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+// -*- C++ -*-
+
+// Copyright (C) 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the terms
+// of the GNU General Public License as published by the Free Software
+// Foundation; either version 3, or (at your option) any later
+// version.
+
+// This library is distributed in the hope that it will be useful, but
+// WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+// General Public License for more details.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
+// .
+
+/** @file parallel/base.h
+ * @brief Sequential helper functions.
+ * This file is a GNU parallel extension to the Standard C++ Library.
+ */
+
+// Written by Johannes Singler.
+
+#ifndef _GLIBCXX_PARALLEL_BASE_H
+#define _GLIBCXX_PARALLEL_BASE_H 1
+
+#include
+#include
+#include
+#include
+#include
+#include
+
+// Parallel mode namespaces.
+
+/**
+ * @namespace std::__parallel
+ * @brief GNU parallel code, replaces standard behavior with parallel behavior.
+ */
+namespace std _GLIBCXX_VISIBILITY(default)
+{
+ namespace __parallel { }
+}
+
+/**
+ * @namespace __gnu_parallel
+ * @brief GNU parallel code for public use.
+ */
+namespace __gnu_parallel
+{
+ // Import all the parallel versions of components in namespace std.
+ using namespace std::__parallel;
+}
+
+/**
+ * @namespace __gnu_sequential
+ * @brief GNU sequential classes for public use.
+ */
+namespace __gnu_sequential
+{
+ // Import whatever is the serial version.
+#ifdef _GLIBCXX_PARALLEL
+ using namespace std::_GLIBCXX_STD_A;
+#else
+ using namespace std;
+#endif
+}
+
+
+namespace __gnu_parallel
+{
+ // NB: Including this file cannot produce (unresolved) symbols from
+ // the OpenMP runtime unless the parallel mode is actually invoked
+ // and active, which imples that the OpenMP runtime is actually
+ // going to be linked in.
+ inline _ThreadIndex
+ __get_max_threads()
+ {
+ _ThreadIndex __i = omp_get_max_threads();
+ return __i > 1 ? __i : 1;
+ }
+
+
+ inline bool
+ __is_parallel(const _Parallelism __p) { return __p != sequential; }
+
+
+ /** @brief Calculates the rounded-down logarithm of @c __n for base 2.
+ * @param __n Argument.
+ * @return Returns 0 for any argument <1.
+ */
+ template
+ inline _Size
+ __rd_log2(_Size __n)
+ {
+ _Size __k;
+ for (__k = 0; __n > 1; __n >>= 1)
+ ++__k;
+ return __k;
+ }
+
+ /** @brief Encode two integers into one gnu_parallel::_CASable.
+ * @param __a First integer, to be encoded in the most-significant @c
+ * _CASable_bits/2 bits.
+ * @param __b Second integer, to be encoded in the least-significant
+ * @c _CASable_bits/2 bits.
+ * @return value encoding @c __a and @c __b.
+ * @see __decode2
+ */
+ inline _CASable
+ __encode2(int __a, int __b) //must all be non-negative, actually
+ {
+ return (((_CASable)__a) << (_CASable_bits / 2)) | (((_CASable)__b) << 0);
+ }
+
+ /** @brief Decode two integers from one gnu_parallel::_CASable.
+ * @param __x __gnu_parallel::_CASable to decode integers from.
+ * @param __a First integer, to be decoded from the most-significant
+ * @c _CASable_bits/2 bits of @c __x.
+ * @param __b Second integer, to be encoded in the least-significant
+ * @c _CASable_bits/2 bits of @c __x.
+ * @see __encode2
+ */
+ inline void
+ __decode2(_CASable __x, int& __a, int& __b)
+ {
+ __a = (int)((__x >> (_CASable_bits / 2)) & _CASable_mask);
+ __b = (int)((__x >> 0 ) & _CASable_mask);
+ }
+
+ //needed for parallel "numeric", even if "algorithm" not included
+
+ /** @brief Equivalent to std::min. */
+ template
+ inline const _Tp&
+ min(const _Tp& __a, const _Tp& __b)
+ { return (__a < __b) ? __a : __b; }
+
+ /** @brief Equivalent to std::max. */
+ template
+ inline const _Tp&
+ max(const _Tp& __a, const _Tp& __b)
+ { return (__a > __b) ? __a : __b; }
+
+ /** @brief Constructs predicate for equality from strict weak
+ * ordering predicate
+ */
+ template
+ class _EqualFromLess : public std::binary_function<_T1, _T2, bool>
+ {
+ private:
+ _Compare& _M_comp;
+
+ public:
+ _EqualFromLess(_Compare& __comp) : _M_comp(__comp) { }
+
+ bool operator()(const _T1& __a, const _T2& __b)
+ { return !_M_comp(__a, __b) && !_M_comp(__b, __a); }
+ };
+
+
+ /** @brief Similar to std::unary_negate,
+ * but giving the argument types explicitly. */
+ template
+ class __unary_negate
+ : public std::unary_function
+ {
+ protected:
+ _Predicate _M_pred;
+
+ public:
+ explicit
+ __unary_negate(const _Predicate& __x) : _M_pred(__x) { }
+
+ bool
+ operator()(const argument_type& __x)
+ { return !_M_pred(__x); }
+ };
+
+ /** @brief Similar to std::binder1st,
+ * but giving the argument types explicitly. */
+ template
+ class __binder1st
+ : public std::unary_function<_SecondArgumentType, _ResultType>
+ {
+ protected:
+ _Operation _M_op;
+ _FirstArgumentType _M_value;
+
+ public:
+ __binder1st(const _Operation& __x, const _FirstArgumentType& __y)
+ : _M_op(__x), _M_value(__y) { }
+
+ _ResultType
+ operator()(const _SecondArgumentType& __x)
+ { return _M_op(_M_value, __x); }
+
+ // _GLIBCXX_RESOLVE_LIB_DEFECTS
+ // 109. Missing binders for non-const sequence elements
+ _ResultType
+ operator()(_SecondArgumentType& __x) const
+ { return _M_op(_M_value, __x); }
+ };
+
+ /**
+ * @brief Similar to std::binder2nd, but giving the argument types
+ * explicitly.
+ */
+ template
+ class __binder2nd
+ : public std::unary_function<_FirstArgumentType, _ResultType>
+ {
+ protected:
+ _Operation _M_op;
+ _SecondArgumentType _M_value;
+
+ public:
+ __binder2nd(const _Operation& __x, const _SecondArgumentType& __y)
+ : _M_op(__x), _M_value(__y) { }
+
+ _ResultType
+ operator()(const _FirstArgumentType& __x) const
+ { return _M_op(__x, _M_value); }
+
+ // _GLIBCXX_RESOLVE_LIB_DEFECTS
+ // 109. Missing binders for non-const sequence elements
+ _ResultType
+ operator()(_FirstArgumentType& __x)
+ { return _M_op(__x, _M_value); }
+ };
+
+ /** @brief Similar to std::equal_to, but allows two different types. */
+ template
+ struct _EqualTo : std::binary_function<_T1, _T2, bool>
+ {
+ bool operator()(const _T1& __t1, const _T2& __t2) const
+ { return __t1 == __t2; }
+ };
+
+ /** @brief Similar to std::less, but allows two different types. */
+ template
+ struct _Less : std::binary_function<_T1, _T2, bool>
+ {
+ bool
+ operator()(const _T1& __t1, const _T2& __t2) const
+ { return __t1 < __t2; }
+
+ bool
+ operator()(const _T2& __t2, const _T1& __t1) const
+ { return __t2 < __t1; }
+ };
+
+ // Partial specialization for one type. Same as std::less.
+ template
+ struct _Less<_Tp, _Tp>
+ : public std::less<_Tp> { };
+
+ /** @brief Similar to std::plus, but allows two different types. */
+ template(0)
+ + *static_cast<_Tp2*>(0))>
+ struct _Plus : public std::binary_function<_Tp1, _Tp2, _Result>
+ {
+ _Result
+ operator()(const _Tp1& __x, const _Tp2& __y) const
+ { return __x + __y; }
+ };
+
+ // Partial specialization for one type. Same as std::plus.
+ template
+ struct _Plus<_Tp, _Tp, _Tp>
+ : public std::plus<_Tp> { };
+
+ /** @brief Similar to std::multiplies, but allows two different types. */
+ template(0)
+ * *static_cast<_Tp2*>(0))>
+ struct _Multiplies : public std::binary_function<_Tp1, _Tp2, _Result>
+ {
+ _Result
+ operator()(const _Tp1& __x, const _Tp2& __y) const
+ { return __x * __y; }
+ };
+
+ // Partial specialization for one type. Same as std::multiplies.
+ template
+ struct _Multiplies<_Tp, _Tp, _Tp>
+ : public std::multiplies<_Tp> { };
+
+ /** @brief _Iterator associated with __gnu_parallel::_PseudoSequence.
+ * If features the usual random-access iterator functionality.
+ * @param _Tp Sequence _M_value type.
+ * @param _DifferenceTp Sequence difference type.
+ */
+ template
+ class _PseudoSequenceIterator
+ {
+ public:
+ typedef _DifferenceTp _DifferenceType;
+
+ _PseudoSequenceIterator(const _Tp& __val, _DifferenceType __pos)
+ : _M_val(__val), _M_pos(__pos) { }
+
+ // Pre-increment operator.
+ _PseudoSequenceIterator&
+ operator++()
+ {
+ ++_M_pos;
+ return *this;
+ }
+
+ // Post-increment operator.
+ _PseudoSequenceIterator
+ operator++(int)
+ { return _PseudoSequenceIterator(_M_pos++); }
+
+ const _Tp&
+ operator*() const
+ { return _M_val; }
+
+ const _Tp&
+ operator[](_DifferenceType) const
+ { return _M_val; }
+
+ bool
+ operator==(const _PseudoSequenceIterator& __i2)
+ { return _M_pos == __i2._M_pos; }
+
+ bool
+ operator!=(const _PseudoSequenceIterator& __i2)
+ { return _M_pos != __i2._M_pos; }
+
+ _DifferenceType
+ operator-(const _PseudoSequenceIterator& __i2)
+ { return _M_pos - __i2._M_pos; }
+
+ private:
+ const _Tp& _M_val;
+ _DifferenceType _M_pos;
+ };
+
+ /** @brief Sequence that conceptually consists of multiple copies of
+ the same element.
+ * The copies are not stored explicitly, of course.
+ * @param _Tp Sequence _M_value type.
+ * @param _DifferenceTp Sequence difference type.
+ */
+ template
+ class _PseudoSequence
+ {
+ public:
+ typedef _DifferenceTp _DifferenceType;
+
+ // Better cast down to uint64_t, than up to _DifferenceTp.
+ typedef _PseudoSequenceIterator<_Tp, uint64_t> iterator;
+
+ /** @brief Constructor.
+ * @param __val Element of the sequence.
+ * @param __count Number of (virtual) copies.
+ */
+ _PseudoSequence(const _Tp& __val, _DifferenceType __count)
+ : _M_val(__val), _M_count(__count) { }
+
+ /** @brief Begin iterator. */
+ iterator
+ begin() const
+ { return iterator(_M_val, 0); }
+
+ /** @brief End iterator. */
+ iterator
+ end() const
+ { return iterator(_M_val, _M_count); }
+
+ private:
+ const _Tp& _M_val;
+ _DifferenceType _M_count;
+ };
+
+ /** @brief Compute the median of three referenced elements,
+ according to @c __comp.
+ * @param __a First iterator.
+ * @param __b Second iterator.
+ * @param __c Third iterator.
+ * @param __comp Comparator.
+ */
+ template
+ _RAIter
+ __median_of_three_iterators(_RAIter __a, _RAIter __b,
+ _RAIter __c, _Compare __comp)
+ {
+ if (__comp(*__a, *__b))
+ if (__comp(*__b, *__c))
+ return __b;
+ else
+ if (__comp(*__a, *__c))
+ return __c;
+ else
+ return __a;
+ else
+ {
+ // Just swap __a and __b.
+ if (__comp(*__a, *__c))
+ return __a;
+ else
+ if (__comp(*__b, *__c))
+ return __c;
+ else
+ return __b;
+ }
+ }
+
+#define _GLIBCXX_PARALLEL_ASSERT(_Condition) __glibcxx_assert(_Condition)
+
+} //namespace __gnu_parallel
+
+#endif /* _GLIBCXX_PARALLEL_BASE_H */