| author | sl |
| Tue, 10 Jun 2014 14:32:02 +0200 | |
| changeset 1 | 260cb5ec6c19 |
| permissions | -rw-r--r-- |
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// last_value function object (documented as part of Boost.Signals) |
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// Copyright Douglas Gregor 2001-2003. Use, modification and |
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// distribution is subject to the Boost Software License, Version |
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// 1.0. (See accompanying file LICENSE_1_0.txt or copy at |
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// http://www.boost.org/LICENSE_1_0.txt) |
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|
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// For more information, see http://www.boost.org/libs/signals |
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|
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#ifndef BOOST_LAST_VALUE_HPP |
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#define BOOST_LAST_VALUE_HPP |
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|
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#include <cassert> |
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|
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namespace boost {
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template<typename T> |
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struct last_value {
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typedef T result_type; |
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|
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template<typename InputIterator> |
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T operator()(InputIterator first, InputIterator last) const |
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{
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assert(first != last); |
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T value = *first++; |
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while (first != last) |
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value = *first++; |
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return value; |
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} |
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}; |
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|
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template<> |
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struct last_value<void> {
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struct unusable {};
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public: |
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typedef unusable result_type; |
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|
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template<typename InputIterator> |
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result_type |
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operator()(InputIterator first, InputIterator last) const |
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{
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while (first != last) |
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*first++; |
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return result_type(); |
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} |
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}; |
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} |
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#endif // BOOST_SIGNALS_LAST_VALUE_HPP |