From 8376a0ab26042fa356bfc066cbf3a975d34144f1 Mon Sep 17 00:00:00 2001
From: nonwill <nonwill@hotmail.com>
Date: Mon, 27 Jan 2025 08:32:29 +0800
Subject: [PATCH] Add compatible function from Clipper1Lib: operator<<

Path<T>& operator<<(Path<T>& poly, const Point<T2>& p)
Paths<T>& operator<<(Paths<T>& polys, const Path<T>& p)
---
 CPP/Clipper2Lib/include/clipper2/clipper.core.h | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/CPP/Clipper2Lib/include/clipper2/clipper.core.h b/CPP/Clipper2Lib/include/clipper2/clipper.core.h
index ab71aeb0..da44e588 100644
--- a/CPP/Clipper2Lib/include/clipper2/clipper.core.h
+++ b/CPP/Clipper2Lib/include/clipper2/clipper.core.h
@@ -248,6 +248,20 @@ namespace Clipper2Lib
   template <typename T>
   using Paths = std::vector<Path<T>>;
 
+  template <typename T, typename T2=T>
+  Path<T>& operator<<(Path<T>& poly, const Point<T2>& p)
+  {
+    poly.emplace_back(p);
+    return poly;
+  }
+
+  template <typename T>
+  Paths<T>& operator<<(Paths<T>& polys, const Path<T>& p)
+  {
+    polys.emplace_back(p);
+    return polys;
+  }
+
   using Path64 = Path<int64_t>;
   using PathD = Path<double>;
   using Paths64 = std::vector< Path64>;