mesh_point(gf_mesh<imfreq> const &mesh) : mesh_point(mesh, mesh.first_index_window()) {}
mesh_point(gf_mesh<imfreq> const &mesh, index_t const &index_) : matsubara_freq(index_, mesh.domain().beta, mesh.domain().statistic) , first_index_window(mesh.first_index_window()) , last_index_window(mesh.last_index_window()) {}