Preparing to merge export_usingz branch (AngusJohnson#878)

* Branch from main - to test USINGZ in clipper.export.h

* clipper.header.h - Replaced problematic bit_cast function

* clipper.export.h - tweaked new Reinterpret function

* Tweaked a C++ CI test routine

* clipper.export.h - minor tweak to Reinterpret function

* tweaks to CI config.

* another tweak to C++ CI configuration

Author: AngusJohnson

.github/workflows/actions_cpp.yml

@@ -6,12 +6,12 @@ jobs:
   windows-latest:
     runs-on: 'windows-latest'
     steps:
-    - uses: actions/checkout@v2
-    - uses: actions/setup-node@v2
+    - uses: actions/checkout@v4
+    - uses: actions/setup-node@v4
       with:
         node-version: '16'
     - name: Add MSBuild to PATH
-      uses: microsoft/setup-msbuild@v1.0.2      
+      uses: microsoft/setup-msbuild@v2
     - name: Build
       run: |
         mkdir CPP/build
@@ -25,8 +25,8 @@ jobs:
   ubuntu-latest-gcc-default:
     runs-on: 'ubuntu-latest'
     steps:
-    - uses: actions/checkout@v2
-    - uses: actions/setup-node@v2
+    - uses: actions/checkout@v4
+    - uses: actions/setup-node@v4
       with:
         node-version: '16'
     - name: Build
@@ -42,8 +42,8 @@ jobs:
   ubuntu-latest-gcc-11:
     runs-on: 'ubuntu-latest'
     steps:
-    - uses: actions/checkout@v2
-    - uses: actions/setup-node@v2
+    - uses: actions/checkout@v4
+    - uses: actions/setup-node@v4
       with:
         node-version: '16'
     - name: Install gcc 11
@@ -64,8 +64,8 @@ jobs:
   ubuntu-latest-clang-default:
     runs-on: 'ubuntu-latest'
     steps:
-    - uses: actions/checkout@v2
-    - uses: actions/setup-node@v2
+    - uses: actions/checkout@v4
+    - uses: actions/setup-node@v4
       with:
         node-version: '16'
     - name: Build
@@ -83,8 +83,8 @@ jobs:
   ubuntu-latest-clang-13:
     runs-on: 'ubuntu-latest'
     steps:
-    - uses: actions/checkout@v2
-    - uses: actions/setup-node@v2
+    - uses: actions/checkout@v4
+    - uses: actions/setup-node@v4
       with:
         node-version: '16'
     - name: Install clang 13
@@ -107,8 +107,8 @@ jobs:
   macos-latest:
     runs-on: 'macos-latest'
     steps:
-    - uses: actions/checkout@v2
-    - uses: actions/setup-node@v2
+    - uses: actions/checkout@v4
+    - uses: actions/setup-node@v4
       with:
         node-version: '16'
     - name: Build

.github/workflows/actions_csharp.yml

@@ -9,7 +9,7 @@ jobs:
       run:
         working-directory: ./CSharp
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
     - name: Copy Clipper2Lib to USINGZ directory
       run: cp Clipper2Lib/*.cs USINGZ/
     - name: Setup .NET Core

CPP/Clipper2Lib/include/clipper2/clipper.core.h

@@ -107,17 +107,21 @@ namespace Clipper2Lib
   //https://en.wikipedia.org/wiki/Nonzero-rule
   enum class FillRule { EvenOdd, NonZero, Positive, Negative };
 
+#ifdef USINGZ
+  using z_type = int64_t;
+#endif
+
   // Point ------------------------------------------------------------------------
 
   template <typename T>
   struct Point {
     T x;
     T y;
 #ifdef USINGZ
-    int64_t z;
+     z_type z;
 
     template <typename T2>
-    inline void Init(const T2 x_ = 0, const T2 y_ = 0, const int64_t z_ = 0)
+    inline void Init(const T2 x_ = 0, const T2 y_ = 0, const z_type z_ = 0)
     {
       if constexpr (std::is_integral_v<T> &&
         is_round_invocable<T2>::value && !std::is_integral_v<T2>)
@@ -137,7 +141,7 @@ namespace Clipper2Lib
     explicit Point() : x(0), y(0), z(0) {};
 
     template <typename T2>
-    Point(const T2 x_, const T2 y_, const int64_t z_ = 0)
+    Point(const T2 x_, const T2 y_, const z_type z_ = 0)
     {
       Init(x_, y_);
       z = z_;
@@ -150,7 +154,7 @@ namespace Clipper2Lib
     }
 
     template <typename T2>
-    explicit Point(const Point<T2>& p, int64_t z_)
+    explicit Point(const Point<T2>& p, z_type z_)
     {
       Init(p.x, p.y, z_);
     }
@@ -160,7 +164,7 @@ namespace Clipper2Lib
       return Point(x * scale, y * scale, z);
     }
 
-    void SetZ(const int64_t z_value) { z = z_value; }
+    void SetZ(const z_type z_value) { z = z_value; }
 
     friend std::ostream& operator<<(std::ostream& os, const Point& point)
     {