##

    const_associative_property_map<UniquePairAssociativeContainer>

This property map is an adaptor that converts any type that is a model of both Pair Associative Container and Unique Associative Container such as `std::map` into a constant Lvalue Property Map. Note that the adaptor only retains a reference to the container, so the lifetime of the container must encompass the use of the adaptor.

### Example

example1.cpp:

    #include <iostream>
    #include <map>
    #include <string>
    #include <boost/property_map.hpp>

    template <typename ConstAddressMap>
    void display(ConstAddressMap address)
    {
      typedef typename boost::property_traits<ConstAddressMap>::value_type
        value_type;
      typedef typename boost::property_traits<ConstAddressMap>::key_type key_type;

      key_type fred = "Fred";
      key_type joe = "Joe";

      value_type freds_address = get(address, fred);
      value_type joes_address = get(address, joe);

      std::cout << fred << ": " << freds_address << "\n"
    	    << joe  << ": " << joes_address  << "\n";
    }

    int
    main()
    {
      std::map<std::string, std::string> name2address;
      boost::const_associative_property_map< std::map<std::string, std::string> >
        address_map(name2address);

      name2address.insert(make_pair(std::string("Fred"),
    				std::string("710 West 13th Street")));
      name2address.insert(make_pair(std::string("Joe"),
    				std::string("710 West 13th Street")));

      display(address_map);

      return EXIT_SUCCESS;
    }

### Where Defined

`boost/property_map.hpp`

### Model Of

Lvalue Property Map

### Template Parameters

Parameter | Description | Default
--- | --- | ---
`UniquePairAssociativeContainer` | Must be a model of both Pair Associative Container and Unique Associative Container . |

### Members

In addition the methods and functions required by Lvalue Property Map, this class has the following members.

    property_traits<const_associative_property_map>::value_type

This is the same type as `UniquePairAssociativeContainer::data_type`.

    const_associative_property_map()

Default Constructor.

    const_associative_property_map(const UniquePairAssociativeContainer& c)

Constructor.

    const data_type& operator[](const key_type& k) const

The operator bracket for property access. The `key_type` and `data_type` types are from the typedefs inside of `UniquePairAssociativeContainer`.

### Non-Member functions

      template <typename UniquePairAssociativeContainer>
      const_associative_property_map<UniquePairAssociativeContainer>
      make_assoc_property_map(const UniquePairAssociativeContainer& c);

A function for conveniently creating an associative property map.

Copyright © 2002 | Jeremy Siek, Indiana University (jsiek@osl.iu.edu) Lie-Quan Lee, Indiana University (llee1@osl.iu.edu) Andrew Lumsdaine, Indiana University (lums@osl.iu.edu)