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optional::optionalhttps://en.cppreference.com/cpp/experimental/optional/optional
optional::~optionalhttps://en.cppreference.com/cpp/experimental/optional/~optional
optional::operator=https://en.cppreference.com/cpp/experimental/optional/operator%3D
optional::operator->optional::operator*https://en.cppreference.com/cpp/experimental/optional/operator*
optional::operator boolhttps://en.cppreference.com/cpp/experimental/optional/operator_bool
optional::valuehttps://en.cppreference.com/cpp/experimental/optional/value
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std::optionalhttps://en.cppreference.com/cpp/utility/optional
https://en.cppreference.com/cpp/header/experimental/optional
contextually converted to boolhttps://en.cppreference.com/cpp/language/implicit_cast
1 Template parametershttps://en.cppreference.com/cpp/experimental/optional#Template_parameters
2 Member typeshttps://en.cppreference.com/cpp/experimental/optional#Member_types
3 Member functionshttps://en.cppreference.com/cpp/experimental/optional#Member_functions
3.1 Observershttps://en.cppreference.com/cpp/experimental/optional#Observers
3.2 Modifiershttps://en.cppreference.com/cpp/experimental/optional#Modifiers
4 Member objectshttps://en.cppreference.com/cpp/experimental/optional#Member_objects
5 Non-member functionshttps://en.cppreference.com/cpp/experimental/optional#Non-member_functions
6 Helper classeshttps://en.cppreference.com/cpp/experimental/optional#Helper_classes
7 Helper objectshttps://en.cppreference.com/cpp/experimental/optional#Helper_objects
Destructiblehttps://en.cppreference.com/cpp/named_req/Destructible
(constructor)https://en.cppreference.com/cpp/experimental/optional/optional
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