CGAL 4.7 - 2D and Surface Function Interpolation: CGAL::Data_access< Map > Struct Template Reference

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CGAL 4.7 - 2D and Surface Function Interpolation

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CGAL::Data_access< Map > Struct Template Reference
2D and Surface Function Interpolation Reference

`#include <CGAL/interpolation_functions.h>`

## Inherits from

unary_function< Map::key_type, std::pair< Map::mapped_type, bool > >.

## Definition

The struct `Data_access` implements a functor that allows to retrieve data from an associative container.

The functor keeps a reference to the container. Given an instance of the container's key type, it returns a pair of the container's value type and a Boolean indicating whether the retrieval was successful.

This class can be used to provide the values and gradients of the interpolation functions.

Parameters

The class `Data_access` has the container type `Map` as template parameter.

Examples:
  Interpolation/linear_interpolation_2.cpp, and Interpolation/sibson_interpolation_2.cpp.

## Types

typedef Map::mapped_type | Data_type
typedef Map::key_type | Key_type

## Creation

| Data_access (const Map &map)
| Introduces a `Data_access` to the container `map`.
std::pair< Data_type, bool > | operator() (const Key_type &p)
| If there is an entry for `p` in the container `map`, then the pair of `map.find(p)` and `true` is returned. More...

## Member Function Documentation

template<typename Map >

std::pair< Data_type, bool> CGAL::Data_access< Map >::operator() | ( | const Key_type & | p) |  |

If there is an entry for `p` in the container `map`, then the pair of `map.find(p)` and `true` is returned.

Otherwise, the Boolean value of the pair is `false`.