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Diffstat (limited to 'boost/algorithm/cxx11/iota.hpp')
-rw-r--r-- | boost/algorithm/cxx11/iota.hpp | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/boost/algorithm/cxx11/iota.hpp b/boost/algorithm/cxx11/iota.hpp new file mode 100644 index 0000000000..b4f0dafa6d --- /dev/null +++ b/boost/algorithm/cxx11/iota.hpp @@ -0,0 +1,74 @@ +/* + Copyright (c) Marshall Clow 2008-2012. + + Distributed under the Boost Software License, Version 1.0. (See accompanying + file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) +*/ + +/// \file iota.hpp +/// \brief Generate an increasing series +/// \author Marshall Clow + +#ifndef BOOST_ALGORITHM_IOTA_HPP +#define BOOST_ALGORITHM_IOTA_HPP + +#include <numeric> + +#include <boost/range/begin.hpp> +#include <boost/range/end.hpp> + +namespace boost { namespace algorithm { + +#if __cplusplus >= 201103L +// Use the C++11 versions of iota if it is available +using std::iota; // Section 26.7.6 +#else +/// \fn iota ( ForwardIterator first, ForwardIterator last, T value ) +/// \brief Generates an increasing sequence of values, and stores them in [first, last) +/// +/// \param first The start of the input sequence +/// \param last One past the end of the input sequence +/// \param value The initial value of the sequence to be generated +/// \note This function is part of the C++2011 standard library. +/// We will use the standard one if it is available, +/// otherwise we have our own implementation. +template <typename ForwardIterator, typename T> +void iota ( ForwardIterator first, ForwardIterator last, T value ) +{ + for ( ; first != last; ++first, ++value ) + *first = value; +} +#endif + +/// \fn iota ( Range &r, T value ) +/// \brief Generates an increasing sequence of values, and stores them in the input Range. +/// +/// \param r The input range +/// \param value The initial value of the sequence to be generated +/// +template <typename Range, typename T> +void iota ( Range &r, T value ) +{ + boost::algorithm::iota (boost::begin(r), boost::end(r), value); +} + + +/// \fn iota_n ( OutputIterator out, T value, std::size_t n ) +/// \brief Generates an increasing sequence of values, and stores them in the input Range. +/// +/// \param out An output iterator to write the results into +/// \param value The initial value of the sequence to be generated +/// \param n The number of items to write +/// +template <typename OutputIterator, typename T> +OutputIterator iota_n ( OutputIterator out, T value, std::size_t n ) +{ + while ( n-- > 0 ) + *out++ = value++; + + return out; +} + +}} + +#endif // BOOST_ALGORITHM_IOTA_HPP |