vector <string> in a map

Code:

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map <string, vector <string> > macros;

macros["some"][0] = "some string";
macros["another"][0] = "some string 2";
macros["another"][1] = "some string 3";

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Whats wrong with that?

It should probably be:

Code:

---

map <string, vector <string> > macros;

macros["some"].push_back("some string");
macros["another"].push_back("some string 2");
macros["another"].push_back("some string 3");

---

Consider the problem with this:

Code:

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vector<int> vec;
vec[0] = 1;

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Clearly vec is empty, so vec[0] does not exist.

Thank you..