First of all, thank you for your contributions. Indeed it was a greatly useful library with very detailed documentation.

While trying to run a sample example code "line_interpolate" from following link:

There is an error that appears saying " error: ‘line_interpolate’ was not declared in this scope" but i dint understand the reason.

While other examples from the reference(https://www.boost.org/doc/libs/1_79_0/libs/geometry/doc/html/geometry/matrix.html), work fine without any issues. 

May I know the actual cause of this issue?

Working platform: Ubuntu 18.04

Boost Version:  1.65.1.0