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59 lines
2.5 KiB
C++
59 lines
2.5 KiB
C++
#include <boost/interprocess/detail/config_begin.hpp>
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#include <boost/interprocess/detail/workaround.hpp>
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#include <boost/interprocess/managed_shared_memory.hpp>
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#include <boost/interprocess/containers/vector.hpp>
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#include <boost/interprocess/containers/string.hpp>
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#include <boost/interprocess/allocators/allocator.hpp>
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int main ()
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{
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using namespace boost::interprocess;
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//Typedefs
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typedef allocator<char, managed_shared_memory::segment_manager>
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CharAllocator;
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typedef basic_string<char, std::char_traits<char>, CharAllocator>
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MyShmString;
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typedef allocator<MyShmString, managed_shared_memory::segment_manager>
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StringAllocator;
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typedef vector<MyShmString, StringAllocator>
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MyShmStringVector;
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//Open shared memory
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shared_memory_object::remove("myshm");
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managed_shared_memory shm(create_only, "myshm", 10000);
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//Create allocators
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CharAllocator charallocator (shm.get_segment_manager());
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StringAllocator stringallocator(shm.get_segment_manager());
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//This string is in only in this process (the pointer pointing to the
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//buffer that will hold the text is not in shared memory).
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//But the buffer that will hold "this is my text" is allocated from
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//shared memory
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MyShmString mystring(charallocator);
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mystring = "this is my text";
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//This vector is only in this process (the pointer pointing to the
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//buffer that will hold the MyShmString-s is not in shared memory).
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//But the buffer that will hold 10 MyShmString-s is allocated from
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//shared memory using StringAllocator. Since strings use a shared
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//memory allocator (CharAllocator) the 10 buffers that hold
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//"this is my text" text are also in shared memory.
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MyShmStringVector myvector(stringallocator);
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myvector.insert(myvector.begin(), 10, mystring);
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//This vector is fully constructed in shared memory. All pointers
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//buffers are constructed in the same shared memory segment
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//This vector can be safely accessed from other processes.
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MyShmStringVector *myshmvector =
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shm.construct<MyShmStringVector>("myshmvector")(stringallocator);
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myshmvector->insert(myshmvector->begin(), 10, mystring);
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//Destroy vector. This will free all strings that the vector contains
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shm.destroy_ptr(myshmvector);
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return 0;
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}
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#include <boost/interprocess/detail/config_end.hpp>
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