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////////////////////////////////////////////////////////////////////////////// |
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// |
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// (C) Copyright Ion Gaztanaga 2014-2015. Distributed under the Boost |
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// Software License, Version 1.0. (See accompanying file |
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
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// |
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// See http://www.boost.org/libs/container for documentation. |
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// |
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////////////////////////////////////////////////////////////////////////////// |
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#ifndef BOOST_CONTAINER_DETAIL_NEXT_CAPACITY_HPP |
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#define BOOST_CONTAINER_DETAIL_NEXT_CAPACITY_HPP |
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#ifndef BOOST_CONFIG_HPP |
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# include |
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#endif |
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#if defined(BOOST_HAS_PRAGMA_ONCE) |
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# pragma once |
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#endif |
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// container |
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#include |
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// container/detail |
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#include |
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#include |
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namespace boost { |
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namespace container { |
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namespace dtl { |
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template |
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struct grow_factor_ratio |
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{ |
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BOOST_STATIC_ASSERT(Numerator > Denominator); |
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BOOST_STATIC_ASSERT(Numerator < 100); |
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BOOST_STATIC_ASSERT(Denominator < 100); |
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BOOST_STATIC_ASSERT(Denominator == 1 || (0 != Numerator % Denominator)); |
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template |
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SizeType operator()(const SizeType cur_cap, const SizeType add_min_cap, const SizeType max_cap) const |
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{ |
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const SizeType overflow_limit = ((SizeType)-1) / Numerator; |
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SizeType new_cap = 0; |
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if(cur_cap <= overflow_limit){ |
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new_cap = cur_cap * Numerator / Denominator; |
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} |
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else if(Denominator == 1 || (SizeType(new_cap = cur_cap) / Denominator) > overflow_limit){ |
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new_cap = (SizeType)-1; |
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} |
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else{ |
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new_cap *= Numerator; |
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} |
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return max_value(SizeType(Minimum), max_value(cur_cap+add_min_cap, min_value(max_cap, new_cap))); |
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} |
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}; |
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} //namespace dtl { |
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struct growth_factor_50 |
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: dtl::grow_factor_ratio<0, 3, 2> |
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{}; |
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struct growth_factor_60 |
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: dtl::grow_factor_ratio<0, 8, 5> |
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{}; |
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struct growth_factor_100 |
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: dtl::grow_factor_ratio<0, 2, 1> |
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{}; |
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} //namespace container { |
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} //namespace boost { |
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#endif //#ifndef BOOST_CONTAINER_DETAIL_NEXT_CAPACITY_HPP |