std::experimental::optional::value

 

C++

Language

Standard library headers

Concepts

Utilities library

Strings library

Containers library

Algorithms library

Iterators library

Numerics library

Input/output library

Localizations library

Regular expressions library (C++11)

Atomic operations library (C++11)

Thread support library (C++11)

 

Experimental libraries

Experimental standard libraries

optional (library fundamentals TS)

any (library fundamentals TS)

basic_string_view (library fundamentals TS)

Polymorphic allocator library (library fundamentals TS)

Filesystem library (filesystem TS)

 

std::experimental::optional

Member functions

optional::optional

optional::~optional

optional::operator=

Observers

optional::operator->optional::operator*

optional::operator bool

optional::value

optional::value_or

Modifiers

optional::emplace

optional::swap

Non-member functions

operator==operator<

make_optional

swap

Helper classes

hash

 

constexpr const T& value() const;		(library fundamentals TS)
T& value();		(library fundamentals TS)

Returns the contained value.

Parameters

(none)

Return value

A reference to the contained value.

Exceptions

std::bad_optional_access if *this is in disengaged state.

See also

value_or

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