You’ll be surprised to know that you have probably used the Strategy pattern in your everyday interactions with the Standard Library. After all, any time you specify a particular sorting algorithm, for example, you are specifying a sorting strategy, that is, providing a partial definition of the overall algorithm:
vector<int> values{3,1,5,2,4};
sort(values.begin(), values.end(), less<>{});
for (int x : values)
cout << x << ' '; // 1 2 3 4 5
In the preceding, the function less is a sorting strategy for the overall sorting algorithm. less is simply a wrapper template function for the
