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#include <boost/graph/adjacency_list.hpp>
 
struct TreeVertex
{
    int _id = -1;
};
 
typedef boost::adjacency_list<
	boost::vecS,
	boost::vecS,
	boost::directedS,
	TreeVertex
	> tree_t;
//typedef typename boost::graph_traits<tree_t>::vertex_descriptor vertex_t;
 
int main() {
    tree_t tree;
	auto v1 = boost::add_vertex( tree );	
	auto v2 = boost::add_vertex( tree );	
	auto v3 = boost::add_vertex( tree );	
	boost::add_edge( v1, v2, tree );
	boost::add_edge( v2, v3, tree );
 
	auto pair_it_edge = boost::in_edges( v2, tree );	
}
 

prog.cpp: In function 'int main()':
prog.cpp:24:48: error: no matching function for call to 'in_edges(unsigned int&, tree_t&)'
  auto pair_it_edge = boost::in_edges( v2, tree ); 
                                                ^
In file included from /usr/include/boost/graph/adjacency_list.hpp:246:0,
                 from prog.cpp:1:
/usr/include/boost/graph/detail/adjacency_list.hpp:1051:5: note: candidate: template<class Config> std::pair<typename Config::in_edge_iterator, typename Config::in_edge_iterator> boost::in_edges(typename Config::vertex_descriptor, const boost::undirected_graph_helper<C>&)
     in_edges(typename Config::vertex_descriptor u,
     ^
/usr/include/boost/graph/detail/adjacency_list.hpp:1051:5: note:   template argument deduction/substitution failed:
prog.cpp:24:48: note:   'tree_t {aka boost::adjacency_list<boost::vecS, boost::vecS, boost::directedS, TreeVertex>}' is not derived from 'const boost::undirected_graph_helper<C>'
  auto pair_it_edge = boost::in_edges( v2, tree ); 
                                                ^
In file included from /usr/include/boost/graph/adjacency_list.hpp:246:0,
                 from prog.cpp:1:
/usr/include/boost/graph/detail/adjacency_list.hpp:1124:5: note: candidate: template<class Config> std::pair<typename Config::in_edge_iterator, typename Config::in_edge_iterator> boost::in_edges(typename Config::vertex_descriptor, const boost::bidirectional_graph_helper<C>&)
     in_edges(typename Config::vertex_descriptor u,
     ^
/usr/include/boost/graph/detail/adjacency_list.hpp:1124:5: note:   template argument deduction/substitution failed:
prog.cpp:24:48: note:   'tree_t {aka boost::adjacency_list<boost::vecS, boost::vecS, boost::directedS, TreeVertex>}' is not derived from 'const boost::bidirectional_graph_helper<C>'
  auto pair_it_edge = boost::in_edges( v2, tree ); 
                                                ^

Standard output is empty