升压进程间flat_map operator []的编译错误 [英] Boost interprocess flat_map operator[] compilation errors
本文介绍了升压进程间flat_map operator []的编译错误的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我要建一些包装过的boost ::进程间:: flat_map，问题是，我无法用运算符[] 或在出于某种原因。当我使用找到或插入它编译成功地
的typedef的boost ::进程间:: managed_shared_memory :: segment_manager SegmentManager;
TYPEDEF的boost ::进程间::分配器＆LT;焦炭，SegmentManager＆GT; CharAllocator;
TYPEDEF的boost ::进程间:: basic_string的＆LT;焦炭，的std :: char_traits＆LT;焦炭＆gt;中
CharAllocator＆GT; ShmString;
的typedef短关键字类型;
的typedef ShmString MappedType;
的typedef的std ::对＆LT;常量短，ShmString＆GT;值类型;TYPEDEF的boost ::进程间::分配器＆LT;值类型，
提高::进程间:: managed_shared_memory :: segment_manager＆GT; ShMemAlloc;
TYPEDEF的boost ::进程间:: flat_map＆LT;关键字类型，MappedType，
的std ::以下＆LT;短＆gt;中ShMemAlloc＆GT; ShMap;
类包装{上市： 包装（升压::进程间:: managed_shared_memory * memSeg）：
m_memSeg（memSeg）{
常量ShMemAlloc initAlloc（m_memSeg-＆GT; get_segment_manager（））;
m_storage = m_memSeg-＆GT;构建
＆LT; ShMap＆GT; （::提高::进程间anonymous_instance）
（性病::少＆LT;＆关键字类型GT;（），initAlloc）;
ShmString STR（initAlloc）;
值类型VAL（10，STR）; m_storage-＆GT;插入（VAL）; //好 ShMap：迭代它= m_storage-＆GT;找到（5）; //好
如果（它= m_storage-＆GT;！结束（））
IT-＆gt;第二个= str中; （* m_storage）[5] =海峡; //编译错误
};
〜包装（）;保护：
提高::进程间:: managed_shared_memory * m_memSeg; ShMap * m_storage;
};
这似乎就像有一个与在运算符[] 调用内部分配器类型演绎出了问题，但我不知道如何正确使用它。
下面是错误报告：
../升压/有/升压/集装箱/ string.hpp：在实例'boost::container::container_detail::basic_string_base<Allocator>::members_holder::members_holder() [与分配器=的boost ::进程间::分配器＆LT;焦炭，升压::进程间:: segment_manager＆LT;焦炭，提高::进程间:: rbtree_best_fit＆LT;的boost ::进程间:: mutex_family＆gt;中的boost ::进程间:: iset_index＆GT; ＆GT;]'：
../boost/include/boost/container/string.hpp:104:18：;分配器＆GT;从'的boost ::容器:: container_detail :: basic_string_base＆LT所需:: basic_string_base（）与分配器=的boost ::进程间::分配器＆LT;焦炭，升压::进程间:: segment_manager＆LT;焦炭，提高::进程间:: rbtree_best_fit＆LT;的boost ::进程间:: mutex_family＆gt;中的boost ::进程间:: iset_index＆GT; ＆GT;]
../boost/include/boost/container/string.hpp:596:16：从促进容器:: basic_string的:: LT和要求，图表，性状，分配器＆GT; :: basic_string的（）[带有图表=字符;性状=的std :: char_traits＆LT;焦炭取代;分配器=的boost ::进程间::分配器＆LT;焦炭，升压::进程间:: segment_manager＆LT;焦炭，提高::进程间:: rbtree_best_fit＆LT;的boost ::进程间:: mutex_family＆gt;中的boost ::进程间:: iset_index＆GT; ＆GT;]
../boost/include/boost/container/detail/value_init.hpp:31:13：; T＆GT; :: value_init（）与T =的boost ::容器从的boost ::容器:: container_detail :: value_init＆LT需要:: basic_string的＆LT;焦炭，的std :: char_traits＆LT;焦炭＆gt;中的boost ::进程间::分配器＆LT;焦炭，提高::进程间:: segment_manager＆LT;焦炭，提高::进程间:: rbtree_best_fit＆LT;的boost ::进程间:: mutex_family＆GT; ，提高::进程间:: iset_index＆GT; ＆GT; ＆GT;]
../boost/include/boost/container/flat_map.hpp:846:52：从'的boost ::容器:: flat_map＆LT需要;关键，T，比较，分配器＆GT; :: mapped_type＆安培;提高::容器:: flat_map＆LT;关键，T，比较，分配器＆GT; :: priv_subscript（常量为key_type＆安培;）与主要=短整型; T =的boost ::容器:: basic_string的＆LT;焦炭，的std :: char_traits＆LT;焦炭＆gt;中的boost ::进程间::分配器＆LT;焦炭，提高::进程间:: segment_manager＆LT;焦炭，提高::进程间:: rbtree_best_fit＆LT;提升： ：进程间:: mutex_family＆gt;中的boost ::进程间:: iset_index＆GT; ＆GT;取代;比较=的std ::以下＆LT;短整型取代;分配器=的boost ::进程间::分配器＆LT;的std ::对＆LT;常量短整型，提振::容器:: basic_string的＆LT;焦炭，的std :: char_traits＆LT;焦炭＆gt;中的boost ::进程间::分配器＆LT;焦炭，提振:: ::间和segment_manager LT;焦炭，提高::进程间:: rbtree_best_fit＆LT;的boost ::进程间:: mutex_family＆gt;中的boost ::进程间:: iset_index＆GT; ＆GT; ＆GT; ＆gt;中的boost ::进程间:: segment_manager＆LT;焦炭，升压::进程间:: rbtree_best_fit＆LT;的boost ::进程间:: mutex_family＆gt;中的boost ::进程间:: iset_index＆GT;取代;提高::容器:: flat_map＆LT;关键，T，比较，分配器＆GT; :: mapped_type =提振::容器:: basic_string的＆LT;焦炭，的std :: char_traits＆LT;焦炭＆gt;中的boost ::进程间::分配器＆LT;焦炭，升压： ：进程间:: segment_manager＆LT;焦炭，升压::进程间:: rbtree_best_fit＆LT;的boost ::进程间:: mutex_family＆gt;中的boost ::进程间:: iset_index＆GT; ＆GT;取代;提高::容器:: flat_map＆LT;关键，T，比较，分配器＆GT; ::为key_type =短整型]
../boost/include/boost/container/flat_map.hpp:469:4：！从'typename的提升需要:: enable_if_c≤（（（::提振＆is_class LT; BOOST_MOVE_TEMPL_PARAM＆GT; ::值）||（升压:: move_detail :: is_rv＆LT; BOOST_MOVE_TEMPL_PARAM＆GT; ::值））及及（升压:: is_same＆LT;！关键，BOOST_MOVE_TEMPL_PARAM＆GT; ::值）），T＆安培;＆GT; ::类型boost ::容器:: flat_map＆LT;关键， T，比较，分配器＆GT; ::运算符[]（常量BOOST_MOVE_TEMPL_PARAM＆安培;）与BOOST_MOVE_TEMPL_PARAM = INT;重点=短整型; T =的boost ::容器:: basic_string的＆LT;焦炭，的std :: char_traits＆LT;焦炭＆gt;中的boost ::进程间::分配器＆LT;焦炭，提高::进程间:: segment_manager＆LT;焦炭，提高::进程间:: rbtree_best_fit＆LT;提升： ：进程间:: mutex_family＆gt;中的boost ::进程间:: iset_index＆GT; ＆GT;取代;比较=的std ::以下＆LT;短整型取代;分配器=的boost ::进程间::分配器＆LT;的std ::对＆LT;常量短整型，提振::容器:: basic_string的＆LT;焦炭，的std :: char_traits＆LT;焦炭＆gt;中的boost ::进程间::分配器＆LT;焦炭，提振:: ::间和segment_manager LT;焦炭，提高::进程间:: rbtree_best_fit＆LT;的boost ::进程间:: mutex_family＆gt;中的boost ::进程间:: iset_index＆GT; ＆GT; ＆GT; ＆gt;中的boost ::进程间:: segment_manager＆LT;焦炭，升压::进程间:: rbtree_best_fit＆LT;的boost ::进程间:: mutex_family＆gt;中的boost ::进程间:: iset_index＆GT;取代; TYPENAME的boost :: enable_if_c≤（（（提高:: is_class＆LT;！BOOST_MOVE_TEMPL_PARAM＆GT;！::值）||（升压:: move_detail :: is_rv＆LT; BOOST_MOVE_TEMPL_PARAM＆GT; ::值））及和放大器;！（提高:: is_same＆LT ;关键，BOOST_MOVE_TEMPL_PARAM＆GT; ::值）），T＆安培;＆GT; ::类型=提振::容器:: basic_string的＆LT;焦炭，的std :: char_traits＆LT;焦炭＆gt;中的boost ::进程间::分配器＆LT;焦炭，提振:: ::间和segment_manager LT;焦炭，提高::进程间:: rbtree_best_fit＆LT;的boost ::进程间:: mutex_family＆gt;中的boost ::进程间:: iset_index＆GT; ＆GT; ＆GT;＆安培]
./include/.h:240:23：从这里需要
../boost/include/boost/container/string.hpp:218:22：错误：调用'的boost ::进程间::分配器＆LT没有匹配功能;焦炭，升压::进程间:: segment_manager＆LT;焦炭，升压： ：进程间:: rbtree_best_fit＆LT;的boost ::进程间:: mutex_family＆gt;中的boost ::进程间:: iset_index＆GT; ＆GT; ::分配器（）
../boost/include/boost/container/string.hpp：在实例'boost::container::container_detail::basic_string_base<Allocator>::members_holder::members_holder() [与分配器=的boost ::进程间::分配器＆LT;焦炭，升压::进程间:: segment_manager＆LT;焦炭，提高::进程间:: rbtree_best_fit＆LT;的boost ::进程间:: mutex_family＆gt;中的boost ::进程间:: iset_index＆GT; ＆GT;]'：
../boost/include/boost/container/string.hpp:104:18：;分配器＆GT;从'的boost ::容器:: container_detail :: basic_string_base＆LT所需:: basic_string_base（）与分配器=的boost ::进程间::分配器＆LT;焦炭，升压::进程间:: segment_manager＆LT;焦炭，提高::进程间:: rbtree_best_fit＆LT;的boost ::进程间:: mutex_family＆gt;中的boost ::进程间:: iset_index＆GT; ＆GT;]
../boost/include/boost/container/string.hpp:596:16：从促进容器:: basic_string的:: LT和要求，图表，性状，分配器＆GT; :: basic_string的（）[带有图表=字符;性状=的std :: char_traits＆LT;焦炭取代;分配器=的boost ::进程间::分配器＆LT;焦炭，升压::进程间:: segment_manager＆LT;焦炭，提高::进程间:: rbtree_best_fit＆LT;的boost ::进程间:: mutex_family＆gt;中的boost ::进程间:: iset_index＆GT; ＆GT;]
../boost/include/boost/container/detail/value_init.hpp:31:13：; T＆GT; :: value_init（）与T =的boost ::容器从的boost ::容器:: container_detail :: value_init＆LT需要:: basic_string的＆LT;焦炭，的std :: char_traits＆LT;焦炭＆gt;中的boost ::进程间::分配器＆LT;焦炭，提高::进程间:: segment_manager＆LT;焦炭，提高::进程间:: rbtree_best_fit＆LT;的boost ::进程间:: mutex_family＆GT; ，提高::进程间:: iset_index＆GT; ＆GT; ＆GT;]
../boost/include/boost/container/flat_map.hpp:846:52：从'的boost ::容器:: flat_map＆LT需要;关键，T，比较，分配器＆GT; :: mapped_type＆安培;提高::容器:: flat_map＆LT;关键，T，比较，分配器＆GT; :: priv_subscript（常量为key_type＆安培;）与主要=短整型; T =的boost ::容器:: basic_string的＆LT;焦炭，的std :: char_traits＆LT;焦炭＆gt;中的boost ::进程间::分配器＆LT;焦炭，提高::进程间:: segment_manager＆LT;焦炭，提高::进程间:: rbtree_best_fit＆LT;提升： ：进程间:: mutex_family＆gt;中的boost ::进程间:: iset_index＆GT; ＆GT;取代;比较=的std ::以下＆LT;短整型取代;分配器=的boost ::进程间::分配器＆LT;的std ::对＆LT;常量短整型，提振::容器:: basic_string的＆LT;焦炭，的std :: char_traits＆LT;焦炭＆gt;中的boost ::进程间::分配器＆LT;焦炭，提振:: ::间和segment_manager LT;焦炭，提高::进程间:: rbtree_best_fit＆LT;的boost ::进程间:: mutex_family＆gt;中的boost ::进程间:: iset_index＆GT; ＆GT; ＆GT; ＆gt;中的boost ::进程间:: segment_manager＆LT;焦炭，升压::进程间:: rbtree_best_fit＆LT;的boost ::进程间:: mutex_family＆gt;中的boost ::进程间:: iset_index＆GT;取代;提高::容器:: flat_map＆LT;关键，T，比较，分配器＆GT; :: mapped_type =提振::容器:: basic_string的＆LT;焦炭，的std :: char_traits＆LT;焦炭＆gt;中的boost ::进程间::分配器＆LT;焦炭，升压： ：进程间:: segment_manager＆LT;焦炭，升压::进程间:: rbtree_best_fit＆LT;的boost ::进程间:: mutex_family＆gt;中的boost ::进程间:: iset_index＆GT; ＆GT;取代;提高::容器:: flat_map＆LT;关键，T，比较，分配器＆GT; ::为key_type =短整型]
../boost/include/boost/container/flat_map.hpp:469:4：！从'typename的提升需要:: enable_if_c≤（（（::提振＆is_class LT; BOOST_MOVE_TEMPL_PARAM＆GT; ::值）||（升压:: move_detail :: is_rv＆LT; BOOST_MOVE_TEMPL_PARAM＆GT; ::值））及及（升压:: is_same＆LT;！关键，BOOST_MOVE_TEMPL_PARAM＆GT; ::值）），T＆安培;＆GT; ::类型boost ::容器:: flat_map＆LT;关键， T，比较，分配器＆GT; ::运算符[]（常量BOOST_MOVE_TEMPL_PARAM＆安培;）与BOOST_MOVE_TEMPL_PARAM = INT;重点=短整型; T =的boost ::容器:: basic_string的＆LT;焦炭，的std :: char_traits＆LT;焦炭＆gt;中的boost ::进程间::分配器＆LT;焦炭，提高::进程间:: segment_manager＆LT;焦炭，提高::进程间:: rbtree_best_fit＆LT;提升： ：进程间:: mutex_family＆gt;中的boost ::进程间:: iset_index＆GT; ＆GT;取代;比较=的std ::以下＆LT;短整型取代;分配器=的boost ::进程间::分配器＆LT;的std ::对＆LT;常量短整型，提振::容器:: basic_string的＆LT;焦炭，的std :: char_traits＆LT;焦炭＆gt;中的boost ::进程间::分配器＆LT;焦炭，提振:: ::间和segment_manager LT;焦炭，提高::进程间:: rbtree_best_fit＆LT;的boost ::进程间:: mutex_family＆gt;中的boost ::进程间:: iset_index＆GT; ＆GT; ＆GT; ＆gt;中的boost ::进程间:: segment_manager＆LT;焦炭，升压::进程间:: rbtree_best_fit＆LT;的boost ::进程间:: mutex_family＆gt;中的boost ::进程间:: iset_index＆GT;取代; TYPENAME的boost :: enable_if_c≤（（（提高:: is_class＆LT;！BOOST_MOVE_TEMPL_PARAM＆GT;！::值）||（升压:: move_detail :: is_rv＆LT; BOOST_MOVE_TEMPL_PARAM＆GT; ::值））及和放大器;！（提高:: is_same＆LT ;关键，BOOST_MOVE_TEMPL_PARAM＆GT; ::值）），T＆安培;＆GT; ::类型=提振::容器:: basic_string的＆LT;焦炭，的std :: char_traits＆LT;焦炭＆gt;中的boost ::进程间::分配器＆LT;焦炭，提振:: ::间和segment_manager LT;焦炭，提高::进程间:: rbtree_best_fit＆LT;的boost ::进程间:: mutex_family＆gt;中的boost ::进程间:: iset_index＆GT; ＆GT; ＆GT;＆安培]
./include/.h:240:23：从这里需要
../boost/include/boost/container/string.hpp:218:22：错误：调用'的boost ::进程间::分配器＆LT没有匹配功能;焦炭，升压::进程间:: segment_manager＆LT;焦炭，升压： ：进程间:: rbtree_best_fit＆LT;的boost ::进程间:: mutex_family＆gt;中的boost ::进程间:: iset_index＆GT; ＆GT; ::分配器（）
解决方案
这花了一些挖掘。你的问题是， flat_map ::运算符[] 要求映射类型 T 是默认施工的，因为如果对象不存在需要能够在该位置插入一个缺省对象
您 ShmString 是的不的默认施工的，因为它没有一个默认施工的分配器（它使用共享内存分配器）。
如此看来，你的情况，你将无法使用运算符[] 并有能力使用其他方法，如插入，找到等
I'm building some wrapper over the boost::interprocess::flat_map, the problem is, that i'm unable to use operator[] or at for some reason. When i'm using find or insert it compiles succesfully.
typedef boost::interprocess::managed_shared_memory::segment_manager SegmentManager;
typedef boost::interprocess::allocator<char, SegmentManager> CharAllocator;
typedef boost::interprocess::basic_string<char, std::char_traits<char>,
CharAllocator> ShmString;
typedef short KeyType;
typedef ShmString MappedType;
typedef std::pair<const short, ShmString> ValueType;
typedef boost::interprocess::allocator<ValueType,
boost::interprocess::managed_shared_memory::segment_manager> ShMemAlloc;
typedef boost::interprocess::flat_map<KeyType, MappedType,
std::less<short>, ShMemAlloc> ShMap;
class Wrapper {
public:
Wrapper(boost::interprocess::managed_shared_memory* memSeg) :
m_memSeg(memSeg) {
const ShMemAlloc initAlloc(m_memSeg->get_segment_manager());
m_storage = m_memSeg->construct
<ShMap> (boost::interprocess::anonymous_instance)
(std::less<KeyType>(), initAlloc);
ShmString str(initAlloc);
ValueType val(10, str);
m_storage->insert(val); //Ok
ShMap::iterator it = m_storage->find(5); //Ok
if(it != m_storage->end())
it->second = str;
(*m_storage)[5] = str; //Compilation error
};
~Wrapper();
protected:
boost::interprocess::managed_shared_memory* m_memSeg;
ShMap* m_storage;
};
It seem's like there is a problem with type deduction in allocator inside the operator[] call, but i have no idea how to use it correctly.
Here is the error report:
../boost/include/boost/container/string.hpp: In instantiation of 'boost::container::container_detail::basic_string_base<Allocator>::members_holder::members_holder() [with Allocator = boost::interprocess::allocator<char, boost::interprocess::segment_manager<char, boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_family>, boost::interprocess::iset_index> >]':
../boost/include/boost/container/string.hpp:104:18: required from 'boost::container::container_detail::basic_string_base<Allocator>::basic_string_base() [with Allocator = boost::interprocess::allocator<char, boost::interprocess::segment_manager<char, boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_family>, boost::interprocess::iset_index> >]'
../boost/include/boost/container/string.hpp:596:16: required from 'boost::container::basic_string<CharT, Traits, Allocator>::basic_string() [with CharT = char; Traits = std::char_traits<char>; Allocator = boost::interprocess::allocator<char, boost::interprocess::segment_manager<char, boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_family>, boost::interprocess::iset_index> >]'
../boost/include/boost/container/detail/value_init.hpp:31:13: required from 'boost::container::container_detail::value_init<T>::value_init() [with T = 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::iset_index> > >]'
../boost/include/boost/container/flat_map.hpp:846:52: required from 'boost::container::flat_map<Key, T, Compare, Allocator>::mapped_type& boost::container::flat_map<Key, T, Compare, Allocator>::priv_subscript(const key_type&) [with Key = short int; T = 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::iset_index> > >; Compare = std::less<short int>; Allocator = boost::interprocess::allocator<std::pair<const short int, 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::iset_index> > > >, boost::interprocess::segment_manager<char, boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_family>, boost::interprocess::iset_index> >; boost::container::flat_map<Key, T, Compare, Allocator>::mapped_type = 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::iset_index> > >; boost::container::flat_map<Key, T, Compare, Allocator>::key_type = short int]'
../boost/include/boost/container/flat_map.hpp:469:4: required from 'typename boost::enable_if_c<(((! boost::is_class<BOOST_MOVE_TEMPL_PARAM>::value) || (! boost::move_detail::is_rv<BOOST_MOVE_TEMPL_PARAM>::value)) && (! boost::is_same<Key, BOOST_MOVE_TEMPL_PARAM>::value)), T&>::type boost::container::flat_map<Key, T, Compare, Allocator>::operator[](const BOOST_MOVE_TEMPL_PARAM&) [with BOOST_MOVE_TEMPL_PARAM = int; Key = short int; T = 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::iset_index> > >; Compare = std::less<short int>; Allocator = boost::interprocess::allocator<std::pair<const short int, 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::iset_index> > > >, boost::interprocess::segment_manager<char, boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_family>, boost::interprocess::iset_index> >; typename boost::enable_if_c<(((! boost::is_class<BOOST_MOVE_TEMPL_PARAM>::value) || (! boost::move_detail::is_rv<BOOST_MOVE_TEMPL_PARAM>::value)) && (! boost::is_same<Key, BOOST_MOVE_TEMPL_PARAM>::value)), T&>::type = 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::iset_index> > >&]'
./include/.h:240:23: required from here
../boost/include/boost/container/string.hpp:218:22: 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::iset_index> >::allocator()'
../boost/include/boost/container/string.hpp: In instantiation of 'boost::container::container_detail::basic_string_base<Allocator>::members_holder::members_holder() [with Allocator = boost::interprocess::allocator<char, boost::interprocess::segment_manager<char, boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_family>, boost::interprocess::iset_index> >]':
../boost/include/boost/container/string.hpp:104:18: required from 'boost::container::container_detail::basic_string_base<Allocator>::basic_string_base() [with Allocator = boost::interprocess::allocator<char, boost::interprocess::segment_manager<char, boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_family>, boost::interprocess::iset_index> >]'
../boost/include/boost/container/string.hpp:596:16: required from 'boost::container::basic_string<CharT, Traits, Allocator>::basic_string() [with CharT = char; Traits = std::char_traits<char>; Allocator = boost::interprocess::allocator<char, boost::interprocess::segment_manager<char, boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_family>, boost::interprocess::iset_index> >]'
../boost/include/boost/container/detail/value_init.hpp:31:13: required from 'boost::container::container_detail::value_init<T>::value_init() [with T = 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::iset_index> > >]'
../boost/include/boost/container/flat_map.hpp:846:52: required from 'boost::container::flat_map<Key, T, Compare, Allocator>::mapped_type& boost::container::flat_map<Key, T, Compare, Allocator>::priv_subscript(const key_type&) [with Key = short int; T = 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::iset_index> > >; Compare = std::less<short int>; Allocator = boost::interprocess::allocator<std::pair<const short int, 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::iset_index> > > >, boost::interprocess::segment_manager<char, boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_family>, boost::interprocess::iset_index> >; boost::container::flat_map<Key, T, Compare, Allocator>::mapped_type = 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::iset_index> > >; boost::container::flat_map<Key, T, Compare, Allocator>::key_type = short int]'
../boost/include/boost/container/flat_map.hpp:469:4: required from 'typename boost::enable_if_c<(((! boost::is_class<BOOST_MOVE_TEMPL_PARAM>::value) || (! boost::move_detail::is_rv<BOOST_MOVE_TEMPL_PARAM>::value)) && (! boost::is_same<Key, BOOST_MOVE_TEMPL_PARAM>::value)), T&>::type boost::container::flat_map<Key, T, Compare, Allocator>::operator[](const BOOST_MOVE_TEMPL_PARAM&) [with BOOST_MOVE_TEMPL_PARAM = int; Key = short int; T = 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::iset_index> > >; Compare = std::less<short int>; Allocator = boost::interprocess::allocator<std::pair<const short int, 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::iset_index> > > >, boost::interprocess::segment_manager<char, boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_family>, boost::interprocess::iset_index> >; typename boost::enable_if_c<(((! boost::is_class<BOOST_MOVE_TEMPL_PARAM>::value) || (! boost::move_detail::is_rv<BOOST_MOVE_TEMPL_PARAM>::value)) && (! boost::is_same<Key, BOOST_MOVE_TEMPL_PARAM>::value)), T&>::type = 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::iset_index> > >&]'
./include/.h:240:23: required from here
../boost/include/boost/container/string.hpp:218:22: 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::iset_index> >::allocator()'
解决方案
This took some digging. Your problem is that flat_map::operator[] requires the mapped type T to be default constructable because if the object does not exist it needs to be able to insert a default object at that location.
Your ShmString is not default constructable because it doesn't have a default constructable allocator (it has to use the shared memory allocator).
Thus it appears that in your case you will be unable to make use of operator[] and have to use other methods like insert, find, etc.
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