//===- llvm/ADT/STLExtras.h - Useful STL related functions ------*- C++ -*-===//
-//
+//
// The LLVM Compiler Infrastructure
//
-// This file was developed by the LLVM research group and is distributed under
-// the University of Illinois Open Source License. See LICENSE.TXT for details.
-//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
//===----------------------------------------------------------------------===//
//
// This file contains some templates that are useful if you are working with the
// STL at all.
//
-// No library is required when using these functinons.
+// No library is required when using these functions.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_ADT_STLEXTRAS_H
#define LLVM_ADT_STLEXTRAS_H
+#include <cstddef> // for std::size_t
+#include <cstdlib> // for qsort
#include <functional>
+#include <iterator>
#include <utility> // for std::pair
-#include "llvm/ADT/iterator"
namespace llvm {
// Extra additions to <functional>
//===----------------------------------------------------------------------===//
+template<class Ty>
+struct identity : public std::unary_function<Ty, Ty> {
+ Ty &operator()(Ty &self) const {
+ return self;
+ }
+ const Ty &operator()(const Ty &self) const {
+ return self;
+ }
+};
+
+template<class Ty>
+struct less_ptr : public std::binary_function<Ty, Ty, bool> {
+ bool operator()(const Ty* left, const Ty* right) const {
+ return *left < *right;
+ }
+};
+
template<class Ty>
struct greater_ptr : public std::binary_function<Ty, Ty, bool> {
bool operator()(const Ty* left, const Ty* right) const {
};
// deleter - Very very very simple method that is used to invoke operator
-// delete on something. It is used like this:
+// delete on something. It is used like this:
//
// for_each(V.begin(), B.end(), deleter<Interval>);
//
-template <class T>
-static inline void deleter(T *Ptr) {
- delete Ptr;
+template <class T>
+inline void deleter(T *Ptr) {
+ delete Ptr;
}
typedef RootIt iterator_type;
typedef mapped_iterator<RootIt, UnaryFunc> _Self;
- inline RootIt &getCurrent() const { return current; }
+ inline const RootIt &getCurrent() const { return current; }
+ inline const UnaryFunc &getFunc() const { return Fn; }
inline explicit mapped_iterator(const RootIt &I, UnaryFunc F)
: current(I), Fn(F) {}
inline mapped_iterator(const mapped_iterator &It)
: current(It.current), Fn(It.Fn) {}
- inline value_type operator*() const { // All this work to do this
+ inline value_type operator*() const { // All this work to do this
return Fn(*current); // little change
}
_Self& operator--() { --current; return *this; }
_Self operator++(int) { _Self __tmp = *this; ++current; return __tmp; }
_Self operator--(int) { _Self __tmp = *this; --current; return __tmp; }
- _Self operator+ (difference_type n) const { return _Self(current + n); }
+ _Self operator+ (difference_type n) const {
+ return _Self(current + n, Fn);
+ }
_Self& operator+= (difference_type n) { current += n; return *this; }
- _Self operator- (difference_type n) const { return _Self(current - n); }
+ _Self operator- (difference_type n) const {
+ return _Self(current - n, Fn);
+ }
_Self& operator-= (difference_type n) { current -= n; return *this; }
- reference operator[](difference_type n) const { return *(*this + n); }
+ reference operator[](difference_type n) const { return *(*this + n); }
inline bool operator!=(const _Self &X) const { return !operator==(X); }
inline bool operator==(const _Self &X) const { return current == X.current; }
};
template <class _Iterator, class Func>
-inline mapped_iterator<_Iterator, Func>
+inline mapped_iterator<_Iterator, Func>
operator+(typename mapped_iterator<_Iterator, Func>::difference_type N,
const mapped_iterator<_Iterator, Func>& X) {
- return mapped_iterator<_Iterator, Func>(X.getCurrent() - N);
+ return mapped_iterator<_Iterator, Func>(X.getCurrent() - N, X.getFunc());
}
template <typename ItTy>
inline ItTy next(ItTy it)
{
- std::advance(it, 1);
- return it;
+ return ++it;
}
template <typename ItTy, typename Dist>
template <typename ItTy>
inline ItTy prior(ItTy it)
{
- std::advance(it, -1);
- return it;
+ return --it;
}
//===----------------------------------------------------------------------===//
// a std::pair. Since an example is worth 1000 words:
//
// typedef std::map<int, int> Int2IntMap;
-//
+//
// Int2IntMap myMap;
// Int2IntMap::iterator where;
// bool inserted;
// // do stuff
// else
// // do other stuff
+template <typename T1, typename T2>
+struct tier {
+ typedef T1 &first_type;
+ typedef T2 &second_type;
+
+ first_type first;
+ second_type second;
+
+ tier(first_type f, second_type s) : first(f), second(s) { }
+ tier& operator=(const std::pair<T1, T2>& p) {
+ first = p.first;
+ second = p.second;
+ return *this;
+ }
+};
-namespace
-{
- template <typename T1, typename T2>
- struct tier {
- typedef T1 &first_type;
- typedef T2 &second_type;
+template <typename T1, typename T2>
+inline tier<T1, T2> tie(T1& f, T2& s) {
+ return tier<T1, T2>(f, s);
+}
- first_type first;
- second_type second;
+//===----------------------------------------------------------------------===//
+// Extra additions for arrays
+//===----------------------------------------------------------------------===//
- tier(first_type f, second_type s) : first(f), second(s) { }
- tier& operator=(const std::pair<T1, T2>& p) {
- first = p.first;
- second = p.second;
- return *this;
- }
- };
+/// 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;
}
-template <typename T1, typename T2>
-inline tier<T1, T2> tie(T1& f, T2& s) {
- return tier<T1, T2>(f, s);
+/// 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();
}
} // End llvm namespace
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