boost 中的共享内存向量

我有以下代码。尝试拥有一个具有字符串和数组结构的共享内存向量。但是当我编译代码时出现错误：

 usr/local/include/boost/container/vector.hpp:1819:4: error: no matching function for call to ‘InData::InData(InData* const&)’

任何建议如何解决这个问题。我是 Boost 的新手。

#include <iostream>
#include <string>
#include <cstdlib>
#include <boost/interprocess/ipc/message_queue.hpp>
#include <boost/scoped_ptr.hpp>
#include <boost/interprocess/shared_memory_object.hpp>
#include <boost/interprocess/managed_shared_memory.hpp>
#include <boost/interprocess/mapped_region.hpp>
#include <boost/interprocess/allocators/allocator.hpp>
#include <boost/interprocess/containers/string.hpp>
#include <boost/interprocess/containers/vector.hpp>

using namespace boost::interprocess;

typedef boost::interprocess::basic_string<char> shared_string;

    struct InData
    {
        int X,Y,H,W;
        shared_string Label;
    };

    int main()
    {

        shared_memory_object::remove("MySharedMemory");
        managed_shared_memory managed_shm(create_only, "MySharedMemory", 10000);

        InData tData;// = managed_shm.construct<InData>("InDataStructure")();

        tData.Label = "Hello World";
        tData.H = 1;
        tData.W = 1;
        tData.Y = 1;
        tData.X = 1;

        typedef allocator<InData,managed_shared_memory::segment_manager> tStructData;
        typedef vector<InData,tStructData>  MyVector;

        //Initialize shared memory STL-compatible allocator
         tStructData alloc_inst (managed_shm.get_segment_manager());

         //Construct a vector named "MyVector" in shared memory with argument alloc_inst
          MyVector *myvector = managed_shm.construct<MyVector>("MyVector")(alloc_inst);

          //InData data;
          myvector->push_back(&tData);

        return 0;
    }

如果只是做myvector->push_back(tData)

/usr/local/include/boost/container/detail/advanced_insert_int.hpp:166:10: error: no match for ‘operator=’ (operand types are ‘InData’ and ‘const value_type {aka const InData}’)

我已经对我的评论进行了实时编码：录制的会话

修复后的代码如下。一些注释（不过，请观看流媒体会议）：

1. 您未能为“共享”字符串提供分配器。这意味着它使用std::allocator并且分配是从程序堆中完成的。哎呀。如果你幸运的话，你的程序将会死掉。

2. 一旦你给出shared_string正确的分配器，你会发现连锁反应。您需要在构造时传入分配器实例shared_string因为进程间分配器实例是not默认可构造。

   经验法则：有状态分配器是痛苦的。如果你避免痛苦，那么你就做错了（并且从错误的堆中分配）

3. 命名很重要：

   typedef allocator<InData, managed_shared_memory::segment_manager> tStructData;
   

   为什么命名你的分配器类型tStructData？你也可以称之为XXX。所以，将其更改为

   typedef allocator<InData, managed_shared_memory::segment_manager> salloc;
   

   当我试图理解你的代码时，这花了我一段时间......

4. 而不是显式创建alloc_inst，考虑使用隐式转换segment_manager

5. The line

   myvector->push_back(&tData);
   

   试图推动pointer到类对象的向量中。无论您的分配器如何，这永远不会起作用

Live On Coliru

#include <iostream>
#include <string>
#include <boost/interprocess/shared_memory_object.hpp>
#include <boost/interprocess/managed_shared_memory.hpp>
#include <boost/interprocess/allocators/allocator.hpp>
#include <boost/interprocess/containers/string.hpp>
#include <boost/interprocess/containers/vector.hpp>

using namespace boost::interprocess;

struct InData;
typedef allocator<InData, managed_shared_memory::segment_manager> salloc;

typedef boost::interprocess::basic_string<char, std::char_traits<char>, salloc::rebind<char>::other> shared_string;

struct InData {
    int X, Y, H, W;

    InData(salloc alloc) : Label(alloc) {}

    shared_string Label;
};

int main() {

    shared_memory_object::remove("MySharedMemory");
    managed_shared_memory managed_shm(create_only, "MySharedMemory", 10000);

    // Initialize shared memory STL-compatible allocator
    salloc alloc_inst(managed_shm.get_segment_manager());

    InData tData(alloc_inst); // = managed_shm.construct<InData>("InDataStructure")();

    tData.Label = "Hello World";
    tData.H = 1;
    tData.W = 1;
    tData.Y = 1;
    tData.X = 1;

    // Construct a vector named "MyVector" in shared memory with argument alloc_inst
    typedef vector<InData, salloc> MyVector;
    MyVector *myvector = managed_shm.construct<MyVector>("MyVector")(alloc_inst);

    // InData data;
    myvector->push_back(tData);
}