c++ - statically typed language

gistfile1.cpp

#include <map>
#include <iostream> 
using namespace std;

int main(int argc, char *argv[]) {
    // map of int -> string
    // note that string is not included
    map<int, std::string> m;
    // assigning integer instead of string 
    // compiles just fine, sigh...
    m[1] = 42;
    cout << "m[1]=" << m[1] << endl;
}