[Boost-users] How to convert std::string into basic_string

Subject: [Boost-users] How to convert std::string into basic_string
From: manish4gupta (manish_at_[hidden])
Date: 2009-09-14 22:40:12

#include <boost/interprocess/managed_shared_memory.hpp>
#include <boost/interprocess/allocators/allocator.hpp>
#include <boost/interprocess/containers/map.hpp>

How to convert std::string into boost string. I am doing some benchmarking
by inserting the std::string value instead of char_string(ypedef of
basic_string) but i am getting error message.  

#include <boost/interprocess/containers/vector.hpp>
#include <boost/interprocess/containers/string.hpp>
#include <iostream>

using namespace boost::interprocess;

//Typedefs of allocators and containers
typedef managed_shared_memory::segment_manager                      
segment_manager_t;
typedef allocator<void, segment_manager_t>                          
void_allocator;
typedef allocator<int, segment_manager_t>                           
int_allocator;
typedef vector<int, int_allocator>                                  
int_vector;
typedef allocator<int_vector, segment_manager_t>                    
int_vector_allocator;
typedef vector<int_vector, int_vector_allocator>                    
int_vector_vector;
typedef allocator<char, segment_manager_t>                          
char_allocator;
typedef basic_string<char, std::char_traits<char>, char_allocator>  
char_string;

class complex_data
{
   int               id_;
   char_string       char_string_;
   int_vector_vector int_vector_vector_;

   public:
   //Since void_allocator is convertible to any other allocator<T>, we can
simplify
   //the initialization taking just one allocator for all inner containers.
   complex_data(int id, const char *name, const void_allocator &void_alloc)
      : id_(id), char_string_(name, void_alloc),
int_vector_vector_(void_alloc)
   {}
   //Other members...
};

//Definition of the map holding a string as key and complex_data as mapped
type
typedef std::pair<const char_string, int>                     
map_value_type;
typedef std::pair<char_string, int>                           
movable_to_map_value_type;
typedef allocator<map_value_type, segment_manager_t>                   
map_value_type_allocator;
typedef map< char_string, int
           , std::less<char_string>, map_value_type_allocator>         
complex_map_type;

int main ()
{
   //Remove shared memory on construction and destruction
   struct shm_remove
   {
      shm_remove() { shared_memory_object::remove("MySharedMemory"); }
      ~shm_remove(){ shared_memory_object::remove("MySharedMemory"); }
   } remover;

   //Create shared memory
   managed_shared_memory segment(create_only,"MySharedMemory", 65536);

   //An allocator convertible to any allocator<T, segment_manager_t> type
   void_allocator alloc_inst (segment.get_segment_manager());

   //Construct the shared memory map and fill it
   complex_map_type *mymap = segment.construct<complex_map_type>
      //(object name), (first ctor parameter, second ctor parameter)
         ("MyMap")(std::less<char_string>(), alloc_inst);
string s = "hello";
   char y = (char_string)s;
 
   for(int i = 0; i < 100; ++i)
   {
      char_string  key_object(alloc_inst);
      map_value_type value(key_object, i);
      mymap->insert(value);
   }
   return 0;
}

 error: no matching function for call to
‘boost::interprocess_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>, 0u>, boost::interprocess::iset_index>
> >::basic_string(boost::interprocess_container::string&)’
/usr/include/boost/interprocess/containers/container/string.hpp:591: note:
candidates are: boost::interprocess_container::basic_string<CharT, Traits,
Alloc>::basic_string(typename A::size_type, CharT, const A&) [with CharT =
char, Traits = std::char_traits<char>, A =
boost::interprocess::allocator<char,
boost::interprocess::segment_manager<char,
boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_family,
boost::interprocess::offset_ptr<void>, 0u>, boost::interprocess::iset_index>
>]
/usr/include/boost/interprocess/containers/container/string.hpp:584: note:                
boost::interprocess_container::basic_string<CharT, Traits,
Alloc>::basic_string(const CharT*, const A&) [with CharT = char, Traits =
std::char_traits<char>, A = boost::interprocess::allocator<char,
boost::interprocess::segment_manager<char,
boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_family,
boost::interprocess::offset_ptr<void>, 0u>, boost::interprocess::iset_index>
>]
/usr/include/boost/interprocess/containers/container/string.hpp:577: note:                
boost::interprocess_container::basic_string<CharT, Traits,
Alloc>::basic_string(const CharT*, typename A::size_type, const A&) [with
CharT = char, Traits = std::char_traits<char>, A =
boost::interprocess::allocator<char,
boost::interprocess::segment_manager<char,
boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_family,
boost::interprocess::offset_ptr<void>, 0u>, boost::interprocess::iset_index>
>]
/usr/include/boost/interprocess/containers/container/string.hpp:564: note:                
boost::interprocess_container::basic_string<CharT, Traits,
Alloc>::basic_string(const
boost::interprocess_container::basic_string<CharT, Traits, Alloc>&, typename
A::size_type, typename A::size_type, const A&) [with CharT = char, Traits =
std::char_traits<char>, A = boost::interprocess::allocator<char,
boost::interprocess::segment_manager<char,
boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_family,
boost::interprocess::offset_ptr<void>, 0u>, boost::interprocess::iset_index>
>]
/usr/include/boost/interprocess/containers/container/string.hpp:557: note:                
boost::interprocess_container::basic_string<CharT, Traits,
Alloc>::basic_string(boost::interprocess::rv<boost::interprocess_container::basic_string<CharT,
Traits, Alloc> >&) [with CharT = char, Traits = std::char_traits<char>, A =
boost::interprocess::allocator<char,
boost::interprocess::segment_manager<char,
boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_family,
boost::interprocess::offset_ptr<void>, 0u>, boost::interprocess::iset_index>
>]
/usr/include/boost/interprocess/containers/container/string.hpp:548: note:                
boost::interprocess_container::basic_string<CharT, Traits,
Alloc>::basic_string(const
boost::interprocess_container::basic_string<CharT, Traits, Alloc>&) [with
CharT = char, Traits = std::char_traits<char>, A =
boost::interprocess::allocator<char,
boost::interprocess::segment_manager<char,
boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_family,
boost::interprocess::offset_ptr<void>, 0u>, boost::interprocess::iset_index>
>]
/usr/include/boost/interprocess/containers/container/string.hpp:539: note:                
boost::interprocess_container::basic_string<CharT, Traits,
Alloc>::basic_string(const A&) [with CharT = char, Traits =
std::char_traits<char>, A = boost::interprocess::allocator<char,
boost::interprocess::segment_manager<char,
boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_family,
boost::interprocess::offset_ptr<void>, 0u>, boost::interprocess::iset_index>
>]
/usr/include/boost/interprocess/containers/container/string.hpp:532: note:                
boost::interprocess_container::basic_string<CharT, Traits,
Alloc>::basic_string(boost::interprocess_container::basic_string<CharT,
Traits, Alloc>::reserve_t, size_t, const A&) [with CharT = char, Traits =
std::char_traits<char>, A = boost::interprocess::allocator<char,
boost::interprocess::segment_manager<char,
boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_family,
boost::interprocess::offset_ptr<void>, 0u>, boost::interprocess::iset_index>
>]

Thanks in advance.

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