+//===----------------------------------------------------------------------===//
+// Extra additions for arrays
+//===----------------------------------------------------------------------===//
+
+/// Find where an array ends (for ending iterators)
+/// This returns a pointer to the byte immediately
+/// after the end of an array.
+template<class T, std::size_t N>
+inline T *array_endof(T (&x)[N]) {
+ return x+N;
+}
+
+/// Find the length of an array.
+template<class T, std::size_t N>
+inline size_t array_lengthof(T (&)[N]) {
+ return N;
+}
+
+/// array_pod_sort_comparator - This is helper function for array_pod_sort,
+/// which just uses operator< on T.
+template<typename T>
+inline int array_pod_sort_comparator(const void *P1, const void *P2) {
+ if (*reinterpret_cast<const T*>(P1) < *reinterpret_cast<const T*>(P2))
+ return -1;
+ if (*reinterpret_cast<const T*>(P2) < *reinterpret_cast<const T*>(P1))
+ return 1;
+ return 0;
+}
+
+/// get_array_pad_sort_comparator - This is an internal helper function used to
+/// get type deduction of T right.
+template<typename T>
+inline int (*get_array_pad_sort_comparator(const T &))
+ (const void*, const void*) {
+ return array_pod_sort_comparator<T>;
+}
+
+
+/// array_pod_sort - This sorts an array with the specified start and end
+/// extent. This is just like std::sort, except that it calls qsort instead of
+/// using an inlined template. qsort is slightly slower than std::sort, but
+/// most sorts are not performance critical in LLVM and std::sort has to be
+/// template instantiated for each type, leading to significant measured code
+/// bloat. This function should generally be used instead of std::sort where
+/// possible.
+///
+/// This function assumes that you have simple POD-like types that can be
+/// compared with operator< and can be moved with memcpy. If this isn't true,
+/// you should use std::sort.
+///
+/// NOTE: If qsort_r were portable, we could allow a custom comparator and
+/// default to std::less.
+template<class IteratorTy>
+inline void array_pod_sort(IteratorTy Start, IteratorTy End) {
+ // Don't dereference start iterator of empty sequence.
+ if (Start == End) return;
+ qsort(&*Start, End-Start, sizeof(*Start),
+ get_array_pad_sort_comparator(*Start));
+}
+
+template<class IteratorTy>
+inline void array_pod_sort(IteratorTy Start, IteratorTy End,
+ int (*Compare)(const void*, const void*)) {
+ // Don't dereference start iterator of empty sequence.
+ if (Start == End) return;
+ qsort(&*Start, End-Start, sizeof(*Start), Compare);
+}
+
+//===----------------------------------------------------------------------===//
+// Extra additions to <algorithm>
+//===----------------------------------------------------------------------===//
+
+/// For a container of pointers, deletes the pointers and then clears the
+/// container.
+template<typename Container>
+void DeleteContainerPointers(Container &C) {
+ for (typename Container::iterator I = C.begin(), E = C.end(); I != E; ++I)
+ delete *I;
+ C.clear();
+}
+
+/// In a container of pairs (usually a map) whose second element is a pointer,
+/// deletes the second elements and then clears the container.
+template<typename Container>
+void DeleteContainerSeconds(Container &C) {
+ for (typename Container::iterator I = C.begin(), E = C.end(); I != E; ++I)
+ delete I->second;
+ C.clear();
+}
+