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Showing content from https://en.cppreference.com/w/cpp/algorithm/../ranges/../utility/optional/value.html below:

constexpr T& value() &; constexpr const T& value() const &;

(1) (since C++17)

constexpr T&& value() &&; constexpr const T&& value() const &&;

(2) (since C++17)

If *this contains a value, returns a reference to the contained value.

Otherwise, throws a std::bad_optional_access exception.

[edit] Parameters

(none)

[edit] Return value

A reference to the contained value.

[edit] Exceptions

std::bad_optional_access if *this does not contain a value.

[edit] Notes

The dereference operator operator*() does not check if this optional contains a value, which may be more efficient than value().

[edit] Example

Output:

bad optional access
bad optional access
43
44

[edit] See also

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