edges_to_graph.hpp

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#ifndef SCRAN_GRAPH_CLUSTER_EDGES_TO_GRAPH_HPP
#define SCRAN_GRAPH_CLUSTER_EDGES_TO_GRAPH_HPP
 
#include <cstddef>
 
#include "raiigraph/raiigraph.hpp"
#include "sanisizer/sanisizer.hpp"
 
#include "igraph.h"
 
namespace scran_graph_cluster {
 
template<typename Vertex_>
raiigraph::Graph edges_to_graph(const std::size_t double_edges, const Vertex_* const edges, const std::size_t num_vertices, const bool directed) {
    raiigraph::initialize();
 
    // Make sure signature doesn't require any igraph-related types, as these
    // might not be usable before the library is initialized.
    const auto actual_directed = (directed ? IGRAPH_DIRECTED : IGRAPH_UNDIRECTED);
 
    if constexpr(std::is_same<Vertex_, igraph_int_t>::value) {
        const auto edge_view = igraph_vector_int_view(edges, sanisizer::cast<igraph_int_t>(double_edges));
        return raiigraph::Graph(&edge_view, num_vertices, actual_directed);
    } else {
        auto tmp = sanisizer::create<raiigraph::IntegerVector>(double_edges);
        auto& payload = *(tmp.get());
        for (std::size_t x = 0; x < double_edges; ++x) {
            VECTOR(payload)[x] = edges[x];
        }
        return raiigraph::Graph(tmp, num_vertices, actual_directed);
    }
}
 
}
 
#endif