Function Property Map Adaptor

##

    function_property_map<UnaryFunction, Key, Ref>

This property map is an adaptor that converts a function object into either a Readable Property Map or a Lvalue Property Map. The category of the property map is based on whether the function's return type (as given by `Ref`) is a non-const reference type.

### Where Defined

`boost/property_map/function_property_map.hpp`

### Model Of

Readable Property Map or Lvalue Property Map

### Template Parameters

Parameter | Description | Default
--- | --- | ---
`UnaryFunction` | Must be a model of Unary Function that accepts an object of type `Key` as an argument and returns a result of type `Ref`. |
`Key` | The key type of the property map. |
`Ref` | The result type of the function. | `boost::result_of<const UnaryFunction(const Key&)>::type`

### Members

In addition to the methods and functions required by Readable Property Map or Lvalue Property Map, this class has the following members:

    property_traits<function_property_map>::value_type

The type `Ref` with any reference or cv-qualifiers removed.

    function_property_map(const UnaryFunction& f = UnaryFunction())

Constructor.

### Non-Member functions

      template <class Key, class UnaryFunction>
      function_property_map<UnaryFunction, Key>
      make_function_property_map(const UnaryFunction& f);

Returns a `function_property_map` using the given function and key type.

      template <class Key, class Ref, class UnaryFunction>
      function_property_map<UnaryFunction, Key, Ref>
      make_function_property_map(const UnaryFunction& f);

Returns a `function_property_map` using the given function and key and reference types.

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