Meeting C++ Community Survey

Which classic design patterns do you use?

FactoryBuilderPrototypeSingletonAdapterBridgeCompositeDecoratorFacadeFlyweightProxyChain of responsibilityCommandInterpreterIteratorMediatorMementoObserverStateStrategyTemplate methodVisitor

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auto x = 4;
auto y = 3;
auto a= x + y;
std::cout << ++y + x + x;

What value is a?*

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