CGAL 4.7 - CGAL and Boost Property Maps: CGAL::Nth_of_tuple_property_map< N, Tuple > Struct Template Reference

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CGAL 4.7 - CGAL and Boost Property Maps

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CGAL::Nth_of_tuple_property_map< N, Tuple > Struct Template Reference
CGAL and Boost Property Maps Reference

`#include <CGAL/property_map.h>`

## Definition

Property map that accesses the Nth item of a `boost::tuple`.

Template Parameters

  N | Index of the item to access.
  Tuple | Instance of `boost::tuple`.

Is Model Of:
  `LvaluePropertyMap`

Examples:
  Point_set_processing_3/average_spacing_example.cpp, and Point_set_processing_3/property_map.cpp.

## Public Types

typedef Tuple | key_type
| typedef to `Tuple`
typedef boost::tuples::element < N, Tuple >::type | value_type
| typedef to `boost::tuples::element<N,Tuple>::type`
typedef value_type & | reference
| typedef to `value_type&`
typedef boost::lvalue_property_map_tag | category
| `boost::lvalue_property_map_tag`
typedef Nth_of_tuple_property_map< N, Tuple > | Self

## Public Member Functions

reference | operator[] (key_type &tuple) const
| Access a property map element. More...

## Related Functions

(Note that these are not member functions.)
template<int N, class Tuple >
Nth_of_tuple_property_map< N, Tuple > | make_nth_of_tuple_property_map (Tuple)
| Free function to create a Nth_of_tuple_property_map property map.

## Put/get free functions

const value_type & | get (const Self &, const key_type &k)
reference | get (const Self &, key_type &k)
void | put (const Self &, key_type &k, const value_type &v)

## Member Function Documentation

template<int N, typename Tuple >

reference CGAL::Nth_of_tuple_property_map< N, Tuple >::operator[] | ( | key_type & | tuple) |  | const

Access a property map element.

Parameters

  tuple | a key whose Nth item is accessed