如何防止Boost.进程间使用wchar

How do I prevent Boost.Interprocess from using wchar?

本文关键字：wchar 进程 何防止 Boost      更新时间：2023-10-16

我正试图交叉编译一些Boost进程间代码到一个没有实现wcslen和wmemset等wchar函数的环境。

下面是我的代码:

#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;
}

包含L"MyList"的调用会在boost/interprocess/segment_manager.cpp中触发一个调用:

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

它试图调用libcxx/string中的wcslen，这是我想避免的。

我尝试从缓冲区名称中删除'L'，但随后它抱怨参数不是wchar。任何关于如何删除这个wchar依赖的指导都非常感谢-不幸的是，我设置的宏似乎没有做到这一点。

我正在使用最新的Boost头(不是我的系统上的)

马科斯

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>的类型定义一样。

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

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