Boost.Optional

This is an older version of Boost and was released in 2018. The current version is 1.89.0.

C++ 03 Added in Boost 1.30.0

Categories: Data

A value-semantic, type-safe wrapper for representing 'optional' (or 'nullable') objects of a given type. An optional object may or may not contain a value of the underlying type.

Documentation www.boost.org/doc/libs/1_68_0/libs/optional/index.html

GitHub Issues github.com/boostorg/optional/issues

Source Code github.com/boostorg/optional/tree/boost-1.68.0

This Release

Fernando Cacciola

Author

Andrzej Krzemieński

Maintainer

Dependencies

Assert

Config

Core

Detail

Move

MPL

Predef

Static Assert

ThrowException

Type Traits

Utility

Added

Predef

optional

A library for representing optional (nullable) objects in C++.

optional<int> readInt(); // this function may return either an int or a not-an-int

if (optional<int> oi = readInt()) // did I get a real int
  cout << "my int is: " << *oi;   // use my int
else
  cout << "I have no int";

For more information refer to the documentation provided with this library.