将boost :: allocators保持为类成员。可以使用它们来初始化容器

Question

我想放入共享内存c struct，其中包含一个包含wstring的struct向量。所以：

• 我做了两个分配器，一个用于wchar，一个用于struts2。
• 然后定义了我的容器wstring和vector。

我想保持wchar和struct2分配器作为类的成员，这样我就不必保持对shm的引用（因为我不需要每次我想使用shm.get_manager（）创建它们操纵数据）。但无论我使用什么配置，都会失败。

现在，我收到以下错误：

SharedData(InnerDataAllocator eAlloc):data(eAlloc) { 

错误C2664： 'boost :: container :: vector，void> :: vector（const boost :: container :: vector，void>＆）'：无法将参数1从'InnerDataAllocator'转换为'const boost :: container :: new_allocator＆'

header.h

typedef bip::allocator<wchar_t, bip::managed_shared_memory::segment_manager> CharAllocator;
typedef bip::basic_string<wchar_t, std::char_traits<wchar_t>, CharAllocator> MyShmString;

class InnerData {
public:
    uint64_t id;
    MyShmString name;
    uint8_t status;
    static const uint8_t defaultStatus = 3;

    InnerData(CharAllocator cAlloc):name(cAlloc) {

    }
};

typedef bip::allocator<InnerData, bip::managed_shared_memory::segment_manager> InnerDataAllocator;
class SharedData {
public:
    int a;
    bool newRequestUntreated = false;
    bool newReplyUntreated = false;

    bip::vector<InnerData> data; 
    SharedData(InnerDataAllocator eAlloc):data(eAlloc) {

    }
};

UsualInnerData{//like InnerData but with normal std::wstring
public:
    uint64_t id;
    std::wstring name;
    uint8_t status;
    static const uint8_t status Default = 3;
};

class Zone {
public:
    SharedData * sharedData;

    CharAllocator     charAllocator;
    InnerDataAllocator   innerDataAllocator;

    void putInShm(const std::vector<UsualInnerData> &in);
    void initializeZone(std::string &_name, std::string &_nameSeg);
    static bool alreadyCreated;
};

code.cpp

void Zone::createNewCheckingZone(std::string &_name, std::string &_nameSeg) {
    if (!alreadyCreated) {
        int size = getOverallSize();
        bip::managed_shared_memory shm(bip::create_only, _name.c_str(), 10000 + size);
        CharAllocator scharAllocator(shm.get_segment_manager());
        swap(charAllocator, scharAllocator); //use of swap because = operator says Not assignable from other allocator

        InnerDataAllocator sinnerDataAllocator(shm.get_segment_manager());
        swap(innerDataAllocator, sinnerDataAllocator);
        sharedData = shm.construct<SharedData>(_nameSeg)(innerDataAllocator);
        alreadyCreated = true;
    }
    return ;
}
void Zone::putInShm(const std::vector<UsualInnerData> &in){
    InnerData newInnerData(charAllocator);
    for (auto a : in) {
        newInnerData.id = a.id;
        newInnerData.name = a.xml.c_str();
        newInnerData.status = InnerData::defaultStatus;
        sharedData->data.push_back(newInnerData);
    }
    return;
}

我可以毫无困难地使用Zone的charAllocator初始化InnerData.name，为什么我不能这样做，即使用Zone的innerDataAllocator初始化SharedData.data？

Answer 1

实际上，我犯了一个错误，（昨天完成了我的咖啡袋，现在开始感觉到了），我定义了：

typedef  bip::vector<InnerData, InnderDataAllocator> InnerDataVector;

但没有用它来定义SharedData.data。这是我改变它的方式：

class SharedData {
public:
    int a;
    bool newRequestUntreated = false;
    bool newReplyUntreated = false;
    InnerDataVector data; 
    SharedData(InnerDataAllocator eAlloc):data(eAlloc) {}
};

现在它编译。