c++ - 如何防止 Boost.Interprocess 使用 wchar？

Question

我正在尝试将一些 Boost Interprocess 代码交叉编译到没有实现 wchar 函数(例如 wcslen 和 wmemset)的环境中。

这是我的代码:

#define BOOST_NO_CWCHAR
#define BOOST_NO_CWCTYPE
#define BOOST_NO_CTYPE_FUNCTIONS
#define BOOST_NO_INTRINSIC_WCHAR_T
#define BOOST_NO_STD_WSTREAMBUF
#define BOOST_NO_STD_WSTRING
#define BOOST_NO_CHAR32_T
#define BOOST_NO_CHAR16_T
#define BOOST_NO_CXX11_CHAR16_T
#define BOOST_NO_CXX11_CHAR32_T
#define BOOST_NO_UNICODE_LITERALS

#define BOOST_DATE_TIME_NO_LIB
#define BOOST_ALL_NO_LIB
//#define BOOST_INTERPROCESS_POSIX_PROCESS_SHARED
//#define BOOST_INTERPROCESS_POSIX_TIMEOUTS
//#define BOOST_DATE_TIME_HAS_HIGH_PRECISION_CLOCK
#define BOOST_HAS_GETTIMEOFDAY
#define CGAL_HAS_NO_THREADS -U__GNUG__
#define BOOST_NO_NATIVE_LONG_DOUBLE_FP_CLASSIFY
#define BOOST_MATH_NO_LONG_DOUBLE_MATH_FUNCTIONS



#include <boost/interprocess/managed_external_buffer.hpp>
#include <boost/interprocess/allocators/allocator.hpp>
#include <boost/interprocess/containers/list.hpp>
#include <cstring>
#include <boost/aligned_storage.hpp>

using namespace boost::interprocess;

//Alias an integer node allocator type
//This allocator will allocate memory inside the static buffer
typedef allocator<int, wmanaged_external_buffer::segment_manager>
   allocator_t;

//Alias a STL compatible list to be constructed in the static buffer
typedef list<int, allocator_t>    MyBufferList;


void processWork(char *data, int size)
{
    const int localSize = 65536;
    static boost::aligned_storage<localSize>::type static_buffer2;
    std::memcpy(&static_buffer2, data, localSize);

    wmanaged_external_buffer objects_in_static_memory2
       (open_only, &static_buffer2, localSize);

    //Check that "MyList" has been duplicated in the second buffer
    MyBufferList *list = objects_in_static_memory2.find<MyBufferList>(L"MyList").first;
    std::cout << list->front();

    **objects_in_static_memory2.destroy<MyBufferList>(L"MyList");**

}

int main()
{
    std::cout << "Starting";

   //Create the static memory who will store all objects
   const int memsize = 65536;

   static boost::aligned_storage<memsize>::type static_buffer;

   //This managed memory will construct objects associated with
   //a wide string in the static buffer
   wmanaged_external_buffer objects_in_static_memory
      (create_only, &static_buffer, memsize);

   //We optimize resources to create 100 named objects in the static buffer
   objects_in_static_memory.reserve_named_objects(100);



   //The list must be initialized with the allocator
   //All objects created with objects_in_static_memory will
   //be stored in the static_buffer!
   MyBufferList *list = objects_in_static_memory.construct<MyBufferList>(L"MyList")
                           (objects_in_static_memory.get_segment_manager());


   list->push_back(624);
   processWork((char*)static_buffer.address(), memsize);
   objects_in_static_memory.destroy<MyBufferList>(L"MyList");

   return 0;
}

其中带有 L"MyList"的调用促成了 boost/interprocess/segment_manager.cpp 中的调用:

 index_it it = index.find(key_type (name, std::char_traits<CharT>::length(name)));

它试图在 libcxx/string 中调用 wcslen，这是我试图避免的。

我尝试从缓冲区名称中删除“L”，但随后它提示参数不是 wchar。非常感谢有关如何删除此 wchar 依赖项的任何指导 - 不幸的是，我设置的宏似乎无法解决问题。

我正在使用最新的 Boost header (不是我系统上的)

马科斯

Answer 1

wmanaged_external_buffer是 basic_managed_external_buffer<wchar_t> 的类型定义, 就像 std::wstring是 std::basic_string<wchar_t> 的类型定义.

你应该使用 managed_external_buffer (或直接 basic_managed_external_buffer<char>)。