" href="class_quant_lib_1_1_cms_market.html#ac5c54df7ed3b930268c8d7752c101725">CmsMarket</a>, <a class="el" href="class_quant_lib_1_1_stripped_optionlet_adapter.html#ac5c54df7ed3b930268c8d7752c101725">StrippedOptionletAdapter</a>, <a class="el" href="class_quant_lib_1_1_cap_floor_term_vol_surface.html#ac5c54df7ed3b930268c8d7752c101725">CapFloorTermVolSurface</a>, <a class="el" href="class_quant_lib_1_1_cap_floor_term_vol_curve.html#ac5c54df7ed3b930268c8d7752c101725">CapFloorTermVolCurve</a>, <a class="el" href="class_quant_lib_1_1_piecewise_zero_inflation_curve.html#ac5c54df7ed3b930268c8d7752c101725">PiecewiseZeroInflationCurve< Interpolator, Bootstrap, Traits ></a>, <a class="el" href="class_quant_lib_1_1_piecewise_yo_y_inflation_curve.html#ac5c54df7ed3b930268c8d7752c101725">PiecewiseYoYInflationCurve< Interpolator, Bootstrap, Traits ></a>, <a class="el" href="class_quant_lib_1_1_piecewise_default_curve.html#ac5c54df7ed3b930268c8d7752c101725">PiecewiseDefaultCurve< Traits, Interpolator, Bootstrap ></a>, and <a class="el" href="class_quant_lib_1_1_forward_swap_quote.html#ac5c54df7ed3b930268c8d7752c101725">ForwardSwapQuote</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a467a786be42a2165aa15a26709674547">◆ </a></span>recalculate()</h2>
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<td class="memname">void recalculate </td>
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<p>This method force the recalculation of any results which would otherwise be cached. It is not declared as <code>const</code> since it needs to call the non-<code>const</code> <em><b>notifyObservers</b></em> method.</p>
<dl class="section note"><dt>Note</dt><dd>Explicit invocation of this method is <b>not</b> necessary if the object registered itself as observer with the structures on which such results depend. It is strongly advised to follow this policy when possible. </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#abd8698b462ce90fe56b15ce7a0192d3e">◆ </a></span>freeze()</h2>
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<td class="memname">void freeze </td>
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<p>This method constrains the object to return the presently cached results on successive invocations, even if arguments upon which they depend should change. </p>
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<h2 class="memtitle"><span class="permalink"><a href="#a26c02da24a82bc72024a8e8d48af0fca">◆ </a></span>unfreeze()</h2>
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<td class="memname">void unfreeze </td>
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<p>This method reverts the effect of the <em><b>freeze</b></em> method, thus re-enabling recalculations. </p>
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<h2 class="memtitle"><span class="permalink"><a href="#a2ee394ca135f85485023ce3dc037149c">◆ </a></span>alwaysForwardNotifications()</h2>
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<td class="memname">void alwaysForwardNotifications </td>
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<p>This method causes the object to forward all notifications, even when not calculated. The default behavior is to forward the first notification received, and discard the others until recalculated; the rationale is that observers were already notified, and don't need further notification until they recalculate, at which point this object would be recalculated too. After recalculation, this object would again forward the first notification received.</p>
<dl class="caveats"><dt><b><a class="el" href="caveats.html#_caveats000117">Warning:</a></b></dt><dd>Forwarding all notifications will cause a performance hit, and should be used only when discarding notifications cause an incorrect behavior. </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#a082ff96da379d5e17436372ccb3c0972">◆ </a></span>calculate()</h2>
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<td class="memname">void calculate </td>
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<p>This method performs all needed calculations by calling the <em><b>performCalculations</b></em> method.</p>
<dl class="caveats"><dt><b><a class="el" href="caveats.html#_caveats000118">Warning:</a></b></dt><dd>Objects cache the results of the previous calculation. Such results will be returned upon later invocations of <em><b>calculate</b></em>. When the results depend on arguments which could change between invocations, the lazy object must register itself as observer of such objects for the calculations to be performed again when they change.</dd></dl>
<dl class="caveats"><dt><b><a class="el" href="caveats.html#_caveats000119">Warning:</a></b></dt><dd>Should this method be redefined in derived classes, <a class="el" href="class_quant_lib_1_1_lazy_object.html#a082ff96da379d5e17436372ccb3c0972">LazyObject::calculate()</a> should be called in the overriding method. </dd></dl>
<p>Reimplemented in <a class="el" href="class_quant_lib_1_1_instrument.html#a082ff96da379d5e17436372ccb3c0972">Instrument</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a572dbe926524786c64db01e31dba7ab8">◆ </a></span>performCalculations()</h2>
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<td class="memname">virtual void performCalculations </td>
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<p>This method must implement any calculations which must be (re)done in order to calculate the desired results. </p>
<p>Implemented in <a class="el" href="class_quant_lib_1_1_swaption_volatility_matrix.html#a33f04fb3ac37abe7c9c6032cff611745">SwaptionVolatilityMatrix</a>, <a class="el" href="class_quant_lib_1_1_swaption_volatility_cube.html#a33f04fb3ac37abe7c9c6032cff611745">SwaptionVolatilityCube</a>, <a class="el" href="class_quant_lib_1_1_stripped_optionlet_adapter.html#a33f04fb3ac37abe7c9c6032cff611745">StrippedOptionletAdapter</a>, <a class="el" href="class_quant_lib_1_1_optionlet_stripper2.html#a33f04fb3ac37abe7c9c6032cff611745">OptionletStripper2</a>, <a class="el" href="class_quant_lib_1_1_optionlet_stripper1.html#a33f04fb3ac37abe7c9c6032cff611745">OptionletStripper1</a>, <a class="el" href="class_quant_lib_1_1_andreasen_huge_volatility_interpl.html#a33f04fb3ac37abe7c9c6032cff611745">AndreasenHugeVolatilityInterpl</a>, <a class="el" href="class_quant_lib_1_1_cap_floor_term_vol_surface.html#a33f04fb3ac37abe7c9c6032cff611745">CapFloorTermVolSurface</a>, <a class="el" href="class_quant_lib_1_1_cap_floor_term_vol_curve.html#a33f04fb3ac37abe7c9c6032cff611745">CapFloorTermVolCurve</a>, <a class="el" href="class_quant_lib_1_1_implied_std_dev_quote.html#a33f04fb3ac37abe7c9c6032cff611745">ImpliedStdDevQuote</a>, <a class="el" href="class_quant_lib_1_1_forward_swap_quote.html#a33f04fb3ac37abe7c9c6032cff611745">ForwardSwapQuote</a>, <a class="el" href="class_quant_lib_1_1_eurodollar_futures_implied_std_dev_quote.html#a33f04fb3ac37abe7c9c6032cff611745">EurodollarFuturesImpliedStdDevQuote</a>, <a class="el" href="class_quant_lib_1_1_markov_functional.html#a33f04fb3ac37abe7c9c6032cff611745">MarkovFunctional</a>, <a class="el" href="class_quant_lib_1_1_gsr.html#a33f04fb3ac37abe7c9c6032cff611745">Gsr</a>, <a class="el" href="class_quant_lib_1_1_gaussian1d_model.html#a33f04fb3ac37abe7c9c6032cff611745">Gaussian1dModel</a>, <a class="el" href="class_quant_lib_1_1_heston_model_helper.html#a33f04fb3ac37abe7c9c6032cff611745">HestonModelHelper</a>, <a class="el" href="class_quant_lib_1_1_black_calibration_helper.html#a33f04fb3ac37abe7c9c6032cff611745">BlackCalibrationHelper</a>, <a class="el" href="class_quant_lib_1_1_stock.html#a33f04fb3ac37abe7c9c6032cff611745">Stock</a>, <a class="el" href="class_quant_lib_1_1_forward_rate_agreement.html#a33f04fb3ac37abe7c9c6032cff611745">ForwardRateAgreement</a>, <a class="el" href="class_quant_lib_1_1_forward.html#a33f04fb3ac37abe7c9c6032cff611745">Forward</a>, <a class="el" href="class_quant_lib_1_1_fixed_rate_bond_forward.html#a33f04fb3ac37abe7c9c6032cff611745">FixedRateBondForward</a>, <a class="el" href="class_quant_lib_1_1_composite_instrument.html#a33f04fb3ac37abe7c9c6032cff611745">CompositeInstrument</a>, <a class="el" href="class_quant_lib_1_1_instrument.html#a33f04fb3ac37abe7c9c6032cff611745">Instrument</a>, <a class="el" href="class_quant_lib_1_1_abcd_atm_vol_curve.html#a33f04fb3ac37abe7c9c6032cff611745">AbcdAtmVolCurve</a>, <a class="el" href="class_quant_lib_1_1_heston_s_l_v_m_c_model.html#a33f04fb3ac37abe7c9c6032cff611745">HestonSLVMCModel</a>, <a class="el" href="class_quant_lib_1_1_risky_bond.html#a33f04fb3ac37abe7c9c6032cff611745">RiskyBond</a>, <a class="el" href="class_quant_lib_1_1_random_l_m.html#a33f04fb3ac37abe7c9c6032cff611745">RandomLM< derivedRandomLM, copulaPolicy, USNG ></a>, <a class="el" href="class_quant_lib_1_1_convertible_bond.html#a33f04fb3ac37abe7c9c6032cff611745">ConvertibleBond</a>, <a class="el" href="class_quant_lib_1_1_energy_vanilla_swap.html#a33f04fb3ac37abe7c9c6032cff611745">EnergyVanillaSwap</a>, <a class="el" href="class_quant_lib_1_1_energy_future.html#a33f04fb3ac37abe7c9c6032cff611745">EnergyFuture</a>, and <a class="el" href="class_quant_lib_1_1_energy_basis_swap.html#a33f04fb3ac37abe7c9c6032cff611745">EnergyBasisSwap</a>.</p>
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