// a simple function to get the number of blocks
template <typename T> size_t n_blocks(gf<block_index, T> const &g) { return g.mesh().size(); }
template <typename M, typename T, typename S, typename E> gf<M, real_target_t<T>, S> real(gf<M, T, S, E> const &g) {
return {g.mesh(), real(g.data()), g.singularity(), g.symmetry(), {}, {}};
}
gf<block_index,std14::result_of_t<F(G)>> map(F && f, gf<block_index,G> const & g) {
return make_block_gf(map(f, g.data()));
}
/// Build the block function made of f(b) if b are the blocks of g
template <typename F, typename G> gf<block_index, std14::result_of_t<F(G)>> map(F &&f, gf<block_index, G> const &g) {
return make_block_gf(get_block_names(g), _map(f, g.data()));
}