Generic handle contructor, to accept size_t safely without warnings

src/OpenVolumeMesh/Core/OpenVolumeMeshHandle.hh

@@ -46,6 +46,9 @@
 #include <algorithm>
 #include <iosfwd>
 #include <vector>
+#include <limits>
+#include <cassert>
+#include <type_traits>
 
 #include "../System/FunctionalInclude.hh"
 #include "../System/Deprecation.hh"
@@ -55,8 +58,11 @@ namespace OpenVolumeMesh {
 // Define handle types in order to distinguish different entities by their indices
 class OpenVolumeMeshHandle {
 public:
-    // Default constructor
-	explicit OpenVolumeMeshHandle(int _idx) : idx_(_idx) {};
+    template<typename T=int,
+            typename std::enable_if<std::is_integral<T>::value, int>::type = 0>
+    explicit OpenVolumeMeshHandle(T _idx = -1)
+        : idx_(static_cast<int>(_idx))
+    { assert(_idx <= std::numeric_limits<int>::max()); }
 
 	OpenVolumeMeshHandle& operator=(int _idx) {
 		idx_ = _idx;
@@ -97,12 +103,12 @@ private:
 
 // Default entity handles
 
-class VertexHandle   : public OpenVolumeMeshHandle { public: explicit VertexHandle(int _idx = -1)   : OpenVolumeMeshHandle(_idx) {} };
-class EdgeHandle     : public OpenVolumeMeshHandle { public: explicit EdgeHandle(int _idx = -1)     : OpenVolumeMeshHandle(_idx) {} };
-class FaceHandle     : public OpenVolumeMeshHandle { public: explicit FaceHandle(int _idx = -1)     : OpenVolumeMeshHandle(_idx) {} };
-class CellHandle     : public OpenVolumeMeshHandle { public: explicit CellHandle(int _idx = -1)     : OpenVolumeMeshHandle(_idx) {} };
-class HalfEdgeHandle : public OpenVolumeMeshHandle { public: explicit HalfEdgeHandle(int _idx = -1) : OpenVolumeMeshHandle(_idx) {} };
-class HalfFaceHandle : public OpenVolumeMeshHandle { public: explicit HalfFaceHandle(int _idx = -1) : OpenVolumeMeshHandle(_idx) {} };
+class VertexHandle   : public OpenVolumeMeshHandle { public: using OpenVolumeMeshHandle::OpenVolumeMeshHandle; };
+class EdgeHandle     : public OpenVolumeMeshHandle { public: using OpenVolumeMeshHandle::OpenVolumeMeshHandle; };
+class FaceHandle     : public OpenVolumeMeshHandle { public: using OpenVolumeMeshHandle::OpenVolumeMeshHandle; };
+class CellHandle     : public OpenVolumeMeshHandle { public: using OpenVolumeMeshHandle::OpenVolumeMeshHandle; };
+class HalfEdgeHandle : public OpenVolumeMeshHandle { public: using OpenVolumeMeshHandle::OpenVolumeMeshHandle; };
+class HalfFaceHandle : public OpenVolumeMeshHandle { public: using OpenVolumeMeshHandle::OpenVolumeMeshHandle; };
 
 // Helper class that is used to decrease all handles
 // exceeding a certain threshold