Boost C++ Libraries

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

boost::typed_identity_property_map<T>

typedef boost::typed_identity_propoperty_map<std::size_t> boost::identity_property_map

The typed_identity_property_map property map applies the identity function, that is, it just returns a copy of the key object that was input. The key and value types are both the same as the template parameter T. The identity_property_map name is for the common case where the key and value type are std::size_t (this name is deprecated for use within Boost.Graph).

Note: Previously the function get() and operator[] for identity_property_map were overloaded to return a copy of keys of any type, i.e., not just size_t. These overloads are now deprecated, because they did not adhere to the property map concepts.

Where Defined

boost/property_map/property_map.hpp

Model of

Readable Property Map

Template Parameters

Parameter	Description	Default
`T`	Must be Copy Contructible

Associated Types

Type	Description
`boost::property_traits<typed_identity_property_map<T> >::value_type`	This type is `T`.
`boost::property_traits<typed_identity_property_map<T> >::key_type`	This type is `T`.
`boost::property_traits<typed_identity_property_map<T> >::reference`	This type is `T`..
`boost::property_traits<typed_identity_property_map<T> >::category`	This type is `boost::readable_property_map_tag`.

Member Functions

Member	Description
`typed_identity_property_map()`	Default constructor.
`typed_identity_property_map(const typed_identity_property_map<T>& x)`	Copy constructor.
`T operator[](const T& x) const`	Returns a copy of object `x`.

Non-Member Functions

Member	Description
`T get(const typed_identity_property_map<T>& pmap, const T& x)`	Returns a copy of object `x`.

Jeremy Siek, Univ.of Notre Dame (jsiek@lsc.nd.edu)
Lie-Quan Lee, Univ. of Notre Dame (llee1@lsc.nd.edu)
Andrew Lumsdaine, Univ.of Notre Dame (lums@lsc.nd.edu)
Alex Hagen-Zanker