Minor fixes to avoid annoying compilation-time warnings whenever any code includes the Clipper2 headers (#1072)

Author: jfriesne

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

@@ -888,7 +888,7 @@ namespace Clipper2Lib
   // be constrained to seg1. However, it's possible that 'ip' won't be inside
   // seg2, even when 'ip' hasn't been constrained (ie 'ip' is inside seg1).
 
-#if CLIPPER2_HI_PRECISION
+#if defined(CLIPPER2_HI_PRECISION) && CLIPPER2_HI_PRECISION
   // caution: this will compromise performance
   // https://github.com/AngusJohnson/Clipper2/issues/317#issuecomment-1314023253
   // See also CPP/BenchMark/GetIntersectPtBenchmark.cpp

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

@@ -339,7 +339,7 @@ namespace Clipper2Lib {
 		explicit PolyPath64(PolyPath64* parent = nullptr) : PolyPath(parent) {}
 		explicit PolyPath64(PolyPath64* parent, const Path64& path) : PolyPath(parent) { polygon_ = path; }
 
-		~PolyPath64() {
+		~PolyPath64() override {
 			childs_.resize(0);
 		}
 
@@ -406,7 +406,7 @@ namespace Clipper2Lib {
 			polygon_ = path;
 		}
 
-		~PolyPathD() {
+		~PolyPathD() override {
 			childs_.resize(0);
 		}
 

CPP/Clipper2Lib/include/clipper2/clipper.h

@@ -134,7 +134,7 @@ namespace Clipper2Lib {
     JoinType jt, EndType et, double miter_limit = 2.0,
     double arc_tolerance = 0.0)
   {
-    if (!delta) return paths;
+    if (delta==0.0) return paths;
     ClipperOffset clip_offset(miter_limit, arc_tolerance);
     clip_offset.AddPaths(paths, jt, et);
     Paths64 solution;
@@ -148,7 +148,7 @@ namespace Clipper2Lib {
   {
     int error_code = 0;
     CheckPrecisionRange(precision, error_code);
-    if (!delta) return paths;
+    if (delta==0.0) return paths;
     if (error_code) return PathsD();
     const double scale = std::pow(10, precision);
     ClipperOffset clip_offset(miter_limit, arc_tolerance * scale);