| 1 | /* Used in Boost.MultiIndex tests. |
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| 2 | * |
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| 3 | * Copyright 2003-2020 Joaquin M Lopez Munoz. |
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| 4 | * Distributed under the Boost Software License, Version 1.0. |
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| 5 | * (See accompanying file LICENSE_1_0.txt or copy at |
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| 6 | * http://www.boost.org/LICENSE_1_0.txt) |
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| 7 | * |
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| 8 | * See http://www.boost.org/libs/multi_index for library home page. |
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| 9 | */ |
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| 10 | |
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| 11 | #ifndef BOOST_MULTI_INDEX_TEST_ROOTED_ALLOCATOR_HPP |
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| 12 | #define BOOST_MULTI_INDEX_TEST_ROOTED_ALLOCATOR_HPP |
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| 13 | |
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| 14 | #include <boost/config.hpp> /* keep it first to prevent nasty warns in MSVC */ |
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| 15 | #include <boost/type_traits/integral_constant.hpp> |
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| 16 | #include <memory> |
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| 17 | |
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| 18 | #if defined(BOOST_MSVC) |
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| 19 | #pragma warning(push) |
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| 20 | #pragma warning(disable:4355) /* this used in base member initializer list */ |
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| 21 | #endif |
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| 22 | |
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| 23 | template<typename T,bool Propagate,bool AlwaysEqual> |
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| 24 | class rooted_allocator:public std::allocator<T> |
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| 25 | { |
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| 26 | typedef boost::integral_constant<bool,Propagate> propagate_type; |
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| 27 | typedef boost::integral_constant<bool,AlwaysEqual> always_equal_type; |
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| 28 | |
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| 29 | public: |
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| 30 | typedef propagate_type propagate_on_container_copy_assignment; |
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| 31 | typedef propagate_type propagate_on_container_move_assignment; |
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| 32 | typedef propagate_type propagate_on_container_swap; |
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| 33 | typedef always_equal_type is_always_equal; |
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| 34 | template<typename U> |
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| 35 | struct rebind{typedef rooted_allocator<U,Propagate,AlwaysEqual> other;}; |
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| 36 | |
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| 37 | rooted_allocator():root(0){} |
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| 38 | explicit rooted_allocator(int):root(this){} |
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| 39 | template<typename U> |
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| 40 | rooted_allocator(const rooted_allocator<U,Propagate,AlwaysEqual>& x): |
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| 41 | root(x.root){} |
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| 42 | |
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| 43 | template<typename U> |
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| 44 | bool operator==(const rooted_allocator<U,Propagate,AlwaysEqual>& x)const |
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| 45 | {return AlwaysEqual?true:root==x.root;} |
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| 46 | template<typename U> |
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| 47 | bool operator!=(const rooted_allocator<U,Propagate,AlwaysEqual>& x)const |
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| 48 | {return !(*this==x);} |
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| 49 | |
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| 50 | template<typename U> |
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| 51 | bool comes_from(const rooted_allocator<U,Propagate,AlwaysEqual>& x)const |
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| 52 | {return root==&x;} |
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| 53 | |
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| 54 | private: |
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| 55 | template<typename,bool,bool> friend class rooted_allocator; |
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| 56 | |
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| 57 | const void* root; |
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| 58 | }; |
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| 59 | |
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| 60 | #if defined(BOOST_MSVC) |
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| 61 | #pragma warning(pop) /* C4355 */ |
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| 62 | #endif |
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| 63 | |
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| 64 | #endif |
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| 65 | |
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