Page157_sizeof.cpp

#include <iostream>
#include <string>
#include <vector>
using std::cout;
using std::endl;
using std::string;
using std::vector;
int main()
{
    string s = "This is the string. Ask for my size.";
    string s2;
    vector<int> v = {2, 3, 5, 7, 9};
    vector<int> v2;
    vector<double> v3;
    cout << "size of a string returned by sizeof: " << sizeof(s) << " "
         << sizeof(s2) << endl;
    cout << "size of a string returned by string.size: " << s.size() << endl;
    cout << "size of a vector: " << sizeof(v) << " "
         << sizeof(vector<string>) << endl;
    cout << "size of a vector returned by vector.size: " << v.size() << endl;
    return 0;
}

// Note: result returned by sizeof of a string or vector is a fixed value.
// It doesn't matter what type vector is and how many elements in a vector or
// string.