Add geom::concat

libs/geom/include/psemek/geom/concat.hpp

@@ -0,0 +1,26 @@
+#pragma once
+
+#include <psemek/geom/vector.hpp>
+
+namespace psemek::geom
+{
+
+	template <typename T, std::size_t ... Ns>
+	auto concat(vector<T, Ns> const & ... vs)
+	{
+		vector<T, (Ns + ...)> result;
+
+		std::size_t i = 0;
+
+		auto apply = [&]<std::size_t N>(vector<T, N> const & v)
+		{
+			for (std::size_t j = 0; j < N;)
+				result[i++] = v[j++];
+		};
+
+		(apply(vs), ...);
+
+		return result;
+	}
+
+}