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Showing content from http://en.cppreference.com/w/cpp/../cpp/error/../experimental/optional/value.html below:

std::experimental::optional<T>::value - cppreference.com

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

(1) (library fundamentals TS)

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

(2) (library fundamentals TS)

Returns the contained value.

1) Equivalent to return bool(*this) ? *val : throw bad_optional_access();.

2) Equivalent to return bool(*this) ? std::move(*val) : throw bad_optional_access();.

[edit] Parameters

(none)

[edit] Return value

A reference to the contained value.

[edit] Exceptions

std::experimental::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

Possible output:

optional<T>::value: not engaged
[edit] See also returns the contained value if available, another value otherwise
(public member function) [edit] accesses the contained value
(public member function) [edit]

(library fundamentals TS)

exception indicating checked access to an optional that doesn't contain a value
(class) [edit]

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