add universal overloads for begin and end

alib2std/src/extensions/iterator.hpp

@@ -977,6 +977,54 @@ inline constexpr void retract ( Iterator & i, Distance n ) {
 	retractInternal ( i, d, std::__iterator_category ( i ) );
 }
+/**
+ * Generalization of begin for universaly referenced containers.
+ *
+ * \param cont the container to call begin on
+ *
+ * \result the begin move iterator
+ */
+template < class Container >
+auto begin ( Container && cont ) -> decltype ( std::forward ( cont ).begin ( ) ) {
+	return std::forward ( cont ).begin ( );
+}
+
+/**
+ * Generalization of end for universaly referenced containers.
+ *
+ * \param cont the container to call end on
+ *
+ * \result the end move iterator
+ */
+template < class Container >
+auto end ( Container && cont ) -> decltype ( std::forward ( cont ).end ( ) ) {
+	return std::forward ( cont ).end ( );
+}
+
+/**
+ * Specialization of begin for static array.
+ *
+ * \param arr the static array
+ *
+ * \result the begining of the array
+ */
+template < class T, size_t N >
+constexpr T * begin ( T ( & arr ) [ N ] ) noexcept {
+	return arr;
+}
+
+/**
+ * Specialization of end for static array.
+ *
+ * \param arr the static array
+ *
+ * \result the one after the last element in the array
+ */
+template < class T, size_t N >
+constexpr T * end ( T ( & arr ) [ N ] ) noexcept {
+	return arr + N;
+}
+
 } /* namespace ext */
 #endif /* __ITERATOR_HPP_ */