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Calculates the buffer of a geometry.
The free function buffer calculates the buffer (a polygon being the spatial point set collection within a specified maximum distance from a geometry) of a geometry.
template<typename Input, typename Output, typename Distance> void buffer(Input const & geometry_in, Output & geometry_out, Distance const & distance, Distance const & chord_length = -1)
| Type | Concept | Name | Description | 
|---|---|---|---|
| Input const & | Any type fulfilling a Geometry Concept | geometry_in | A model of the specified concept | 
| Output & | Any type fulfilling a Geometry Concept | geometry_out | A model of the specified concept | 
| Distance const & | numerical type (int, double, ttmath, ...) | distance | The distance to be used for the buffer | 
| Distance const & | numerical type (int, double, ttmath, ...) | chord_length | (optional) The length of the chord's in the generated arcs around points or bends | 
Either
            #include <boost/geometry.hpp>
          
Or
            #include <boost/geometry/algorithms/buffer.hpp>
          
The function buffer implements function Buffer from the OGC Simple Feature Specification.
| ![[Note]](../../../../../../../../doc/src/images/note.png) | Note | 
|---|---|
| The current implemetation only enlarges a box, which is not defined by OGC. A next version of the library will contain a more complete implementation | 
| Case | Behavior | 
|---|---|
| Box/Box | Returns a new rectangular box, enlarged with the specified distance. It is allowed that "geometry_out" the same object as "geometry_in" |