我正在尝试在共享内存中使用boost MultiIndex容器，我使用replace函数来更新记录，在尝试编译时，编译器抱怨operator =不存在所以我重载了operator =如图所示在下面的代码中，但似乎抛出的编译错误是由于分配器。这是我第一次使用自定义分配器来共享内存。在使用自定义分配器重载operator = for strings时，我们需要做些什么特别的事情吗？
1 #include <boost/interprocess/managed_shared_memory.hpp>
2 #include <boost/interprocess/allocators/allocator.hpp>
3 #include <boost/interprocess/containers/string.hpp>
4
5 #include <boost/multi_index_container.hpp>
6 #include <boost/multi_index/member.hpp>
7 #include <boost/multi_index/ordered_index.hpp>
8 #include <iostream>
9
10 using namespace boost::interprocess;
11 namespace bmi = boost::multi_index;
12
13 typedef managed_shared_memory::allocator<char>::type char_allocator;
14 typedef basic_string<char, std::char_traits<char>, char_allocator> shm_string;
15
16 //Data to insert in shared memory
17 struct tickerUpdateInfo
18 {
19 shm_string id;
20 shm_string symbol;
21 int last_update_time;
22
23 tickerUpdateInfo( const char * id_,
24 const char *symbol_,
25 int last_update_time_,
26 const char_allocator &a)
27 : id(id_, a), symbol(symbol_, a), last_update_time(last_update_time_) {
28 }
29
30 tickerUpdateInfo& operator=(const tickerUpdateInfo& other)
31 {
32 if (this != &other) {
33 id = other.id;
34 symbol = other.symbol;
35 last_update_time = other.last_update_time;
36 }
37 return *this;
38 }
39 };
40
41 std::ostream& operator<<(std::ostream& os, const tickerUpdateInfo& obj)
42 {
43 // write obj to stream
44 os << obj.id << " ";
45 os << obj.symbol << " ";
46 os << obj.last_update_time << " " << std::endl;
47 return os;
48 };
49
50
51 //Tags
52 struct id{};
53 struct symbol{};
54 struct last_update_time{};
55
56 // Define a multi_index_container of tickerUpdateInfos with following indices:
57 // - a unique index sorted by tickerUpdateInfo::id,
58 // - a unique index sorted by tickerUpdateInfo::symbol,
59 // - a non-unique index sorted by tickerUpdateInfo::last_update_time.
60 typedef bmi::multi_index_container<
61 tickerUpdateInfo,
62 bmi::indexed_by<
63 bmi::ordered_unique
64 <bmi::tag<id>, BOOST_MULTI_INDEX_MEMBER( tickerUpdateInfo, shm_string, id)>,
65 bmi::ordered_unique<
66 bmi::tag<symbol>,BOOST_MULTI_INDEX_MEMBER(tickerUpdateInfo, shm_string, symbol)>,
67 bmi::ordered_non_unique
68 <bmi::tag<last_update_time>, BOOST_MULTI_INDEX_MEMBER(tickerUpdateInfo, int, last_update_time)> >,
69 managed_shared_memory::allocator<tickerUpdateInfo>::type
70 > tickerUpdateInfo_set;
71
72 int main ()
73 {
74 //Remove shared memory on construction and destruction
75 struct shm_remove
76 {
77 shm_remove() { shared_memory_object::remove("MySharedMemory"); }
78 ~shm_remove(){ shared_memory_object::remove("MySharedMemory"); }
79 } remover;
80
81 //Create shared memory
82 managed_shared_memory segment(create_only,"MySharedMemory", 65536);
83
84 //Construct the multi_index in shared memory
85 tickerUpdateInfo_set *es = segment.construct<tickerUpdateInfo_set>
86 ("TickerUpdateContainer") //Container's name in shared memory
87 ( tickerUpdateInfo_set::ctor_args_list()
88 , segment.get_allocator<tickerUpdateInfo>()); //Ctor parameters
89
90 //Now insert elements
91 char_allocator ca(segment.get_allocator<char>());
92 es->insert(tickerUpdateInfo("0","Joe", 31,ca));
93 es->insert(tickerUpdateInfo("1", "Robert",27, ca));
94 es->insert(tickerUpdateInfo( "2","John", 36,ca));
95 const tickerUpdateInfo_set::nth_index<1>::type& name_index = (*es).get<1>();
96 std::cout << "Before update " << std::endl;
97 std::copy(
98 name_index.begin(),name_index.end(),
99 std::ostream_iterator<tickerUpdateInfo>(std::cout));
100
101
102 typedef tickerUpdateInfo_set::index<symbol>::type ticker_update_info_set_by_symbol;
103 ticker_update_info_set_by_symbol & nm_index = (*es).get<symbol>();
104 ticker_update_info_set_by_symbol::iterator it=nm_index.find("Joe");
105 tickerUpdateInfo ticker_info = *it;
106 ticker_info.symbol = "Deb"; // update key
107 nm_index.replace(it, ticker_info ); // update her record
108 std::cout << "After update " << std::endl;
109 std::copy(
110 nm_index.begin(),nm_index.end(),
111 std::ostream_iterator<tickerUpdateInfo>(std::cout));
112 return 0;
113 }
编译错误：
-- Compiling src/writer.cxx
In file included from include/boost/multi_index/ordered_index.hpp:56,
from src/writer.cxx:7:
include/boost/multi_index/detail/ord_index_ops.hpp: In constructor 'boost::container::basic_string<CharT, Traits, Alloc>::basic_string(const CharT*, const A&) [with CharT = char, Traits = std::char_traits<char>, A = boost::interprocess::allocator<char, boost::interprocess::segment_manager<char, boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_family, boost::interprocess::offset_ptr<void>, 0ul>, boost::interprocess::iset_index> >]':
include/boost/multi_index/detail/ord_index_ops.hpp:67: instantiated from 'Node* boost::multi_index::detail::ordered_index_find(Node*, Node*, const KeyFromValue&, const CompatibleKey&, const CompatibleCompare&) [with Node = boost::multi_index::detail::ordered_index_node<boost::multi_index::detail::ordered_index_node<boost::multi_index::detail::index_node_base<tickerUpdateInfo, boost::interprocess::allocator<tickerUpdateInfo, boost::interprocess::segment_manager<char, boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_family, boost::interprocess::offset_ptr<void>, 0ul>, boost::interprocess::iset_index> > > > >, KeyFromValue = boost::multi_index::member<tickerUpdateInfo, boost::container::basic_string<char, std::char_traits<char>, boost::interprocess::allocator<char, boost::interprocess::segment_manager<char, boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_family, boost::interprocess::offset_ptr<void>, 0ul>, boost::interprocess::iset_index> > >, &tickerUpdateInfo::symbol>, CompatibleKey = char [4], CompatibleCompare = std::less<boost::container::basic_string<char, std::char_traits<char>, boost::interprocess::allocator<char, boost::interprocess::segment_manager<char, boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_family, boost::interprocess::offset_ptr<void>, 0ul>, boost::interprocess::iset_index> > > >]'
include/boost/multi_index/ordered_index.hpp:434: instantiated from 'boost::multi_index::detail::bidir_node_iterator<boost::multi_index::detail::ordered_index_node<typename SuperMeta::type::node_type> > boost::multi_index::detail::ordered_index<KeyFromValue, Compare, SuperMeta, TagList, Category>::find(const CompatibleKey&) const [with CompatibleKey = char [4], KeyFromValue = boost::multi_index::member<tickerUpdateInfo, boost::container::basic_string<char, std::char_traits<char>, boost::interprocess::allocator<char, boost::interprocess::segment_manager<char, boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_family, boost::interprocess::offset_ptr<void>, 0ul>, boost::interprocess::iset_index> > >, &tickerUpdateInfo::symbol>, Compare = std::less<boost::container::basic_string<char, std::char_traits<char>, boost::interprocess::allocator<char, boost::interprocess::segment_manager<char, boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_family, boost::interprocess::offset_ptr<void>, 0ul>, boost::interprocess::iset_index> > > >, SuperMeta = boost::multi_index::detail::nth_layer<2, tickerUpdateInfo, boost::multi_index::indexed_by<boost::multi_index::ordered_unique<boost::multi_index::tag<id, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na>, boost::multi_index::member<tickerUpdateInfo, boost::container::basic_string<char, std::char_traits<char>, boost::interprocess::allocator<char, boost::interprocess::segment_manager<char, boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_family, boost::interprocess::offset_ptr<void>, 0ul>, boost::interprocess::iset_index> > >, &tickerUpdateInfo::id>, mpl_::na>, boost::multi_index::ordered_unique<boost::multi_index::tag<symbol, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na>, boost::multi_index::member<tickerUpdateInfo, boost::container::basic_string<char, std::char_traits<char>, boost::interprocess::allocator<char, boost::interprocess::segment_manager<char, boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_family, boost::interprocess::offset_ptr<void>, 0ul>, boost::interprocess::iset_index> > >, &tickerUpdateInfo::symbol>, mpl_::na>, boost::multi_index::ordered_non_unique<boost::multi_index::tag<last_update_time, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na>, boost::multi_index::member<tickerUpdateInfo, int, &tickerUpdateInfo::last_update_time>, mpl_::na>, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na>, boost::interprocess::allocator<tickerUpdateInfo, boost::interprocess::segment_manager<char, boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_family, boost::interprocess::offset_ptr<void>, 0ul>, boost::interprocess::iset_index> > >, TagList = boost::mpl::v_item<symbol, boost::mpl::vector0<mpl_::na>, 0>, Category = boost::multi_index::detail::ordered_unique_tag]'
src/writer.cxx:107: instantiated from here
include/boost/multi_index/detail/ord_index_ops.hpp:67: error: no matching function for call to 'boost::interprocess::allocator<char, boost::interprocess::segment_manager<char, boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_family, boost::interprocess::offset_ptr<void>, 0ul>, boost::interprocess::iset_index> >::allocator()'
include/boost/interprocess/allocators/allocator.hpp:130: note: candidates are: boost::interprocess::allocator<T, SegmentManager>::allocator(const boost::interprocess::allocator<T, SegmentManager>&) [with T = char, SegmentManager = boost::interprocess::segment_manager<char, boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_family, boost::interprocess::offset_ptr<void>, 0ul>, boost::interprocess::iset_index>]
include/boost/interprocess/allocators/allocator.hpp:125: note: boost::interprocess::allocator<T, SegmentManager>::allocator(SegmentManager*) [with T = char, SegmentManager = boost::interprocess::segment_manager<char, boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_family, boost::interprocess::offset_ptr<void>, 0ul>, boost::interprocess::iset_index>]
include/boost/multi_index/detail/ord_index_ops.hpp:74: instantiated from 'Node* boost::multi_index::detail::ordered_index_find(Node*, Node*, const KeyFromValue&, const CompatibleKey&, const CompatibleCompare&) [with Node = boost::multi_index::detail::ordered_index_node<boost::multi_index::detail::ordered_index_node<boost::multi_index::detail::index_node_base<tickerUpdateInfo, boost::interprocess::allocator<tickerUpdateInfo, boost::interprocess::segment_manager<char, boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_family, boost::interprocess::offset_ptr<void>, 0ul>, boost::interprocess::iset_index> > > > >, KeyFromValue = boost::multi_index::member<tickerUpdateInfo, boost::container::basic_string<char, std::char_traits<char>, boost::interprocess::allocator<char, boost::interprocess::segment_manager<char, boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_family, boost::interprocess::offset_ptr<void>, 0ul>, boost::interprocess::iset_index> > >, &tickerUpdateInfo::symbol>, CompatibleKey = char [4], CompatibleCompare = std::less<boost::container::basic_string<char, std::char_traits<char>, boost::interprocess::allocator<char, boost::interprocess::segment_manager<char, boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_family, boost::interprocess::offset_ptr<void>, 0ul>, boost::interprocess::iset_index> > > >]'
include/boost/multi_index/ordered_index.hpp:434: instantiated from 'boost::multi_index::detail::bidir_node_iterator<boost::multi_index::detail::ordered_index_node<typename SuperMeta::type::node_type> > boost::multi_index::detail::ordered_index<KeyFromValue, Compare, SuperMeta, TagList, Category>::find(const CompatibleKey&) const [with CompatibleKey = char [4], KeyFromValue = boost::multi_index::member<tickerUpdateInfo, boost::container::basic_string<char, std::char_traits<char>, boost::interprocess::allocator<char, boost::interprocess::segment_manager<char, boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_family, boost::interprocess::offset_ptr<void>, 0ul>, boost::interprocess::iset_index> > >, &tickerUpdateInfo::symbol>, Compare = std::less<boost::container::basic_string<char, std::char_traits<char>, boost::interprocess::allocator<char, boost::interprocess::segment_manager<char, boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_family, boost::interprocess::offset_ptr<void>, 0ul>, boost::interprocess::iset_index> > > >, SuperMeta = boost::multi_index::detail::nth_layer<2, tickerUpdateInfo, boost::multi_index::indexed_by<boost::multi_index::ordered_unique<boost::multi_index::tag<id, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na>, boost::multi_index::member<tickerUpdateInfo, boost::container::basic_string<char, std::char_traits<char>, boost::interprocess::allocator<char, boost::interprocess::segment_manager<char, boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_family, boost::interprocess::offset_ptr<void>, 0ul>, boost::interprocess::iset_index> > >, &tickerUpdateInfo::id>, mpl_::na>, boost::multi_index::ordered_unique<boost::multi_index::tag<symbol, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na>, boost::multi_index::member<tickerUpdateInfo, boost::container::basic_string<char, std::char_traits<char>, boost::interprocess::allocator<char, boost::interprocess::segment_manager<char, boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_family, boost::interprocess::offset_ptr<void>, 0ul>, boost::interprocess::iset_index> > >, &tickerUpdateInfo::symbol>, mpl_::na>, boost::multi_index::ordered_non_unique<boost::multi_index::tag<last_update_time, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na>, boost::multi_index::member<tickerUpdateInfo, int, &tickerUpdateInfo::last_update_time>, mpl_::na>, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na>, boost::interprocess::allocator<tickerUpdateInfo, boost::interprocess::segment_manager<char, boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_family, boost::interprocess::offset_ptr<void>, 0ul>, boost::interprocess::iset_index> > >, TagList = boost::mpl::v_item<symbol, boost::mpl::vector0<mpl_::na>, 0>, Category = boost::multi_index::detail::ordered_unique_tag]'
src/writer.cxx:107: instantiated from here
include/boost/multi_index/detail/ord_index_ops.hpp:74: error: no matching function for call to 'boost::interprocess::allocator<char, boost::interprocess::segment_manager<char, boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_family, boost::interprocess::offset_ptr<void>, 0ul>, boost::interprocess::iset_index> >::allocator()'
include/boost/interprocess/allocators/allocator.hpp:130: note: candidates are: boost::interprocess::allocator<T, SegmentManager>::allocator(const boost::interprocess::allocator<T, SegmentManager>&) [with T = char, SegmentManager = boost::interprocess::segment_manager<char, boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_family, boost::interprocess::offset_ptr<void>, 0ul>, boost::interprocess::iset_index>]
include/boost/interprocess/allocators/allocator.hpp:125: note: boost::interprocess::allocator<T, SegmentManager>::allocator(SegmentManager*) [with T = char, SegmentManager = boost::interprocess::segment_manager<char, boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_family, boost::interprocess::offset_ptr<void>, 0ul>, boost::interprocess::iset_index>]
更新
我已经改变了代码的结构并使用了你所建议的仿函数，我仍然看到问题，我正在粘贴下面的代码片段： //TickerInfoMangerImplementation.cxx
1 #include <TickerInfoMangerImplementation.h>
2 #include <boost/interprocess/managed_shared_memory.hpp>
3 #include <iostream>
4
5 using namespace boost::interprocess;
6
7 tickerInfoMangerImplementation::tickerInfoMangerImplementation( const sharedMemoryNameT & name ): m_name(name),
8 m_managed_memory_segment( create_only, "test", 65536 )
9 {
10
11 p_ticker_info_set = m_managed_memory_segment.construct<ticker_update_info_set>
12 ("SetOfTickerUpdateInformation") //Container's name in shared memory
13 ( ticker_update_info_set::ctor_args_list()
14 , m_managed_memory_segment.get_allocator<tickerUpdateInfoT>()); //Ctor parameters
15 }
16
17 bool tickerInfoMangerImplementation::put_records( const tickerUpdateInfoT & record ) {
18
19 std::pair<ticker_update_info_set::iterator, bool> result_pair = p_ticker_info_set->insert( record );
20 if( result_pair.second ) {
21 return result_pair.second;
22 }
23
24 typedef ticker_update_info_set::index<symbol_index>::type ticker_update_info_set_by_symbol;
25 ticker_update_info_set_by_symbol & sym_index = (*p_ticker_info_set).get<symbol_index>();
26 ticker_update_info_set_by_symbol::iterator it = sym_index.find( record.m_symbol );
27 tickerUpdateInfoT ticker_info = *it;
28 ticker_info.m_last_update_time = record.m_last_update_time;
29 return sym_index.replace( it, ticker_info );
30 }
31
32 int tickerInfoMangerImplementation::get_active_ticker_count( const thresholdT seconds ) {
33 }
34
35 void tickerInfoMangerImplementation::print_contents() {
36 const ticker_update_info_set::nth_index<1>::type& name_index = (*p_ticker_info_set).get<1>();
37 std::copy( name_index.begin(), name_index.end(), std::ostream_iterator<tickerUpdateInfoT>(std::cout) );
38 }
39
40 std::ostream& operator<<(std::ostream& os, const tickerUpdateInfoT & obj) {
41 os << obj.m_id << " ";
42 os << obj.m_symbol << " ";
43 os << obj.m_last_update_time << " " << "\n";
44 return os;
45 };
//TickerInfoMangerImplementation.h
1 #ifndef __TICKER_INFO_MANAGER_IMPL__
2 #define __TICKER_INFO_MANAGER_IMPL__
3
4 #include <boost/interprocess/containers/string.hpp>
5 #include <boost/interprocess/shared_memory_object.hpp>
6 #include <boost/multi_index_container.hpp>
7 #include <boost/multi_index/member.hpp>
8 #include <boost/multi_index/ordered_index.hpp>
9 #include <TickerInfoManagerConstants.h>
10 #include <TickerInfo.h>
11
12 namespace bmi = boost::multi_index;
13 namespace bip = boost::interprocess;
14
15 struct id_index{};
16 struct symbol_index{};
17 struct last_update_time_index{};
18
19 struct Less {
20 template<class T, class U>
21 bool operator()(T const& t, U const& u) const {
22 return t < u;
23 }
24 };
25
25
26
27 typedef bmi::multi_index_container<
28 tickerUpdateInfoT,
29 bmi::indexed_by<
30 bmi::ordered_unique
31 <bmi::tag<id_index>, BOOST_MULTI_INDEX_MEMBER( tickerUpdateInfo, shm_string, m_id), Less>,
32 bmi::ordered_unique<
33 bmi::tag<symbol_index>,BOOST_MULTI_INDEX_MEMBER(tickerUpdateInfo, shm_string, m_symbol), Less>,
34 bmi::ordered_non_unique
35 <bmi::tag<last_update_time_index>, BOOST_MULTI_INDEX_MEMBER(tickerUpdateInfo, int, m_last_update_time), Less> >,
36 bip::managed_shared_memory::allocator<tickerUpdateInfo>::type
37 > ticker_update_info_set;
38
39 class tickerInfoMangerImplementation {
40
41 public:
42 tickerInfoMangerImplementation( const sharedMemoryNameT & name );
43
44 bool put_records( const tickerUpdateInfoT & record );
45
46 int get_active_ticker_count( const thresholdT seconds );
47
48 void print_contents();
49
50 bip::managed_shared_memory& get_managed_memory_segment() {
51 return m_managed_memory_segment;
52 }
53
54 private:
55 const sharedMemoryNameT m_name;
56 bip::managed_shared_memory m_managed_memory_segment;
57 ticker_update_info_set *p_ticker_info_set;
58 };
59 #endif
// TickerInfo.h
1 #ifndef __TICKER_INFO__
2 #define __TICKER_INFO__
3
4 #include <boost/interprocess/managed_shared_memory.hpp>
5 #include <boost/interprocess/allocators/allocator.hpp>
6 #include <boost/interprocess/containers/string.hpp>
7
8 typedef boost::interprocess::managed_shared_memory::allocator<char>::type char_allocator;
9 typedef boost::interprocess::basic_string<char, std::char_traits<char>, char_allocator> shm_string;
10
11 //Data to insert in shared memory
12 typedef struct tickerUpdateInfo{
13
14 shm_string m_id;
15 shm_string m_symbol;
16 int m_last_update_time;
17
18 tickerUpdateInfo( const char * id,
19 const char *symbol,
20 int last_update_time,
21 const char_allocator &a)
22 : m_id( id, a), m_symbol( symbol, a), m_last_update_time( last_update_time) {
23 }
24 } tickerUpdateInfoT;
25
错误日志：
tor0,0＆gt;，Category = boost :: multi_index :: detail :: ordered_unique_tag]＆＃39; /home/user/droy/src/quotes/debshmutils/shmdb/src/TickerInfoMangerImplementation.cxx:29：从这里实例化 /home/dev/build/third_party/64-rhel5/boost_1_47_0/include/boost/multi_index/detail/index_base.hpp:114：错误：不匹配＆＃39;运营商=＆＃39; in＆＃39; x-＆gt; boost :: multi_index :: detail :: index_node_base :: value with Value = tickerUpdateInfo，Allocator = boost :: interprocess :: allocator，0ul＆gt;，boost :: interprocess :: iset_index＆gt; ＆GT; = v＆＃39; include / TickerInfo.h：12：注意：候选人是：tickerUpdateInfo＆amp; tickerUpdateInfo ::运算=（tickerUpdateInfo＆安培;）
请关注我，因为我不清楚这里发生了什么。谢谢！
答案 0 :(得分：1)
问题是ordered_unique / ordered_non_unique索引默认使用std::less<K>。当您使用兼容密钥nm_index.find("Joe")，char const[]＆＃34; Joe＆＃34;进行搜索时需要在shm_string中转换为std::less<K>::operator()(shm_string const&, shm_string const&)，但shm_string构造函数还需要一个allocator参数。
解决方案是提供自己的不转换参数的比较类：
struct Less
{
template<class T, class U>
bool operator()(T const& t, U const& u) const {
return t < u;
}
};
// Define a multi_index_container of tickerUpdateInfos with following indices:
// - a unique index sorted by tickerUpdateInfo::id,
// - a unique index sorted by tickerUpdateInfo::symbol,
// - a non-unique index sorted by tickerUpdateInfo::last_update_time.
typedef bmi::multi_index_container<
tickerUpdateInfo,
bmi::indexed_by<
bmi::ordered_unique<bmi::tag<id>, BOOST_MULTI_INDEX_MEMBER( tickerUpdateInfo, shm_string, id), Less>,
bmi::ordered_unique<bmi::tag<symbol>,BOOST_MULTI_INDEX_MEMBER(tickerUpdateInfo, shm_string, symbol), Less>,
bmi::ordered_non_unique<bmi::tag<last_update_time>, BOOST_MULTI_INDEX_MEMBER(tickerUpdateInfo, int, last_update_time), Less>
>,
managed_shared_memory::allocator<tickerUpdateInfo>::type
> tickerUpdateInfo_set;
tickerUpdateInfo& operator=(const tickerUpdateInfo& other)不是必需的，编译器生成的一个做同样的事情。