initial updated spatial-index implementation

This commit is contained in:
artemp 2017-08-16 10:35:04 +01:00
parent e00152b262
commit 2426a44671
6 changed files with 163 additions and 85 deletions

View file

@ -132,87 +132,91 @@ inline T sqr(T x)
return x * x; return x * x;
} }
inline double distance2(double x0,double y0,double x1,double y1) inline double distance2(double x0, double y0, double x1, double y1)
{ {
double dx = x1 - x0; double dx = x1 - x0;
double dy = y1 - y0; double dy = y1 - y0;
return sqr(dx) + sqr(dy); return sqr(dx) + sqr(dy);
} }
inline double distance(double x0,double y0, double x1,double y1) inline double distance(double x0, double y0, double x1, double y1)
{ {
return std::sqrt(distance2(x0,y0,x1,y1)); return std::sqrt(distance2(x0, y0, x1, y1));
} }
inline double point_to_segment_distance(double x, double y, inline double point_to_segment_distance(double x, double y,
double ax, double ay, double ax, double ay,
double bx, double by) double bx, double by)
{ {
double len2 = distance2(ax,ay,bx,by); double len2 = distance2(ax, ay, bx, by);
if (len2 < 1e-14) if (len2 < 1e-14)
{ {
return distance(x,y,ax,ay); return distance(x, y, ax, ay);
} }
double r = ((x - ax)*(bx - ax) + (y - ay)*(by -ay))/len2; double r = ((x - ax) * (bx - ax) + (y - ay) * (by - ay)) / len2;
if ( r < 0 ) if (r < 0)
{ {
return distance(x,y,ax,ay); return distance(x, y, ax, ay);
} }
else if (r > 1) else if (r > 1)
{ {
return distance(x,y,bx,by); return distance(x, y, bx, by);
} }
double s = ((ay - y)*(bx - ax) - (ax - x)*(by - ay))/len2; double s = ((ay - y) * (bx - ax) - (ax - x) * (by - ay)) / len2;
return std::fabs(s) * std::sqrt(len2); return std::fabs(s) * std::sqrt(len2);
} }
template <typename Iter> template <typename Iter>
inline bool point_on_path(double x,double y,Iter start,Iter end, double tol) inline bool point_on_path(double x, double y, Iter start, Iter end, double tol)
{ {
double x0=std::get<0>(*start); double x0 = std::get<0>(*start);
double y0=std::get<1>(*start); double y0 = std::get<1>(*start);
double x1 = 0; double x1 = 0;
double y1 = 0; double y1 = 0;
while (++start != end) while (++start != end)
{ {
if ( std::get<2>(*start) == SEG_MOVETO) if (std::get<2>(*start) == SEG_MOVETO)
{ {
x0 = std::get<0>(*start); x0 = std::get<0>(*start);
y0 = std::get<1>(*start); y0 = std::get<1>(*start);
continue; continue;
} }
x1=std::get<0>(*start); x1 = std::get<0>(*start);
y1=std::get<1>(*start); y1 = std::get<1>(*start);
double distance = point_to_segment_distance(x,y,x0,y0,x1,y1); double distance = point_to_segment_distance(x, y, x0, y0, x1, y1);
if (distance < tol) if (distance < tol)
return true; return true;
x0=x1; x0 = x1;
y0=y1; y0 = y1;
} }
return false; return false;
} }
// filters // filters
struct filter_in_box template <typename T>
struct bounding_box_filter
{ {
box2d<double> box_; using value_type = T;
explicit filter_in_box(box2d<double> const& box) box2d<value_type> box_;
explicit bounding_box_filter(box2d<value_type> const& box)
: box_(box) {} : box_(box) {}
bool pass(box2d<double> const& extent) const bool pass(box2d<value_type> const& extent) const
{ {
return extent.intersects(box_); return extent.intersects(box_);
} }
}; };
using filter_in_box = bounding_box_filter<double>;
struct filter_at_point struct filter_at_point
{ {
box2d<double> box_; box2d<double> box_;
explicit filter_at_point(coord2d const& pt, double tol=0) explicit filter_at_point(coord2d const& pt, double tol = 0)
: box_(pt,pt) : box_(pt, pt)
{ {
box_.pad(tol); box_.pad(tol);
} }

View file

@ -175,7 +175,21 @@ geojson_datasource::geojson_datasource(parameters const& params)
} }
else else
{ {
initialise_index(start, end); //initialise_index(start, end);
std::string index_filename = filename_ + ".bbox.rtree";
std::cerr << "loading " << index_filename << " .." << std::endl;
index_file_ = boost::interprocess::managed_mapped_file(boost::interprocess::open_only, index_filename.c_str());
tree_ = std::unique_ptr<spatial_index_type, std::function<void(spatial_index_type*)>>
(index_file_.find<spatial_index_type>("rtree-index").first,
[](spatial_index_type* si) {std::cerr << "calling deleter:" << si << std::endl;});
std::cerr << "TREE:" << tree_.get() << std::endl;
auto bounds = tree_->bounds();
double min_x = bounds.min_corner().get<0>();
double min_y = bounds.min_corner().get<1>();
double max_x = bounds.max_corner().get<0>();
double max_y = bounds.max_corner().get<1>();
std::cerr << "Bounding box: " << min_x << "," << min_y << "," << max_x << "," << max_y << std::endl;
extent_ = { min_x, min_y, max_x, max_y };
} }
} }
} }
@ -206,27 +220,30 @@ void geojson_datasource::initialise_descriptor(mapnik::feature_ptr const& featur
void geojson_datasource::initialise_disk_index(std::string const& filename) void geojson_datasource::initialise_disk_index(std::string const& filename)
{ {
// read extent // read extent
using value_type = std::pair<std::uint64_t, std::uint64_t>; using value_type = record;//std::pair<std::uint64_t, std::uint64_t>;
std::ifstream index(filename_ + ".index", std::ios::binary); std::ifstream index(filename_ + ".index", std::ios::binary);
if (!index) throw mapnik::datasource_exception("GeoJSON Plugin: could not open: '" + filename_ + ".index'"); if (!index) throw mapnik::datasource_exception("GeoJSON Plugin: could not open: '" + filename_ + ".index'");
extent_ = mapnik::util::spatial_index<value_type, auto ext_f = mapnik::util::spatial_index<value_type,
mapnik::filter_in_box, mapnik::filter_in_box,
std::ifstream>::bounding_box(index); std::ifstream,
mapnik::filter_in_box filter(extent_); mapnik::box2d<float>>::bounding_box(index);
extent_ = { ext_f.minx(), ext_f.miny(),ext_f.maxx(), ext_f.maxy() };
std::cerr << "EXTENT:" << extent_ << std::endl;
mapnik::bounding_box_filter<float> filter(ext_f);
std::vector<value_type> positions; std::vector<value_type> positions;
mapnik::util::spatial_index<value_type, mapnik::util::spatial_index<value_type,
mapnik::filter_in_box, mapnik::bounding_box_filter<float>,
std::ifstream>::query_first_n(filter, index, positions, num_features_to_query_); std::ifstream, mapnik::box2d<float>>::query_first_n(filter, index, positions, num_features_to_query_);
mapnik::util::file file(filename_); mapnik::util::file file(filename_);
if (!file) throw mapnik::datasource_exception("GeoJSON Plugin: could not open: '" + filename_ + "'"); if (!file) throw mapnik::datasource_exception("GeoJSON Plugin: could not open: '" + filename_ + "'");
mapnik::context_ptr ctx = std::make_shared<mapnik::context_type>(); mapnik::context_ptr ctx = std::make_shared<mapnik::context_type>();
for (auto const& pos : positions) for (auto const& pos : positions)
{ {
std::fseek(file.get(), pos.first, SEEK_SET); std::fseek(file.get(), pos.off, SEEK_SET);
std::vector<char> record; std::vector<char> record;
record.resize(pos.second); record.resize(pos.size);
auto count = std::fread(record.data(), pos.second, 1, file.get()); auto count = std::fread(record.data(), pos.size, 1, file.get());
auto const* start = record.data(); auto const* start = record.data();
auto const* end = (count == 1) ? start + record.size() : start; auto const* end = (count == 1) ? start + record.size() : start;
mapnik::feature_ptr feature(mapnik::feature_factory::create(ctx, -1)); mapnik::feature_ptr feature(mapnik::feature_factory::create(ctx, -1));
@ -348,7 +365,7 @@ void geojson_datasource::initialise_index(Iterator start, Iterator end)
} }
} }
// packing algorithm // packing algorithm
tree_ = std::make_unique<spatial_index_type>(values); //tree_ = std::make_unique<spatial_index_type>(values);
} }
desc_.order_by_name(); desc_.order_by_name();
} }
@ -393,7 +410,6 @@ void geojson_datasource::parse_geojson(Iterator start, Iterator end)
features_.push_back(std::move(feature)); features_.push_back(std::move(feature));
} }
using values_container = std::vector< std::pair<box_type, std::pair<std::uint64_t, std::uint64_t>>>; using values_container = std::vector< std::pair<box_type, std::pair<std::uint64_t, std::uint64_t>>>;
values_container values; values_container values;
values.reserve(features_.size()); values.reserve(features_.size());
@ -421,8 +437,7 @@ void geojson_datasource::parse_geojson(Iterator start, Iterator end)
++geometry_index; ++geometry_index;
} }
// packing algorithm // packing algorithm
tree_ = std::make_unique<spatial_index_type>(values); //tree_ = std::make_unique<spatial_index_type>(values);
} }
geojson_datasource::~geojson_datasource() {} geojson_datasource::~geojson_datasource() {}
@ -453,14 +468,15 @@ boost::optional<mapnik::datasource_geometry_t> geojson_datasource::get_geometry_
int multi_type = 0; int multi_type = 0;
if (has_disk_index_) if (has_disk_index_)
{ {
using value_type = std::pair<std::uint64_t, std::uint64_t>; using value_type = record;//std::pair<std::uint64_t, std::uint64_t>;
std::ifstream index(filename_ + ".index", std::ios::binary); std::ifstream index(filename_ + ".index", std::ios::binary);
if (!index) throw mapnik::datasource_exception("GeoJSON Plugin: could not open: '" + filename_ + ".index'"); if (!index) throw mapnik::datasource_exception("GeoJSON Plugin: could not open: '" + filename_ + ".index'");
mapnik::filter_in_box filter(extent_); mapnik::bounding_box_filter<float> filter(mapnik::box2d<float>(extent_.minx(),extent_.miny(), extent_.maxx(),extent_.maxy()));
std::vector<value_type> positions; std::vector<value_type> positions;
mapnik::util::spatial_index<value_type, mapnik::util::spatial_index<value_type,
mapnik::filter_in_box, mapnik::bounding_box_filter<float>,
std::ifstream>::query_first_n(filter, index, positions, num_features_to_query_); std::ifstream,
mapnik::box2d<float>>::query_first_n(filter, index, positions, num_features_to_query_);
mapnik::util::file file(filename_); mapnik::util::file file(filename_);
@ -468,10 +484,10 @@ boost::optional<mapnik::datasource_geometry_t> geojson_datasource::get_geometry_
mapnik::context_ptr ctx = std::make_shared<mapnik::context_type>(); mapnik::context_ptr ctx = std::make_shared<mapnik::context_type>();
for (auto const& pos : positions) for (auto const& pos : positions)
{ {
std::fseek(file.get(), pos.first, SEEK_SET); std::fseek(file.get(), pos.off, SEEK_SET);
std::vector<char> record; std::vector<char> record;
record.resize(pos.second); record.resize(pos.size);
auto count = std::fread(record.data(), pos.second, 1, file.get()); auto count = std::fread(record.data(), pos.size, 1, file.get());
auto const* start = record.data(); auto const* start = record.data();
auto const* end = (count == 1) ? start + record.size() : start; auto const* end = (count == 1) ? start + record.size() : start;
mapnik::feature_ptr feature(mapnik::feature_factory::create(ctx, -1)); // temp feature mapnik::feature_ptr feature(mapnik::feature_factory::create(ctx, -1)); // temp feature
@ -586,12 +602,15 @@ mapnik::featureset_ptr geojson_datasource::features(mapnik::query const& q) cons
} }
else else
{ {
std::cerr << "Num features:" << index_array.size() << std::endl;
return std::make_shared<geojson_memory_index_featureset>(filename_, std::move(index_array)); return std::make_shared<geojson_memory_index_featureset>(filename_, std::move(index_array));
} }
} }
else if (has_disk_index_) else if (has_disk_index_)
{ {
mapnik::filter_in_box filter(q.get_bbox()); //mapnik::filter_in_box filter(q.get_bbox());
auto const& bbox = q.get_bbox();
mapnik::bounding_box_filter<float> const filter(mapnik::box2d<float>(bbox.minx(), bbox.miny(), bbox.maxx(), bbox.maxy()));
return std::make_shared<geojson_index_featureset>(filename_, filter); return std::make_shared<geojson_index_featureset>(filename_, filter);
} }

View file

@ -38,6 +38,7 @@
#include <boost/optional.hpp> #include <boost/optional.hpp>
#include <boost/version.hpp> #include <boost/version.hpp>
#include <boost/geometry/index/rtree.hpp> #include <boost/geometry/index/rtree.hpp>
#include <boost/interprocess/managed_mapped_file.hpp>
#pragma GCC diagnostic pop #pragma GCC diagnostic pop
// stl // stl
@ -46,7 +47,7 @@
#include <string> #include <string>
#include <map> #include <map>
#include <deque> #include <deque>
#include <functional>
template <std::size_t Max, std::size_t Min> template <std::size_t Max, std::size_t Min>
struct geojson_linear : boost::geometry::index::linear<Max,Min> {}; struct geojson_linear : boost::geometry::index::linear<Max,Min> {};
@ -74,10 +75,13 @@ struct options_type<geojson_linear<Max,Min> >
class geojson_datasource : public mapnik::datasource class geojson_datasource : public mapnik::datasource
{ {
public: public:
using box_type = mapnik::box2d<double>; using box_type = mapnik::box2d<float>;
using item_type = std::pair<box_type, std::pair<std::uint64_t, std::uint64_t> >; using item_type = std::pair<box_type, std::pair<std::uint64_t, std::uint64_t> >;
using spatial_index_type = boost::geometry::index::rtree<item_type,geojson_linear<16,4> >; using indexable_type = boost::geometry::index::indexable<item_type>;
using equal_to_type = boost::geometry::index::equal_to<item_type>;
using allocator_type = boost::interprocess::allocator<item_type, boost::interprocess::managed_mapped_file::segment_manager>;
using spatial_index_type = boost::geometry::index::rtree<item_type, boost::geometry::index::linear<16>, indexable_type, equal_to_type, allocator_type>;
//using spatial_index_type = boost::geometry::index::rtree<item_type,geojson_linear<16,4> >;
// constructor // constructor
geojson_datasource(mapnik::parameters const& params); geojson_datasource(mapnik::parameters const& params);
virtual ~geojson_datasource (); virtual ~geojson_datasource ();
@ -101,11 +105,18 @@ private:
bool from_inline_string_; bool from_inline_string_;
mapnik::box2d<double> extent_; mapnik::box2d<double> extent_;
std::vector<mapnik::feature_ptr> features_; std::vector<mapnik::feature_ptr> features_;
std::unique_ptr<spatial_index_type> tree_; std::unique_ptr<spatial_index_type, std::function<void(spatial_index_type*)>> tree_;
boost::interprocess::managed_mapped_file index_file_;
bool cache_features_ = true; bool cache_features_ = true;
bool has_disk_index_ = false; bool has_disk_index_ = false;
const std::size_t num_features_to_query_; const std::size_t num_features_to_query_;
}; };
struct record
{
std::uint64_t off;
std::uint64_t size;
float box[4];
};
#endif // GEOJSON_DATASOURCE_HPP #endif // GEOJSON_DATASOURCE_HPP

View file

@ -34,8 +34,9 @@
#include <string> #include <string>
#include <vector> #include <vector>
#include <fstream> #include <fstream>
#include <algorithm>
geojson_index_featureset::geojson_index_featureset(std::string const& filename, mapnik::filter_in_box const& filter) geojson_index_featureset::geojson_index_featureset(std::string const& filename, mapnik::bounding_box_filter<float> const& filter)
: :
#if defined(MAPNIK_MEMORY_MAPPED_FILE) #if defined(MAPNIK_MEMORY_MAPPED_FILE)
// //
@ -44,7 +45,8 @@ geojson_index_featureset::geojson_index_featureset(std::string const& filename,
#else #else
file_(std::fopen(filename.c_str(),"rb"), std::fclose), file_(std::fopen(filename.c_str(),"rb"), std::fclose),
#endif #endif
ctx_(std::make_shared<mapnik::context_type>()) ctx_(std::make_shared<mapnik::context_type>()),
query_box_(filter.box_)
{ {
#if defined (MAPNIK_MEMORY_MAPPED_FILE) #if defined (MAPNIK_MEMORY_MAPPED_FILE)
@ -65,11 +67,20 @@ geojson_index_featureset::geojson_index_featureset(std::string const& filename,
std::ifstream index(indexname.c_str(), std::ios::binary); std::ifstream index(indexname.c_str(), std::ios::binary);
if (!index) throw mapnik::datasource_exception("GeoJSON Plugin: can't open index file " + indexname); if (!index) throw mapnik::datasource_exception("GeoJSON Plugin: can't open index file " + indexname);
mapnik::util::spatial_index<value_type, mapnik::util::spatial_index<value_type,
mapnik::filter_in_box, mapnik::bounding_box_filter<float>,
std::ifstream>::query(filter, index, positions_); std::ifstream,
mapnik::box2d<float>>::query(filter, index, positions_);
std::cerr << "#1 Num features:" << positions_.size() << std::endl;
positions_.erase(std::remove_if(positions_.begin(),
positions_.end(),
[&](value_type const& pos)
{ return !mapnik::box2d<float>{pos.box[0], pos.box[1], pos.box[2], pos.box[3]}.intersects(query_box_);}),
positions_.end());
std::cerr << "#2 Num features:" << positions_.size() << std::endl;
std::sort(positions_.begin(), positions_.end(), std::sort(positions_.begin(), positions_.end(),
[](value_type const& lhs, value_type const& rhs) { return lhs.first < rhs.first;}); [](value_type const& lhs, value_type const& rhs) { return lhs.off < rhs.off;});
itr_ = positions_.begin(); itr_ = positions_.begin();
} }
@ -81,13 +92,13 @@ mapnik::feature_ptr geojson_index_featureset::next()
{ {
auto pos = *itr_++; auto pos = *itr_++;
#if defined(MAPNIK_MEMORY_MAPPED_FILE) #if defined(MAPNIK_MEMORY_MAPPED_FILE)
char const* start = (char const*)mapped_region_->get_address() + pos.first; char const* start = (char const*)mapped_region_->get_address() + pos.off;
char const* end = start + pos.second; char const* end = start + pos.size;
#else #else
std::fseek(file_.get(), pos.first, SEEK_SET); std::fseek(file_.get(), pos.off, SEEK_SET);
std::vector<char> record; std::vector<char> record;
record.resize(pos.second); record.resize(pos.second);
auto count = std::fread(record.data(), pos.second, 1, file_.get()); auto count = std::fread(record.data(), pos.size, 1, file_.get());
auto const* start = record.data(); auto const* start = record.data();
auto const* end = (count == 1) ? start + record.size() : start; auto const* end = (count == 1) ? start + record.size() : start;
#endif #endif
@ -96,8 +107,7 @@ mapnik::feature_ptr geojson_index_featureset::next()
using mapnik::json::grammar::iterator_type; using mapnik::json::grammar::iterator_type;
mapnik::json::parse_feature(start, end, *feature, tr); // throw on failure mapnik::json::parse_feature(start, end, *feature, tr); // throw on failure
// skip empty geometries // skip empty geometries
if (mapnik::geometry::is_empty(feature->get_geometry())) if (mapnik::geometry::is_empty(feature->get_geometry())) continue;
continue;
return feature; return feature;
} }
return mapnik::feature_ptr(); return mapnik::feature_ptr();

View file

@ -41,9 +41,9 @@
class geojson_index_featureset : public mapnik::Featureset class geojson_index_featureset : public mapnik::Featureset
{ {
using value_type = std::pair<std::uint64_t, std::uint64_t>; using value_type = record;
public: public:
geojson_index_featureset(std::string const& filename, mapnik::filter_in_box const& filter); geojson_index_featureset(std::string const& filename, mapnik::bounding_box_filter<float> const& filter);
virtual ~geojson_index_featureset(); virtual ~geojson_index_featureset();
mapnik::feature_ptr next(); mapnik::feature_ptr next();
@ -57,6 +57,7 @@ private:
#endif #endif
mapnik::value_integer feature_id_ = 1; mapnik::value_integer feature_id_ = 1;
mapnik::context_ptr ctx_; mapnik::context_ptr ctx_;
mapnik::box2d<float> query_box_;
std::vector<value_type> positions_; std::vector<value_type> positions_;
std::vector<value_type>::iterator itr_; std::vector<value_type>::iterator itr_;
}; };

View file

@ -68,6 +68,7 @@ int main (int argc, char** argv)
char separator = 0; char separator = 0;
char quote = 0; char quote = 0;
std::string manual_headers; std::string manual_headers;
po::variables_map vm;
try try
{ {
po::options_description desc("Mapnik CSV/GeoJSON index utility"); po::options_description desc("Mapnik CSV/GeoJSON index utility");
@ -82,11 +83,11 @@ int main (int argc, char** argv)
("manual-headers,H", po::value<std::string>(), "CSV manual headers string") ("manual-headers,H", po::value<std::string>(), "CSV manual headers string")
("files",po::value<std::vector<std::string> >(),"Files to index: file1 file2 ...fileN") ("files",po::value<std::vector<std::string> >(),"Files to index: file1 file2 ...fileN")
("validate-features", "Validate GeoJSON features") ("validate-features", "Validate GeoJSON features")
("bbox,b", "output bounding boxes")
; ;
po::positional_options_description p; po::positional_options_description p;
p.add("files",-1); p.add("files",-1);
po::variables_map vm;
po::store(po::command_line_parser(argc, argv) po::store(po::command_line_parser(argc, argv)
.options(desc) .options(desc)
.style(po::command_line_style::unix_style | po::command_line_style::allow_long_disguise) .style(po::command_line_style::unix_style | po::command_line_style::allow_long_disguise)
@ -208,29 +209,61 @@ int main (int argc, char** argv)
{ {
std::clog << extent << std::endl; std::clog << extent << std::endl;
mapnik::box2d<double> extent_d(extent.minx(), extent.miny(), extent.maxx(), extent.maxy()); mapnik::box2d<double> extent_d(extent.minx(), extent.miny(), extent.maxx(), extent.maxy());
mapnik::quad_tree<std::pair<std::uint64_t, std::uint64_t>> tree(extent_d, depth, ratio); if (vm.count("bbox"))
for (auto const& item : boxes)
{ {
auto ext_f = std::get<0>(item); std::fstream file((filename + ".bbox").c_str(),
tree.insert(std::get<1>(item), mapnik::box2d<double>(ext_f.minx(), ext_f.miny(), ext_f.maxx(), ext_f.maxy())); std::ios::in | std::ios::out | std::ios::trunc | std::ios::binary);
} if (!file)
{
std::fstream file((filename + ".index").c_str(), std::clog << "cannot open index file for writing file \""
std::ios::in | std::ios::out | std::ios::trunc | std::ios::binary); << (filename + ".bbox") << "\"" << std::endl;
if (!file) }
{ else
std::clog << "cannot open index file for writing file \"" {
<< (filename + ".index") << "\"" << std::endl; for (auto const& item : boxes)
{
auto ext_f = std::get<0>(item);
auto pos = std::get<1>(item);
file.write(reinterpret_cast<char const*>(&pos.first), sizeof(std::uint64_t));
file.write(reinterpret_cast<char const*>(&pos.second), sizeof(std::uint64_t));
file.write(reinterpret_cast<char const*>(&ext_f), sizeof(ext_f));
}
}
} }
else else
{ {
tree.trim(); struct record {
std::clog << "number nodes=" << tree.count() << std::endl; std::uint64_t off;
std::clog << "number element=" << tree.count_items() << std::endl; std::uint64_t size;
file.exceptions(std::ios::failbit | std::ios::badbit); float box[4];
tree.write(file); } rec;
file.flush();
file.close(); mapnik::quad_tree<record, mapnik::box2d<float>> tree(extent, depth, ratio);
for (auto const& item : boxes)
{
auto ext_f = std::get<0>(item);
rec = { std::get<1>(item).first, std::get<1>(item).second, { ext_f.minx(), ext_f.miny(), ext_f.maxx(), ext_f.maxy() }};
//tree.insert(rec, mapnik::box2d<double>(ext_f.minx(), ext_f.miny(), ext_f.maxx(), ext_f.maxy()));
tree.insert(rec, ext_f);
}
std::fstream file((filename + ".index").c_str(),
std::ios::in | std::ios::out | std::ios::trunc | std::ios::binary);
if (!file)
{
std::clog << "cannot open index file for writing file \""
<< (filename + ".index") << "\"" << std::endl;
}
else
{
tree.trim();
std::clog << "number nodes=" << tree.count() << std::endl;
std::clog << "number element=" << tree.count_items() << std::endl;
file.exceptions(std::ios::failbit | std::ios::badbit);
tree.write(file);
file.flush();
file.close();
}
} }
} }
else else