What an great library!
I am trying to extend one of the shared memory examples but I am getting a compilation error. Basically I have added a vector of char_strings to the complex object and added a method to add a string to the vector. If anyone would take a moment to give me suggestion for how to fix this issue or a suggestion for how I should better add strings to this vector I would appreciate your input.
The error is:
error C2664: 'void boost::container::vector<T,A>::push_back(const boost::interprocess::rv<T> &)' : cannot convert parameter 1 from 'char_string *' to 'const boost::interprocess::rv<T> &'
with [T=char_string, A=char_allocator]
and[T=boost::container::basic_string<char,std::char_traits<char>,char_allocator>]
Reason: cannot convert from 'char_string *' to 'const boost::interprocess::rv<T>'
with [T=boost::container::basic_string<char,std::char_traits<char>,char_allocator>]
No constructor could take the source type, or constructor overload resolution was ambiguous
The code is:
#include <boost/interprocess/managed_shared_memory.hpp>
#include <boost/interprocess/allocators/allocator.hpp>
#include <boost/interprocess/containers/map.hpp>
#include <boost/interprocess/containers/vector.hpp>
#include <boost/interprocess/containers/string.hpp>
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;
typedef vector<char_string, char_allocator> char_string_vector_vector;
class complex_data
{
public: //Obviously making the variables of complex_data public isn't a good idea I am just playing here for the moment
int id_;
char_string char_string_;
char_string_vector_vector char_string_vector_vector_;
double price_;
//Since void_allocator is convertible to any other allocator<T>, we simplify
//the initialization taking just one allocator for all inner containers.
complex_data(int id, const char *name, double prce, const void_allocator &void_alloc)
: id_(id), char_string_(name, void_alloc), char_string_vector_vector_(void_alloc), price_(prce)
{}
// add a string --> Error is on the next line
void addStringItem(char_string* s){char_string_vector_vector_.push_back(s);}
};
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_data *mymap = segment.construct<complex_data>("Complex_Data")(7, "hi", 7.0, alloc_inst);
//
return 0;
}