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Diffstat (limited to 'libstdc++/stl/stl_numeric.h')
-rw-r--r-- | libstdc++/stl/stl_numeric.h | 196 |
1 files changed, 196 insertions, 0 deletions
diff --git a/libstdc++/stl/stl_numeric.h b/libstdc++/stl/stl_numeric.h new file mode 100644 index 00000000000..57fee2b1b5c --- /dev/null +++ b/libstdc++/stl/stl_numeric.h @@ -0,0 +1,196 @@ +/* + * + * Copyright (c) 1994 + * Hewlett-Packard Company + * + * Permission to use, copy, modify, distribute and sell this software + * and its documentation for any purpose is hereby granted without fee, + * provided that the above copyright notice appear in all copies and + * that both that copyright notice and this permission notice appear + * in supporting documentation. Hewlett-Packard Company makes no + * representations about the suitability of this software for any + * purpose. It is provided "as is" without express or implied warranty. + * + * + * Copyright (c) 1996,1997 + * Silicon Graphics Computer Systems, Inc. + * + * Permission to use, copy, modify, distribute and sell this software + * and its documentation for any purpose is hereby granted without fee, + * provided that the above copyright notice appear in all copies and + * that both that copyright notice and this permission notice appear + * in supporting documentation. Silicon Graphics makes no + * representations about the suitability of this software for any + * purpose. It is provided "as is" without express or implied warranty. + */ + +/* NOTE: This is an internal header file, included by other STL headers. + * You should not attempt to use it directly. + */ + + +#ifndef __SGI_STL_INTERNAL_NUMERIC_H +#define __SGI_STL_INTERNAL_NUMERIC_H + +__STL_BEGIN_NAMESPACE + +template <class InputIterator, class T> +T accumulate(InputIterator first, InputIterator last, T init) { + for ( ; first != last; ++first) + init = init + *first; + return init; +} + +template <class InputIterator, class T, class BinaryOperation> +T accumulate(InputIterator first, InputIterator last, T init, + BinaryOperation binary_op) { + for ( ; first != last; ++first) + init = binary_op(init, *first); + return init; +} + +template <class InputIterator1, class InputIterator2, class T> +T inner_product(InputIterator1 first1, InputIterator1 last1, + InputIterator2 first2, T init) { + for ( ; first1 != last1; ++first1, ++first2) + init = init + (*first1 * *first2); + return init; +} + +template <class InputIterator1, class InputIterator2, class T, + class BinaryOperation1, class BinaryOperation2> +T inner_product(InputIterator1 first1, InputIterator1 last1, + InputIterator2 first2, T init, BinaryOperation1 binary_op1, + BinaryOperation2 binary_op2) { + for ( ; first1 != last1; ++first1, ++first2) + init = binary_op1(init, binary_op2(*first1, *first2)); + return init; +} + +template <class InputIterator, class OutputIterator, class T> +OutputIterator __partial_sum(InputIterator first, InputIterator last, + OutputIterator result, T*) { + T value = *first; + while (++first != last) { + value = value + *first; + *++result = value; + } + return ++result; +} + +template <class InputIterator, class OutputIterator> +OutputIterator partial_sum(InputIterator first, InputIterator last, + OutputIterator result) { + if (first == last) return result; + *result = *first; + return __partial_sum(first, last, result, value_type(first)); +} + +template <class InputIterator, class OutputIterator, class T, + class BinaryOperation> +OutputIterator __partial_sum(InputIterator first, InputIterator last, + OutputIterator result, T*, + BinaryOperation binary_op) { + T value = *first; + while (++first != last) { + value = binary_op(value, *first); + *++result = value; + } + return ++result; +} + +template <class InputIterator, class OutputIterator, class BinaryOperation> +OutputIterator partial_sum(InputIterator first, InputIterator last, + OutputIterator result, BinaryOperation binary_op) { + if (first == last) return result; + *result = *first; + return __partial_sum(first, last, result, value_type(first), binary_op); +} + +template <class InputIterator, class OutputIterator, class T> +OutputIterator __adjacent_difference(InputIterator first, InputIterator last, + OutputIterator result, T*) { + T value = *first; + while (++first != last) { + T tmp = *first; + *++result = tmp - value; + value = tmp; + } + return ++result; +} + +template <class InputIterator, class OutputIterator> +OutputIterator adjacent_difference(InputIterator first, InputIterator last, + OutputIterator result) { + if (first == last) return result; + *result = *first; + return __adjacent_difference(first, last, result, value_type(first)); +} + +template <class InputIterator, class OutputIterator, class T, + class BinaryOperation> +OutputIterator __adjacent_difference(InputIterator first, InputIterator last, + OutputIterator result, T*, + BinaryOperation binary_op) { + T value = *first; + while (++first != last) { + T tmp = *first; + *++result = binary_op(tmp, value); + value = tmp; + } + return ++result; +} + +template <class InputIterator, class OutputIterator, class BinaryOperation> +OutputIterator adjacent_difference(InputIterator first, InputIterator last, + OutputIterator result, + BinaryOperation binary_op) { + if (first == last) return result; + *result = *first; + return __adjacent_difference(first, last, result, value_type(first), + binary_op); +} + +// Returns x ** n, where n >= 0. Note that "multiplication" +// is required to be associative, but not necessarily commutative. + +template <class T, class Integer, class MonoidOperation> +T power(T x, Integer n, MonoidOperation op) { + if (n == 0) + return identity_element(op); + else { + while ((n & 1) == 0) { + n >>= 1; + x = op(x, x); + } + + T result = x; + n >>= 1; + while (n != 0) { + x = op(x, x); + if ((n & 1) != 0) + result = op(result, x); + n >>= 1; + } + return result; + } +} + +template <class T, class Integer> +inline T power(T x, Integer n) { + return power(x, n, multiplies<T>()); +} + + +template <class ForwardIterator, class T> +void iota(ForwardIterator first, ForwardIterator last, T value) { + while (first != last) *first++ = value++; +} + +__STL_END_NAMESPACE + +#endif /* __SGI_STL_INTERNAL_NUMERIC_H */ + +// Local Variables: +// mode:C++ +// End: |