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pair	http://en.cppreference.com/cpp/utility/pair
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optional	http://en.cppreference.com/cpp/utility/optional
any	http://en.cppreference.com/cpp/utility/any
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[edit]	https://cppreference.com/index.php?title=Template:cpp/utility/navbar_content&action=edit
std::optional	http://en.cppreference.com/cpp/utility/optional
Member functions	http://en.cppreference.com/cpp/utility/optional#Member_functions
optional::optional	http://en.cppreference.com/cpp/utility/optional/optional
optional::~optional	http://en.cppreference.com/cpp/utility/optional/~optional
optional::operator=	http://en.cppreference.com/cpp/utility/optional/operator%3D
Observers	http://en.cppreference.com/cpp/utility/optional#Observers
optional::operator->optional::operator*	http://en.cppreference.com/cpp/utility/optional/operator*
optional::operator booloptional::has_value	http://en.cppreference.com/cpp/utility/optional/operator_bool
optional::value	http://en.cppreference.com/cpp/utility/optional/value
optional::value_or	http://en.cppreference.com/cpp/utility/optional/value_or
Iterators	http://en.cppreference.com/cpp/utility/optional#Iterators
optional::begin	http://en.cppreference.com/cpp/utility/optional/begin
optional::end	http://en.cppreference.com/cpp/utility/optional/end
Monadic operations	http://en.cppreference.com/cpp/utility/optional#Monadic_operations
optional::and_then	http://en.cppreference.com/cpp/utility/optional/and_then
optional::or_else	http://en.cppreference.com/cpp/utility/optional/or_else
Modifiers	http://en.cppreference.com/cpp/utility/optional#Modifiers
optional::emplace	http://en.cppreference.com/cpp/utility/optional/emplace
optional::swap	http://en.cppreference.com/cpp/utility/optional/swap
optional::reset	http://en.cppreference.com/cpp/utility/optional/reset
Non-member functions	http://en.cppreference.com/cpp/utility/optional#Non-member_functions
operator==operator!=operatoroperator>=operator<=>	http://en.cppreference.com/cpp/utility/optional/operator_cmp
make_optional	http://en.cppreference.com/cpp/utility/optional/make_optional
swap(std::optional)	http://en.cppreference.com/cpp/utility/optional/swap2
Deduction guides	http://en.cppreference.com/cpp/utility/optional/deduction_guides
Helper classes	http://en.cppreference.com/cpp/utility/optional#Helper_classes
hash	http://en.cppreference.com/cpp/utility/optional/hash
nullopt_t	http://en.cppreference.com/cpp/utility/optional/nullopt_t
in_place_t	http://en.cppreference.com/cpp/utility/in_place
bad_optional_access	http://en.cppreference.com/cpp/utility/optional/bad_optional_access
Helper objects	http://en.cppreference.com/cpp/utility/optional#Helpers
nullopt	http://en.cppreference.com/cpp/utility/optional/nullopt
in_place	http://en.cppreference.com/cpp/utility/in_place
[edit]	https://cppreference.com/index.php?title=Template:cpp/utility/optional/navbar_content&action=edit
direct-initialized	http://en.cppreference.com/cpp/language/direct_initialization
and_then()	http://en.cppreference.com/cpp/utility/optional/and_then
1 Parameters	http://en.cppreference.com/cpp/utility/optional/transform#Parameters
2 Return value	http://en.cppreference.com/cpp/utility/optional/transform#Return_value
3 Notes	http://en.cppreference.com/cpp/utility/optional/transform#Notes
4 Example	http://en.cppreference.com/cpp/utility/optional/transform#Example
5 See also	http://en.cppreference.com/cpp/utility/optional/transform#See_also
Callable	http://en.cppreference.com/cpp/named_req/Callable
pointer to data member	http://en.cppreference.com/cpp/language/pointer#Pointers_to_data_members
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202110L	http://en.cppreference.com/cpp/compiler_support/23#cpp_lib_optional_202110L
Monadic operations	http://en.cppreference.com/cpp/utility/optional#Monadic_operations
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