Thread: sizeof string?

Code:

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

int main() {
	std::string s1 = "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa";
	std::string s2 = "a";
	cout << sizeof(s1) << endl;
	cout << sizeof(s2) << endl;
	cin.get();
}

Why does sizeof give me 32 for both strings?