umap.cpp #1

#include <stdio.h>
#include <unordered_map>
#include <string>

using namespace std;

int main(int argc, const char *argv[])
{
    auto m = new unordered_map<int, string *>();
    string *s = (*m)[3];
    if (!s) {
        printf("no string here\n");
        s = new string();
        (*m)[3] = s;
    }
    s->append("foo");
    printf("%s\n", s->c_str());
    printf("%s\n", (*m)[3]->c_str());

    return 0;
}