std::experimental::optional<T>::operator->,std::experimental::optional<T>::operator* (3) - Linux Manuals

std::experimental::optional<T>::operator->,std::experimental::optional<T>::operator*: std::experimental::optional<T>::operator->,std::experimental::optional<T>::operator*


std::experimental::optional<T>::operator->,std::experimental::optional<T>::operator* - std::experimental::optional<T>::operator->,std::experimental::optional<T>::operator*


constexpr const T* operator->() const; (1) (library fundamentals TS)
constexpr T* operator->(); (1) (library fundamentals TS)
constexpr const T& operator*() const&; (2) (library fundamentals TS)
constexpr T& operator*() &; (2) (library fundamentals TS)
constexpr const T&& operator*() const&&; (2) (library fundamentals TS)
constexpr T&& operator*() &&; (2) (library fundamentals TS)

Accesses the contained value.
1) Returns a pointer to the contained value.
2) Returns a reference to the contained value.
The behavior is undefined if *this does not contain a value



Return value

Pointer or reference to the contained value.




This operator does not check whether the optional contains a value. If checked access is needed, value() or value_or() may be used.


// Run this code

  #include <experimental/optional>
  #include <iostream>
  #include <string>
  using namespace std::literals;
  int main()
      std::experimental::optional<int> opt1 = 1;
      std::cout << *opt1 << '\n';

      std::experimental::optional<std::string> opt2 = "abc"s;
      std::cout << opt2->size() << '\n';



See also

         returns the contained value
value (public member function)
         returns the contained value if available, another value otherwise
value_or (public member function)