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#include <boost/vector_property_map.hpp>
#include <string>
#include <iostream>

int main()
    boost::vector_property_map<std::string> m;
    // Assign string to '4'. 
    m[4] = "e";
    std::cout << "'" << m[4] << "'\n";
    // Grab string from '10'. Since none is associated,
    // "" will be returned.
    std::cout << "'" << m[10] << "'\n";