Question

我正在使用boost 1.53和GCC 4.1.2。我曾尝试在某些测试中使用boost unordered_map（文档说，它应该与共享内存一起使用），但我无法编译我的代码。使用interprocess::map代替无序，一切正常。

类型定义：

typedef boost::interprocess::allocator<char, SegmentManager> CharAllocator;
typedef boost::interprocess::basic_string<char, std::char_traits<char>, CharAllocator> ShmString;
typedef ShmString  HashKeyType;
//ComplexType is a wrapper for internal interprocess::map
typedef ComplexType  HashMappedType;
typedef std::pair<const ShmString, ComplexType> HashValueType;

typedef boost::interprocess::allocator<HashValueType,
  boost::interprocess::managed_shared_memory::segment_manager> HashMemAllocator;

typedef boost::unordered_map
  < HashKeyType           , HashMappedType
  , boost::hash<HashKeyType>  ,std::equal_to<HashKeyType>
  , HashMemAllocator>
TestHashMap;

分配：

boost::interprocess::managed_shared_memory segment( boost::interprocess::open_or_create, "MySharedMemory", 65536);
thm_ = segment.construct<TestHashMap>("TestHashMap")
      (3, boost::hash<ShmString>(), std::equal_to<ShmString>()
      , segment.get_allocator<HashValueType>());

用法：

boost::interprocess::managed_shared_memory segment( boost::interprocess::open_only, "MySharedMemory");
ShmString str("123.345", segment.get_allocator<ShmString>());

ComplexType th("MySharedMemory");

HashValueType value(str, th);
thm_->insert(value);

这是一些错误输出：

../boost/include/boost/unordered/detail/allocate.hpp: In instantiation of 'boost::unordered::detail::allocator_traits<boost::interprocess::allocator<boost::unordered::detail::ptr_node<std::pair<const 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, long int, long unsigned int, 0u>, 0ul>, boost::interprocess::iset_index> > >, TINHolderShared> >, boost::interprocess::segment_manager<char, boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_family, boost::interprocess::offset_ptr<void, long int, long unsigned int, 0u>, 0ul>, boost::interprocess::iset_index> > >::pointer_to_other<const boost::unordered::detail::ptr_node<std::pair<const 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, long int, long unsigned int, 0u>, 0ul>, boost::interprocess::iset_index> > >, TINHolderShared> > >':
../boost/include/boost/unordered/detail/allocate.hpp:527:   instantiated from 'boost::unordered::detail::allocator_traits<boost::interprocess::allocator<boost::unordered::detail::ptr_node<std::pair<const 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, long int, long unsigned int, 0u>, 0ul>, boost::interprocess::iset_index> > >, TINHolderShared> >, boost::interprocess::segment_manager<char, boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_family, boost::interprocess::offset_ptr<void, long int, long unsigned int, 0u>, 0ul>, boost::interprocess::iset_index> > >'
../boost/include/boost/unordered/detail/unique.hpp:114:   instantiated from 'boost::unordered::detail::pick_node<boost::interprocess::allocator<std::pair<const 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, long int, long unsigned int, 0u>, 0ul>, boost::interprocess::iset_index> > >, TINHolderShared>, boost::interprocess::segment_manager<char, boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_family, boost::interprocess::offset_ptr<void, long int, long unsigned int, 0u>, 0ul>, boost::interprocess::iset_index> >, std::pair<const 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, long int, long unsigned int, 0u>, 0ul>, boost::interprocess::iset_index> > >, TINHolderShared> >'
../boost/include/boost/unordered/detail/unique.hpp:158:   instantiated from 'boost::unordered::detail::map<boost::interprocess::allocator<std::pair<const 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, long int, long unsigned int, 0u>, 0ul>, boost::interprocess::iset_index> > >, TINHolderShared>, boost::interprocess::segment_manager<char, boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_family, boost::interprocess::offset_ptr<void, long int, long unsigned int, 0u>, 0ul>, boost::interprocess::iset_index> >, 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, long int, long unsigned int, 0u>, 0ul>, boost::interprocess::iset_index> > >, TINHolderShared, boost::hash<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, long int, long unsigned int, 0u>, 0ul>, boost::interprocess::iset_index> > > >, std::equal_to<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, long int, long unsigned int, 0u>, 0ul>, boost::interprocess::iset_index> > > > >'
../boost/include/boost/unordered/unordered_map.hpp:59:   instantiated from 'boost::unordered::unordered_map<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, long int, long unsigned int, 0u>, 0ul>, boost::interprocess::iset_index> > >, TINHolderShared, boost::hash<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, long int, long unsigned int, 0u>, 0ul>, boost::interprocess::iset_index> > > >, std::equal_to<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, long int, long unsigned int, 0u>, 0ul>, boost::interprocess::iset_index> > > >, boost::interprocess::allocator<std::pair<const 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, long int, long unsigned int, 0u>, 0ul>, boost::interprocess::iset_index> > >, TINHolderShared>, boost::interprocess::segment_manager<char, boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_family, boost::interprocess::offset_ptr<void, long int, long unsigned int, 0u>, 0ul>, boost::interprocess::iset_index> > >'
utest/THUnitTests.cc:96:   instantiated from here
../boost/include/boost/unordered/detail/allocate.hpp:523: error: ambiguous class template instantiation for 'struct boost::pointer_to_other<boost::interprocess::offset_ptr<boost::unordered::detail::ptr_node<std::pair<const 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, long int, long unsigned int, 0u>, 0ul>, boost::interprocess::iset_index> > >, TINHolderShared> >, long int, long unsigned int, 0u>, const boost::unordered::detail::ptr_node<std::pair<const 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, long int, long unsigned int, 0u>, 0ul>, boost::interprocess::iset_index> > >, TINHolderShared> > >'
../boost/include/boost/interprocess/offset_ptr.hpp:721: error: candidates are: struct boost::pointer_to_other<boost::interprocess::offset_ptr<T1, P1, O1, A1>, U>
../boost/include/boost/pointer_to_other.hpp:29: error:                 struct boost::pointer_to_other<Sp<T>, U>
../boost/include/boost/pointer_to_other.hpp:36: error:                 struct boost::pointer_to_other<Sp<T, T2>, U>
../boost/include/boost/pointer_to_other.hpp:43: error:                 struct boost::pointer_to_other<Sp<T, T2, T3>, U>

我不确定问题是在我的代码中，还是因为旧的编译器版本。如果问题出在编译器上，那么可以用更新版本的boost修复吗？（我不能更新我的GCC）。或者也许有一些哈希表的实现，它们与共享内存和我的编译器兼容？

Answer 1

这是一个固定的版本。

我只是根据暗示性评论试图让它自成一体。它有效。

希望它有所帮助：

<强> Live On Coliru

#include <boost/interprocess/managed_shared_memory.hpp>
#include <boost/interprocess/containers/string.hpp>
#include <boost/interprocess/containers/map.hpp>
#include <boost/unordered_map.hpp>

namespace bip = boost::interprocess;
// ShmString is boost::interprocess::basic_string
typedef bip::allocator<char, bip::managed_shared_memory::segment_manager> CharAllocator;
typedef bip::basic_string<char, std::char_traits<char>, CharAllocator> ShmString;
typedef ShmString HashKeyType;
// ComplexType is a wrapper for internal interprocess::map
struct ComplexType {
    typedef bip::allocator<std::pair<int const, int>, bip::managed_shared_memory::segment_manager> Alloc;
    typedef bip::map<int, int, std::less<int>, Alloc> Map;

    template <typename Alloc2>
    ComplexType(std::string, Alloc2 const& alloc = {}) : map(alloc) {}
    Map map;
};

typedef ComplexType HashMappedType;
typedef std::pair<const ShmString, ComplexType> HashValueType;
typedef bip::allocator<HashValueType, bip::managed_shared_memory::segment_manager> HashMemAllocator;
typedef boost::unordered_map<HashKeyType, HashMappedType, boost::hash<HashKeyType>, std::equal_to<HashKeyType>, HashMemAllocator>
    TestHashMap;

int main()
{
    // Allocation:
    {
        bip::managed_shared_memory segment(bip::open_or_create, "MySharedMemory", 65536);
        auto thm_ = segment.construct<TestHashMap>("TestHashMap")(3, boost::hash<ShmString>(), std::equal_to<ShmString>(),
                segment.get_allocator<HashValueType>());

    }
    // Usage:
    bip::managed_shared_memory segment(bip::open_only, "MySharedMemory");
    auto thm_ = segment.construct<TestHashMap>("TestHashMap")(3, boost::hash<ShmString>(), std::equal_to<ShmString>(), segment.get_allocator<HashValueType>());
    ShmString str("123.345", segment.get_allocator<ShmString>());

    ComplexType th("MySharedMemory", segment.get_segment_manager());

    HashValueType value(str, th);
    thm_->insert(value);
}

提升进程间unordered_map编译

1 个答案: