PG Database + "The Boost Graph Library (BGL)" C++ ( https://www.boost.org/doc/libs/1_87_0/libs/graph/doc/index.h... )+ PostGIS ==> PGRouting

Just check the Workshop : https://workshop.pgrouting.org/3.0/en/index.html

Pedestrian Routing:

https://workshop.pgrouting.org/3.0/en/basic/pedestrian.html#...

Graph views:

https://workshop.pgrouting.org/3.0/en/basic/graph_views.html

Create a Network Topology:

https://workshop.pgrouting.org/3.0/en/advanced/chapter-12.ht...