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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_observer.html">Observer</a></li> </ul>
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<p>Object that gets notified when a given observable changes.
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<p><code>#include <ql/patterns/observable.hpp></code></p>
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<img id="dynsection-0-trigger" src="closed.png" alt="+"/> Inheritance diagram for Observer:</div>
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<table class="memberdecls">
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Public Types</h2></td></tr>
<tr class="memitem:a78de5f2b6bce96d718e3c18b9f52d67c"><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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typedef set_type::iterator </td><td class="memItemRight" valign="bottom"><b>iterator</b></td></tr>
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</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-methods"></a>
Public Member Functions</h2></td></tr>
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 </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>
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<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>
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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>
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<tr class="memitem:a51d57eb97a3a57312a47bda29235f182"><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>
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<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:a99b02345a8a15d3c5ea2844a2253f510"><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#a99b02345a8a15d3c5ea2844a2253f510">update</a> ()=0</td></tr>
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<tr class="memitem:a3d53f9669c128dadc74a5d044a7c8e68"><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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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>Object that gets notified when a given observable changes. </p>
</div><h2 class="groupheader">Member Function Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#a51d57eb97a3a57312a47bda29235f182">◆ </a></span>registerWithObservables()</h2>
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<td class="memname">void registerWithObservables </td>
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<td class="paramtype">const ext::shared_ptr< <a class="el" href="class_quant_lib_1_1_observer.html">Observer</a> > & </td>
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<p>register with all observables of a given observer. Note that this does not include registering with the observer itself. </p>
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<h2 class="memtitle"><span class="permalink"><a href="#a99b02345a8a15d3c5ea2844a2253f510">◆ </a></span>update()</h2>
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<td class="memname">virtual void update </td>
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<span class="mlabels"><span class="mlabel">pure virtual</span></span> </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>Implemented in <a class="el" href="class_quant_lib_1_1_yield_term_structure.html#ac5c54df7ed3b930268c8d7752c101725">YieldTermStructure</a>, <a class="el" href="class_quant_lib_1_1_zero_spreaded_term_structure.html#ac5c54df7ed3b930268c8d7752c101725">ZeroSpreadedTermStructure</a>, <a class="el" href="class_quant_lib_1_1_interpolated_piecewise_zero_spreaded_term_structure.html#ac5c54df7ed3b930268c8d7752c101725">InterpolatedPiecewiseZeroSpreadedTermStructure< Interpolator ></a>, <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_forward_spreaded_term_structure.html#ac5c54df7ed3b930268c8d7752c101725">ForwardSpreadedTermStructure</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_smile_section.html#acd36d7881ea8503d5c5824e7a5ad6c7e">SmileSection</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_default_probability_term_structure.html#ac5c54df7ed3b930268c8d7752c101725">DefaultProbabilityTermStructure</a>, <a class="el" href="class_quant_lib_1_1_piecewise_default_curve.html#ac5c54df7ed3b930268c8d7752c101725">PiecewiseDefaultCurve< Traits, Interpolator, Bootstrap ></a>, <a class="el" href="class_quant_lib_1_1_cds_helper.html#ac5c54df7ed3b930268c8d7752c101725">CdsHelper</a>, <a class="el" href="class_quant_lib_1_1_relative_date_bootstrap_helper.html#ac5c54df7ed3b930268c8d7752c101725">RelativeDateBootstrapHelper< TS ></a>, <a class="el" href="class_quant_lib_1_1_bootstrap_helper.html#ac5c54df7ed3b930268c8d7752c101725">BootstrapHelper< TS ></a>, <a class="el" href="class_quant_lib_1_1_bootstrap_helper.html#ac5c54df7ed3b930268c8d7752c101725">BootstrapHelper< YoYInflationTermStructure ></a>, <a class="el" href="class_quant_lib_1_1_bootstrap_helper.html#ac5c54df7ed3b930268c8d7752c101725">BootstrapHelper< ZeroInflationTermStructure ></a>, <a class="el" href="class_quant_lib_1_1_bootstrap_helper.html#ac5c54df7ed3b930268c8d7752c101725">BootstrapHelper< YoYOptionletVolatilitySurface ></a>, <a class="el" href="class_quant_lib_1_1_term_structure.html#ac5c54df7ed3b930268c8d7752c101725">TermStructure</a>, <a class="el" href="class_quant_lib_1_1_stochastic_process.html#ac5c54df7ed3b930268c8d7752c101725">StochasticProcess</a>, <a class="el" href="class_quant_lib_1_1_last_fixing_quote.html#ac5c54df7ed3b930268c8d7752c101725">LastFixingQuote</a>, <a class="el" href="class_quant_lib_1_1_futures_conv_adjustment_quote.html#ac5c54df7ed3b930268c8d7752c101725">FuturesConvAdjustmentQuote</a>, <a class="el" href="class_quant_lib_1_1_forward_value_quote.html#ac5c54df7ed3b930268c8d7752c101725">ForwardValueQuote</a>, <a class="el" href="class_quant_lib_1_1_forward_swap_quote.html#ac5c54df7ed3b930268c8d7752c101725">ForwardSwapQuote</a>, <a class="el" href="class_quant_lib_1_1_derived_quote.html#ac5c54df7ed3b930268c8d7752c101725">DerivedQuote< UnaryFunction ></a>, <a class="el" href="class_quant_lib_1_1_composite_quote.html#ac5c54df7ed3b930268c8d7752c101725">CompositeQuote< BinaryFunction ></a>, <a class="el" href="class_quant_lib_1_1_hybrid_heston_hull_white_process.html#ac5c54df7ed3b930268c8d7752c101725">HybridHestonHullWhiteProcess</a>, <a class="el" href="class_quant_lib_1_1_generalized_black_scholes_process.html#ac5c54df7ed3b930268c8d7752c101725">GeneralizedBlackScholesProcess</a>, <a class="el" href="class_quant_lib_1_1_fd_heston_hull_white_vanilla_engine.html#ac5c54df7ed3b930268c8d7752c101725">FdHestonHullWhiteVanillaEngine</a>, <a class="el" href="class_quant_lib_1_1_c_o_s_heston_engine.html#ac5c54df7ed3b930268c8d7752c101725">COSHestonEngine</a>, <a class="el" href="class_quant_lib_1_1_analytic_heston_hull_white_engine.html#ac5c54df7ed3b930268c8d7752c101725">AnalyticHestonHullWhiteEngine</a>, <a class="el" href="class_quant_lib_1_1_lattice_short_rate_model_engine.html#ac5c54df7ed3b930268c8d7752c101725">LatticeShortRateModelEngine< Arguments, Results ></a>, <a class="el" href="class_quant_lib_1_1_lattice_short_rate_model_engine.html#ac5c54df7ed3b930268c8d7752c101725">LatticeShortRateModelEngine< CapFloor::arguments, CapFloor::results ></a>, <a class="el" href="class_quant_lib_1_1_lattice_short_rate_model_engine.html#ac5c54df7ed3b930268c8d7752c101725">LatticeShortRateModelEngine< VanillaSwap::arguments, VanillaSwap::results ></a>, <a class="el" href="class_quant_lib_1_1_lattice_short_rate_model_engine.html#ac5c54df7ed3b930268c8d7752c101725">LatticeShortRateModelEngine< Swaption::arguments, Swaption::results ></a>, <a class="el" href="class_quant_lib_1_1_lattice_short_rate_model_engine.html#ac5c54df7ed3b930268c8d7752c101725">LatticeShortRateModelEngine< CallableBond::arguments, CallableBond::results ></a>, <a class="el" href="class_quant_lib_1_1_generic_engine.html#ac5c54df7ed3b930268c8d7752c101725">GenericEngine< ArgumentsType, ResultsType ></a>, <a class="el" href="class_quant_lib_1_1_generic_engine.html#ac5c54df7ed3b930268c8d7752c101725">GenericEngine< EnergyCommodity::arguments, EnergyCommodity::results ></a>, <a class="el" href="class_quant_lib_1_1_generic_engine.html#ac5c54df7ed3b930268c8d7752c101725">GenericEngine< HolderExtensibleOption::arguments, HolderExtensibleOption::results ></a>, <a class="el" href="class_quant_lib_1_1_generic_engine.html#ac5c54df7ed3b930268c8d7752c101725">GenericEngine< YearOnYearInflationSwap::arguments, YearOnYearInflationSwap::results ></a>, <a class="el" href="class_quant_lib_1_1_generic_engine.html#ac5c54df7ed3b930268c8d7752c101725">GenericEngine< ForwardOptionArguments< 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Arguments, Results ></a>, <a class="el" href="class_quant_lib_1_1_generic_engine.html#ac5c54df7ed3b930268c8d7752c101725">GenericEngine< CreditDefaultSwap::arguments, CreditDefaultSwap::results ></a>, <a class="el" href="class_quant_lib_1_1_generic_engine.html#ac5c54df7ed3b930268c8d7752c101725">GenericEngine< ContinuousFixedLookbackOption::arguments, ContinuousFixedLookbackOption::results ></a>, <a class="el" href="class_quant_lib_1_1_generic_engine.html#ac5c54df7ed3b930268c8d7752c101725">GenericEngine< CapFloor::arguments, CapFloor::results ></a>, <a class="el" href="class_quant_lib_1_1_generic_engine.html#ac5c54df7ed3b930268c8d7752c101725">GenericEngine< IrregularSwap::arguments, IrregularSwap::results ></a>, <a class="el" href="class_quant_lib_1_1_generic_engine.html#ac5c54df7ed3b930268c8d7752c101725">GenericEngine< IrregularSwaption::arguments, IrregularSwaption::results ></a>, <a class="el" href="class_quant_lib_1_1_generic_engine.html#ac5c54df7ed3b930268c8d7752c101725">GenericEngine< ContinuousPartialFloatingLookbackOption::arguments, ContinuousPartialFloatingLookbackOption::results ></a>, <a class="el" href="class_quant_lib_1_1_generic_engine.html#ac5c54df7ed3b930268c8d7752c101725">GenericEngine< NonstandardSwap::arguments, NonstandardSwap::results ></a>, <a class="el" href="class_quant_lib_1_1_generic_engine.html#ac5c54df7ed3b930268c8d7752c101725">GenericEngine< VanillaStorageOption::arguments, VanillaStorageOption::results ></a>, <a class="el" href="class_quant_lib_1_1_generic_engine.html#ac5c54df7ed3b930268c8d7752c101725">GenericEngine< TwoAssetCorrelationOption::arguments, TwoAssetCorrelationOption::results ></a>, <a class="el" href="class_quant_lib_1_1_generic_engine.html#ac5c54df7ed3b930268c8d7752c101725">GenericEngine< EverestOption::arguments, EverestOption::results ></a>, <a class="el" href="class_quant_lib_1_1_generic_engine.html#ac5c54df7ed3b930268c8d7752c101725">GenericEngine< HimalayaOption::arguments, HimalayaOption::results ></a>, <a class="el" href="class_quant_lib_1_1_generic_engine.html#ac5c54df7ed3b930268c8d7752c101725">GenericEngine< SpreadOption::arguments, SpreadOption::results ></a>, <a class="el" href="class_quant_lib_1_1_generic_engine.html#ac5c54df7ed3b930268c8d7752c101725">GenericEngine< MultiAssetOption::arguments, MultiAssetOption::results ></a>, <a class="el" href="class_quant_lib_1_1_generic_engine.html#ac5c54df7ed3b930268c8d7752c101725">GenericEngine< SyntheticCDO::arguments, SyntheticCDO::results ></a>, <a class="el" href="class_quant_lib_1_1_generic_engine.html#ac5c54df7ed3b930268c8d7752c101725">GenericEngine< CdsOption::arguments, CdsOption::results ></a>, <a class="el" href="class_quant_lib_1_1_generic_engine.html#ac5c54df7ed3b930268c8d7752c101725">GenericEngine< CompoundOption::arguments, CompoundOption::results ></a>, <a class="el" href="class_quant_lib_1_1_generic_engine.html#ac5c54df7ed3b930268c8d7752c101725">GenericEngine< NthToDefault::arguments, NthToDefault::results ></a>, <a class="el" href="class_quant_lib_1_1_generic_engine.html#ac5c54df7ed3b930268c8d7752c101725">GenericEngine< CliquetOption::arguments, CliquetOption::results ></a>, <a class="el" href="class_quant_lib_1_1_generic_engine.html#ac5c54df7ed3b930268c8d7752c101725">GenericEngine< FloatFloatSwaption::arguments, FloatFloatSwaption::results ></a>, <a class="el" href="class_quant_lib_1_1_generic_engine.html#ac5c54df7ed3b930268c8d7752c101725">GenericEngine< ContinuousFloatingLookbackOption::arguments, ContinuousFloatingLookbackOption::results ></a>, <a class="el" href="class_quant_lib_1_1_generic_engine.html#ac5c54df7ed3b930268c8d7752c101725">GenericEngine< PartialTimeBarrierOption::arguments, PartialTimeBarrierOption::results ></a>, <a class="el" href="class_quant_lib_1_1_generic_engine.html#ac5c54df7ed3b930268c8d7752c101725">GenericEngine< OneAssetOption::arguments, OneAssetOption::results ></a>, <a class="el" href="class_quant_lib_1_1_generic_engine.html#ac5c54df7ed3b930268c8d7752c101725">GenericEngine< DividendBarrierOption::arguments, DividendBarrierOption::results ></a>, <a class="el" href="class_quant_lib_1_1_generic_engine.html#ac5c54df7ed3b930268c8d7752c101725">GenericEngine< ComplexChooserOption::arguments, ComplexChooserOption::results ></a>, <a class="el" href="class_quant_lib_1_1_generic_engine.html#ac5c54df7ed3b930268c8d7752c101725">GenericEngine< ContinuousAveragingAsianOption::arguments, ContinuousAveragingAsianOption::results ></a>, <a class="el" href="class_quant_lib_1_1_generic_engine.html#ac5c54df7ed3b930268c8d7752c101725">GenericEngine< PathMultiAssetOption::arguments, PathMultiAssetOption::results ></a>, <a class="el" href="class_quant_lib_1_1_generic_engine.html#ac5c54df7ed3b930268c8d7752c101725">GenericEngine< VanillaSwap::arguments, VanillaSwap::results ></a>, <a class="el" href="class_quant_lib_1_1_generic_engine.html#ac5c54df7ed3b930268c8d7752c101725">GenericEngine< BarrierOption::arguments, BarrierOption::results ></a>, <a class="el" href="class_quant_lib_1_1_generic_engine.html#ac5c54df7ed3b930268c8d7752c101725">GenericEngine< VarianceOption::arguments, VarianceOption::results ></a>, <a class="el" href="class_quant_lib_1_1_generic_engine.html#ac5c54df7ed3b930268c8d7752c101725">GenericEngine< CatBond::arguments, CatBond::results ></a>, <a class="el" href="class_quant_lib_1_1_generic_engine.html#ac5c54df7ed3b930268c8d7752c101725">GenericEngine< ContinuousPartialFixedLookbackOption::arguments, ContinuousPartialFixedLookbackOption::results ></a>, <a class="el" href="class_quant_lib_1_1_generic_engine.html#ac5c54df7ed3b930268c8d7752c101725">GenericEngine< VanillaVPPOption::arguments, VanillaVPPOption::results ></a>, <a class="el" href="class_quant_lib_1_1_generic_engine.html#ac5c54df7ed3b930268c8d7752c101725">GenericEngine< FloatFloatSwap::arguments, FloatFloatSwap::results ></a>, <a class="el" href="class_quant_lib_1_1_generic_engine.html#ac5c54df7ed3b930268c8d7752c101725">GenericEngine< ConvertibleBond::option::arguments, ConvertibleBond::option::results ></a>, <a class="el" href="class_quant_lib_1_1_generic_engine.html#ac5c54df7ed3b930268c8d7752c101725">GenericEngine< Swaption::arguments, Swaption::results ></a>, <a class="el" href="class_quant_lib_1_1_generic_engine.html#ac5c54df7ed3b930268c8d7752c101725">GenericEngine< YoYInflationCapFloor::arguments, YoYInflationCapFloor::results ></a>, <a class="el" href="class_quant_lib_1_1_generic_engine.html#ac5c54df7ed3b930268c8d7752c101725">GenericEngine< CallableBond::arguments, CallableBond::results ></a>, <a class="el" href="class_quant_lib_1_1_generic_engine.html#ac5c54df7ed3b930268c8d7752c101725">GenericEngine< WriterExtensibleOption::arguments, WriterExtensibleOption::results ></a>, <a class="el" href="class_quant_lib_1_1_generic_engine.html#ac5c54df7ed3b930268c8d7752c101725">GenericEngine< DiscreteAveragingAsianOption::arguments, DiscreteAveragingAsianOption::results ></a>, <a class="el" href="class_quant_lib_1_1_generic_engine.html#ac5c54df7ed3b930268c8d7752c101725">GenericEngine< VanillaOption::arguments, VanillaOption::results ></a>, <a class="el" href="class_quant_lib_1_1_generic_engine.html#ac5c54df7ed3b930268c8d7752c101725">GenericEngine< TwoAssetBarrierOption::arguments, TwoAssetBarrierOption::results ></a>, <a class="el" href="class_quant_lib_1_1_generic_engine.html#ac5c54df7ed3b930268c8d7752c101725">GenericEngine< Swap::arguments, Swap::results ></a>, <a class="el" href="class_quant_lib_1_1_generic_engine.html#ac5c54df7ed3b930268c8d7752c101725">GenericEngine< NonstandardSwaption::arguments, NonstandardSwaption::results ></a>, <a class="el" href="class_quant_lib_1_1_generic_engine.html#ac5c54df7ed3b930268c8d7752c101725">GenericEngine< Bond::arguments, Bond::results 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<h2 class="memtitle"><span class="permalink"><a href="#a3d53f9669c128dadc74a5d044a7c8e68">◆ </a></span>deepUpdate()</h2>
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<td class="memname">void deepUpdate </td>
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<p>This method allows to explicitly update the instance itself and nested observers. If notifications are disabled a call to this method ensures an update of such nested observers. It should be implemented in derived classes whenever applicable </p>
<p>Reimplemented in <a class="el" href="class_quant_lib_1_1_stripped_optionlet_adapter.html#a3d53f9669c128dadc74a5d044a7c8e68">StrippedOptionletAdapter</a>, <a class="el" href="class_quant_lib_1_1_swap.html#a3d53f9669c128dadc74a5d044a7c8e68">Swap</a>, <a class="el" href="class_quant_lib_1_1_composite_instrument.html#a3d53f9669c128dadc74a5d044a7c8e68">CompositeInstrument</a>, <a class="el" href="class_quant_lib_1_1_cap_floor.html#a3d53f9669c128dadc74a5d044a7c8e68">CapFloor</a>, and <a class="el" href="class_quant_lib_1_1_bond.html#a3d53f9669c128dadc74a5d044a7c8e68">Bond</a>.</p>
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