Boost C++ Libraries of the most highly regarded and expertly designed C++ library projects in the world. Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

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const value_type &value() const &

Wide contract const lvalue reference observer of any value present. NoValuePolicy::wide_value_check() is first invoked, then the reference to the value is returned.

Note that if value_type is void, only a const overload returning void is present.

Requires: Always available.

Complexity: Depends on NoValuePolicy::wide_value_check().

Guarantees: None.

Last revised: February 12, 2019 at 16:36:24 UTC

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