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

get coordinate value of a Box or Segment

The free functions **get** and **set** are two of the most important functions of
Boost.Geometry, both within the library, as also for the library user.
With these two functions you normally get and set coordinate values from
and for a point, box, segment or sphere.

template<std::size_t Index, std::size_t Dimension, typename Geometry> coordinate_type<Geometry>::type get(Geometry const & geometry)

Type |
Concept |
Name |
Description |
---|---|---|---|

Index |
Index, this template parameter is required. For a Box: either min_corner or max_corner. For a Segment: either 0 or 1 for first or last point. |
- |
Must be specified |

Dimension |
Dimension, this template parameter is required. Should contain [0 .. n-1] for an n-dimensional geometry |
- |
Must be specified |

Geometry const & |
Any type fulfilling a Box Concept or a Segment Concept |
geometry |
A model of the specified concept |

coordinate value

Either

`#include <boost/geometry.hpp>`

Or

`#include <boost/geometry/core/access.hpp>`

Case |
Behavior |
---|---|

Box |
Returns the coordinate of a box (use min_corner, max_corner to specify which of the points to get) |

Segment |
Returns the coordinate of a segment (use 0, 1 to specify which of the two points to get) |

Constant

Get the coordinate of a box

#include <iostream> #include <boost/geometry.hpp> #include <boost/geometry/geometries/point_xy.hpp> namespace bg = boost::geometry; int main() { bg::model::box<bg::model::d2::point_xy<double> > box; bg::assign_values(box, 1, 3, 5, 6); std::cout << "Box:" << " " << bg::get<bg::min_corner, 0>(box) << " " << bg::get<bg::min_corner, 1>(box) << " " << bg::get<bg::max_corner, 0>(box) << " " << bg::get<bg::max_corner, 1>(box) << std::endl; return 0; }

Output:

Box: 1 3 5 6