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Diffstat (limited to 'include/Support/STLExtras.h')
| -rw-r--r-- | include/Support/STLExtras.h | 310 |
1 files changed, 0 insertions, 310 deletions
diff --git a/include/Support/STLExtras.h b/include/Support/STLExtras.h deleted file mode 100644 index b6379d2..0000000 --- a/include/Support/STLExtras.h +++ /dev/null @@ -1,310 +0,0 @@ -//===- STLExtras.h - Useful functions when working with the STL -*- 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 contains some templates that are useful if you are working with the -// STL at all. -// -// No library is required when using these functinons. -// -//===----------------------------------------------------------------------===// - -#ifndef SUPPORT_STLEXTRAS_H -#define SUPPORT_STLEXTRAS_H - -#include <functional> -#include <utility> // for std::pair -#include "Support/iterator" - -namespace llvm { - -//===----------------------------------------------------------------------===// -// Extra additions to <functional> -//===----------------------------------------------------------------------===// - -// bind_obj - Often times you want to apply the member function of an object -// as a unary functor. This macro is shorthand that makes it happen less -// verbosely. -// -// Example: -// struct Summer { void accumulate(int x); } -// vector<int> Numbers; -// Summer MyS; -// for_each(Numbers.begin(), Numbers.end(), -// bind_obj(&MyS, &Summer::accumulate)); -// -// TODO: When I get lots of extra time, convert this from an evil macro -// -#define bind_obj(OBJ, METHOD) std::bind1st(std::mem_fun(METHOD), OBJ) - - -// bitwise_or - This is a simple functor that applys operator| on its two -// arguments to get a boolean result. -// -template<class Ty> -struct bitwise_or : public std::binary_function<Ty, Ty, bool> { - bool operator()(const Ty& left, const Ty& right) const { - return left | right; - } -}; - -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 { - return *right < *left; - } -}; - -// deleter - Very very very simple method that is used to invoke operator -// 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; -} - - - -//===----------------------------------------------------------------------===// -// Extra additions to <iterator> -//===----------------------------------------------------------------------===// - -// mapped_iterator - This is a simple iterator adapter that causes a function to -// be dereferenced whenever operator* is invoked on the iterator. -// -template <class RootIt, class UnaryFunc> -class mapped_iterator { - RootIt current; - UnaryFunc Fn; -public: - typedef typename std::iterator_traits<RootIt>::iterator_category - iterator_category; - typedef typename std::iterator_traits<RootIt>::difference_type - difference_type; - typedef typename UnaryFunc::result_type value_type; - - typedef void pointer; - //typedef typename UnaryFunc::result_type *pointer; - typedef void reference; // Can't modify value returned by fn - - typedef RootIt iterator_type; - typedef mapped_iterator<RootIt, UnaryFunc> _Self; - - inline RootIt &getCurrent() const { return current; } - - 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 - return Fn(*current); // little change - } - - _Self& operator++() { ++current; return *this; } - _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) { current += n; return *this; } - _Self operator- (difference_type n) const { return _Self(current - n); } - _Self& operator-= (difference_type n) { current -= n; return *this; } - 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; } - inline bool operator< (const _Self &X) const { return current < X.current; } - - inline difference_type operator-(const _Self &X) const { - return current - X.current; - } -}; - -template <class _Iterator, class 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); -} - - -// map_iterator - Provide a convenient way to create mapped_iterators, just like -// make_pair is useful for creating pairs... -// -template <class ItTy, class FuncTy> -inline mapped_iterator<ItTy, FuncTy> map_iterator(const ItTy &I, FuncTy F) { - return mapped_iterator<ItTy, FuncTy>(I, F); -} - - -// next/prior - These functions unlike std::advance do not modify the -// passed iterator but return a copy. -// -// next(myIt) returns copy of myIt incremented once -// next(myIt, n) returns copy of myIt incremented n times -// prior(myIt) returns copy of myIt decremented once -// prior(myIt, n) returns copy of myIt decremented n times - -template <typename ItTy, typename Dist> -inline ItTy next(ItTy it, Dist n) -{ - std::advance(it, n); - return it; -} - -template <typename ItTy> -inline ItTy next(ItTy it) -{ - std::advance(it, 1); - return it; -} - -template <typename ItTy, typename Dist> -inline ItTy prior(ItTy it, Dist n) -{ - std::advance(it, -n); - return it; -} - -template <typename ItTy> -inline ItTy prior(ItTy it) -{ - std::advance(it, -1); - return it; -} - - -//===----------------------------------------------------------------------===// -// Extra additions to <algorithm> -//===----------------------------------------------------------------------===// - -// apply_until - Apply a functor to a sequence continually, unless the -// functor returns true. Return true if the functor returned true, return false -// if the functor never returned true. -// -template <class InputIt, class Function> -bool apply_until(InputIt First, InputIt Last, Function Func) { - for ( ; First != Last; ++First) - if (Func(*First)) return true; - return false; -} - - -// reduce - Reduce a sequence values into a single value, given an initial -// value and an operator. -// -template <class InputIt, class Function, class ValueType> -ValueType reduce(InputIt First, InputIt Last, Function Func, ValueType Value) { - for ( ; First != Last; ++First) - Value = Func(*First, Value); - return Value; -} - -#if 1 // This is likely to be more efficient - -// reduce_apply - Reduce the result of applying a function to each value in a -// sequence, given an initial value, an operator, a function, and a sequence. -// -template <class InputIt, class Function, class ValueType, class TransFunc> -inline ValueType reduce_apply(InputIt First, InputIt Last, Function Func, - ValueType Value, TransFunc XForm) { - for ( ; First != Last; ++First) - Value = Func(XForm(*First), Value); - return Value; -} - -#else // This is arguably more elegant - -// reduce_apply - Reduce the result of applying a function to each value in a -// sequence, given an initial value, an operator, a function, and a sequence. -// -template <class InputIt, class Function, class ValueType, class TransFunc> -inline ValueType reduce_apply2(InputIt First, InputIt Last, Function Func, - ValueType Value, TransFunc XForm) { - return reduce(map_iterator(First, XForm), map_iterator(Last, XForm), - Func, Value); -} -#endif - - -// reduce_apply_bool - Reduce the result of applying a (bool returning) function -// to each value in a sequence. All of the bools returned by the mapped -// function are bitwise or'd together, and the result is returned. -// -template <class InputIt, class Function> -inline bool reduce_apply_bool(InputIt First, InputIt Last, Function Func) { - return reduce_apply(First, Last, bitwise_or<bool>(), false, Func); -} - - -// map - This function maps the specified input sequence into the specified -// output iterator, applying a unary function in between. -// -template <class InIt, class OutIt, class Functor> -inline OutIt mapto(InIt Begin, InIt End, OutIt Dest, Functor F) { - return copy(map_iterator(Begin, F), map_iterator(End, F), Dest); -} - - -//===----------------------------------------------------------------------===// -// Extra additions to <utility> -//===----------------------------------------------------------------------===// - -// tie - this function ties two objects and returns a temporary object -// that is assignable from a std::pair. This can be used to make code -// more readable when using values returned from functions bundled in -// a std::pair. Since an example is worth 1000 words: -// -// typedef std::map<int, int> Int2IntMap; -// -// Int2IntMap myMap; -// Int2IntMap::iterator where; -// bool inserted; -// tie(where, inserted) = myMap.insert(std::make_pair(123,456)); -// -// if (inserted) -// // do stuff -// else -// // do other stuff - -namespace -{ - 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; - } - }; -} - -template <typename T1, typename T2> -inline tier<T1, T2> tie(T1& f, T2& s) { - return tier<T1, T2>(f, s); -} - -} // End llvm namespace - -#endif |