Boost C++ Libraries

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Boost.Fusion

Boost.Fusion adapted structs or classes are adapted to the Boost.Geometry point concept

Description

Boost.Fusion adapted structs are (optionally) adapted to the Boost.Geometry point concept. They can therefore be used in many Boost.Geometry algorithms.

Model of

`#include <boost/geometry/geometries/adapted/boost_fusion.hpp>`

The standard header `boost/geometry.hpp` does not include this header.

Example

Shows how to combine Boost.Fusion with Boost.Geometry

```#include <iostream>

#include <boost/geometry.hpp>

struct sample_point
{
double x, y, z;
};

BOOST_FUSION_ADAPT_STRUCT(sample_point, (double, x) (double, y) (double, z))
BOOST_GEOMETRY_REGISTER_BOOST_FUSION_CS(cs::cartesian)

int main()
{
sample_point a, b, c;

// Set coordinates the Boost.Geometry way (one of the ways)
boost::geometry::assign_values(a, 3, 2, 1);

// Set coordinates the Boost.Fusion way
boost::fusion::at_c<0>(b) = 6;
boost::fusion::at_c<1>(b) = 5;
boost::fusion::at_c<2>(b) = 4;

// Set coordinates the native way
c.x = 9;
c.y = 8;
c.z = 7;

std::cout << "Distance a-b: " << boost::geometry::distance(a, b) << std::endl;
std::cout << "Distance a-c: " << boost::geometry::distance(a, c) << std::endl;

return 0;
}
```

Output:

```Distance a-b: 5.19615
Distance a-c: 10.3923
```