Fix MacOS compilation

Author: Sploder12

src/include/sndx/collision/volume.hpp

@@ -7,10 +7,8 @@ namespace sndx {
 	template <class T>
 	concept Vector = requires(const T& vector) {
 		{ T::length() } -> std::convertible_to<size_t>;
-		T::length() > 0;
-
 		{ vector[0] } -> std::convertible_to<float>;
-	};
+	} && T::length() > 0;
 
 	template <class T, size_t n>
 	concept VectorN = Vector<T> && requires() {
@@ -20,17 +18,14 @@ namespace sndx {
 	template <class T>
 	concept Volume = requires(const T& t) {
 		{ T::dimensionality() } -> std::convertible_to<size_t>;
-		T::dimensionality() > 0;
-
 		{ t.getSize() } -> VectorN<T::dimensionality()>;
 		{ t.getCenter() } -> VectorN<T::dimensionality()>;
 		{ t.getArea() } -> std::convertible_to<float>;
 		{ t.contains(t.getCenter()) } -> std::convertible_to<bool>;
 		{ t.distance(t.getCenter()) } -> std::convertible_to<float>;
-	};
+	} && T::dimensionality() > 0;
 
 	template <class T, size_t n>
-	concept VolumeN = Volume<T> && requires() {
-		T::dimensionality() == n;
-	};
+	concept VolumeN = Volume<T> &&
+		(T::dimensionality() == n);
 }

src/include/sndx/container/weighted_vector.hpp

@@ -19,6 +19,10 @@ namespace sndx::container {
 
 			DataT data;
 
+			template<class... Ts>
+			Entry(index_type to, Ts&&... data) :
+				to(to), data(std::forward<Ts>(data)...) {}
+
 			static bool comp(const IndexT& index, const Entry& entry) {
 				return index < entry.to;
 			}
@@ -38,7 +42,7 @@ namespace sndx::container {
 			}
 
 			last += weight;
-			return entries.emplace_back(last, std::forward<Ts...>(data...));
+			return entries.emplace_back(last, std::forward<Ts>(data)...);
 		}
 
 		decltype(auto) push_back(const IndexT& weight, const DataT& data) {