mms usage sample

mss-usage-sample.cpp

// Declare a type
template<class StoragePolicy>
struct My {
    int i;
    mms::string<StoragePolicy> str;
    mms::map<StoragePolicy, mms::string<StoragePolicy>, int> map;

    // Field introspection
    template<class Action>
    void traverseFields(Action a) const { a(i)(str)(map); }
};

// Create and populate a value
My<mms::Standalone> my;
my.i = 22;
my.str = "a string";
my.map.insert(std::make_pair("ten", 10));
my.map.insert(std::make_pair("eleven", 11));
my.map.insert(std::make_pair("twelve", 12));

// Serialize it
std::ofstream out("filename");
size_t pos = mms::write(out, my);

// mmap(2) it
const char* ptr = mmap(...);

// Just cast the address and you get a pointer to mmapped type
const My<mms::Mmapped>* pmy =
    reinterpret_cast<const My<mms::Mmapped>*>(ptr + pos);

// Read mmapped value (probably in another program,
// on another machine, etc...)
// Mmapped containers resemble STL-like interface
std::cout << pmy->i << std::endl;
std::cout << pmy->str << std::endl;
std::cout << pmy->map.size() << std::endl;
std::cout << pmy->map["twelve"] << std::endl;
BOOST_FOREACH(const auto& kv, pmy->map)
    std::cout << "map[" << kv.first << "] = " << kv.second << std::endl;