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authorwanglu <wang_lu@dl.cn.nexty-ele.com>2019-03-25 09:42:49 +0800
committerwanglu <wang_lu@dl.cn.nexty-ele.com>2019-03-25 09:52:02 +0800
commit4a8b7a6301e4b093c99329d0a16fbee6c535f312 (patch)
treefe9f589e1723e8f173b50dfa617374042f4cf7a7 /include/mapbox/geometry/for_each_point.hpp
parentfb539bbd9f7b36d26cd56fe09b804e18b3b3d984 (diff)
Change-Id: I0866a7d9ffa347c0935b4d00259ad1a74cd00d6e Signed-off-by: wanglu <wang_lu@dl.cn.nexty-ele.com>
Diffstat (limited to 'include/mapbox/geometry/for_each_point.hpp')
-rw-r--r--include/mapbox/geometry/for_each_point.hpp45
1 files changed, 45 insertions, 0 deletions
diff --git a/include/mapbox/geometry/for_each_point.hpp b/include/mapbox/geometry/for_each_point.hpp
new file mode 100644
index 0000000..44d6e77
--- /dev/null
+++ b/include/mapbox/geometry/for_each_point.hpp
@@ -0,0 +1,45 @@
+#pragma once
+
+#include <mapbox/geometry/geometry.hpp>
+
+namespace mapbox {
+namespace geometry {
+
+template <typename Point, typename F>
+auto for_each_point(Point&& point, F&& f)
+ -> decltype(point.x, point.y, void())
+{
+ f(std::forward<Point>(point));
+}
+
+template <typename Container, typename F>
+auto for_each_point(Container&& container, F&& f)
+ -> decltype(container.begin(), container.end(), void());
+
+template <typename...Types, typename F>
+void for_each_point(mapbox::util::variant<Types...> const& geom, F&& f)
+{
+ mapbox::util::variant<Types...>::visit(geom, [&] (auto const& g) {
+ for_each_point(g, f);
+ });
+}
+
+template <typename...Types, typename F>
+void for_each_point(mapbox::util::variant<Types...> & geom, F&& f)
+{
+ mapbox::util::variant<Types...>::visit(geom, [&] (auto & g) {
+ for_each_point(g, f);
+ });
+}
+
+template <typename Container, typename F>
+auto for_each_point(Container&& container, F&& f)
+ -> decltype(container.begin(), container.end(), void())
+{
+ for (auto& e: container) {
+ for_each_point(e, f);
+ }
+}
+
+} // namespace geometry
+} // namespace mapbox