C++ group类代码示例

std::string to_string(const group& x) {
  if (x == invalid_group)
    return "<invalid-group>";
  std::string result = x.get()->module().name();
  result += ":";
  result += x.get()->identifier();
  return result;
}

void local_actor::leave(const group& what) {
  CAF_LOG_TRACE(CAF_TSARG(what));
  if (what == invalid_group) {
    return;
  }
  if (detach(abstract_group::subscription_token{what.ptr()}) > 0) {
    what->unsubscribe(address());
  }
}

bool search_reqs( group gp, const std::string &txt )
{
    return std::any_of( gp.begin(), gp.end(), [&]( const typename group::value_type & opts ) {
        return std::any_of( opts.begin(),
        opts.end(), [&]( const typename group::value_type::value_type & e ) {
            return lcmatch( e.to_string(), txt );
        } );
    } );
}

 /// Causes this actor to subscribe to the group `what`.
 /// The group will be unsubscribed if the actor finishes execution.
 void join(const group& what) {
   CAF_LOG_TRACE(CAF_ARG(what));
   if (what == invalid_group)
     return;
   if (what->subscribe(dptr()->ctrl()))
     subscriptions_.emplace(what);
 }

void local_actor::join(const group& what) {
    CPPA_LOG_TRACE(CPPA_TSARG(what));
    if (what && m_subscriptions.count(what) == 0) {
        CPPA_LOG_DEBUG("join group: " << to_string(what));
        m_subscriptions.insert(std::make_pair(what, what->subscribe(this)));
    }
}

error inspect(serializer& f, group& x) {
  std::string mod_name;
  auto ptr = x.get();
  if (!ptr)
    return f(mod_name);
  mod_name = ptr->module().name();
  auto e = f(mod_name);
  return e ? e : ptr->save(f);
}

inline void group::open(group const& other, std::string const& name)
{
    if (hid_ >= 0) {
        throw error("h5xx::group object is already in use");
    }

    if (exists_group(other, name)) {
        hid_ = H5Gopen(other.hid(), name.c_str(), H5P_DEFAULT);
    }
    else {
        hid_t lcpl_id = H5Pcreate(H5P_LINK_CREATE);     // create group creation property list
        H5Pset_create_intermediate_group(lcpl_id, 1);   // set intermediate link creation
        hid_ = H5Gcreate(other.hid(), name.c_str(), lcpl_id, H5P_DEFAULT, H5P_DEFAULT);
    }
    if (hid_ < 0){
        throw error("creating or opening group \"" + name + "\"");
    }
}

/**
 * return true if group "name" exists in group "grp"
 */
inline bool exists_group(group const& grp, std::string const& name)
{
    hid_t hid = grp.hid();
    H5E_BEGIN_TRY {
        hid = H5Gopen(hid, name.c_str(), H5P_DEFAULT);
        if (hid > 0) {
            H5Gclose(hid);
        }
    } H5E_END_TRY
    return (hid > 0);
}

 void h5_write(group g, std::string const& name, std::string const& value) {

  datatype strdatatype = H5Tcopy(H5T_C_S1);
  // auto status = H5Tset_size (strdatatype, H5T_VARIABLE);
  //auto status = H5Tset_size(strdatatype, value.size() + 1);
  H5Tset_size(strdatatype, value.size() + 1);

  dataspace space = H5Screate(H5S_SCALAR);
  dataset ds = g.create_dataset(name, strdatatype, space);

  auto err = H5Dwrite(ds, strdatatype, H5S_ALL, H5S_ALL, H5P_DEFAULT, (void*)(value.c_str()));
  if (err < 0) TRIQS_RUNTIME_ERROR << "Error writing the string named" << name << " in the group" << g.name();
 }

void parallel_for_workitem(const group<Dimensions> &g,
                           ParallelForFunctor f) {
#if defined(_OPENMP) && (!defined(TRISYCL_NO_BARRIER) && !defined(_MSC_VER))
  /* To implement barriers With OpenMP, one thread is created for each
     work-item in the group and thus an OpenMP barrier has the same effect
     of an OpenCL barrier executed by the work-items in a workgroup

     The issue is that the parallel_for_workitem() execution is slow even
     when nd_item::barrier() is not used
  */
  range<Dimensions> l_r = g.get_nd_range().get_local_range();
  id<Dimensions> id_l_r { l_r };

  auto tot = l_r.size();

  if constexpr (Dimensions == 1) {
  #pragma omp parallel for collapse(1) schedule(static) num_threads(tot)
    for (size_t i = 0; i < l_r.get(0); ++i) {
      T_Item index{g.get_nd_range()};
      index.set_local(i);
      index.set_global(index.get_local_id() + id_l_r * g.get_id());
      f(index);
    }
  } else if constexpr (Dimensions == 2) {

 void h5_read(group g, std::string const& name, std::string& value) {
  dataset ds = g.open_dataset(name);
  h5::dataspace d_space = H5Dget_space(ds);
  int rank = H5Sget_simple_extent_ndims(d_space);
  if (rank != 0) TRIQS_RUNTIME_ERROR << "Reading a string and got rank !=0";
  size_t size = H5Dget_storage_size(ds);

  datatype strdatatype = H5Tcopy(H5T_C_S1);
  H5Tset_size(strdatatype, size);
  //auto status = H5Tset_size(strdatatype, size);
  // auto status = H5Tset_size (strdatatype, H5T_VARIABLE);

  std::vector<char> buf(size + 1, 0x00);
  auto err = H5Dread(ds, strdatatype, H5S_ALL, H5S_ALL, H5P_DEFAULT, &buf[0]);
  if (err < 0) TRIQS_RUNTIME_ERROR << "Error reading the string named" << name << " in the group" << g.name();

  value = "";
  value.append(&(buf.front()));
 }

object::object(const group& object_) : object_handle_(object_.native_handle())
{
}

 ~node_graph()
 {
     assert(root_group_.child_count() == 0);
 }

	data_callback::data_callback( group& grp )
		: group_ptr_( grp.item_mgt() )
		, owner_(grp)
	{
	}

 /** \brief ctor
  *
  * - initialize root node */
 node_graph(void):
     node_set(node_set_type::bucket_traits(node_buckets, node_set_bucket_count))
 {
     node_set.insert(root_group_);
     root_group_.add_ref();
 }