66
77
88template <typename  T>
9+ /* *
10+  * Computes the sum of two values of the same type. 
11+  *  
12+  * @param a The first addend of type T. 
13+  * @param b The second addend of type T. 
14+  * @return The sum of a and b, which will be of the same type T. 
15+  */  
916T a_plus_b (T a, T b) {
1017    return  a + b;
1118}
1219
1320
21+ /* *
22+  * Executes an SQL query on a provided SQLite database and returns the result as a vector of string vectors. 
23+  * 
24+  * @param db Pointer to the SQLite database object to execute the query on. 
25+  * @param query SQL query string to be executed. 
26+  * @return A vector of vectors of strings, where each inner vector represents a row from the query result. 
27+  *         If the query execution fails, an empty vector is returned. 
28+  */  
1429std::vector<std::vector<std::string>> sqlite (sqlite3* db, const  std::string& query) {
1530    std::vector<std::vector<std::string>> results;
1631    sqlite3_stmt* stmt;
@@ -38,6 +53,17 @@ std::vector<std::vector<std::string>> sqlite(sqlite3* db, const std::string& que
3853
3954
4055template <typename  T, typename  F>
56+ /* *
57+  * Compares two items using a key mapping function and returns an integer  
58+  * indicating their order based on the key values. 
59+  *  
60+  * @param key_map A function object that extracts the key from each item to be compared. 
61+  * @param item1 The first item to compare. 
62+  * @param item2 The second item to compare. 
63+  * @return -1 if the key of item1 is less than the key of item2,  
64+  *         1 if the key of item1 is greater than the key of item2, 
65+  *         0 if the keys are equal. 
66+  */  
4167int  compare (F key_map, const  T& item1, const  T& item2) {
4268    auto  val1 = key_map (item1);
4369    auto  val2 = key_map (item2);
@@ -48,6 +74,13 @@ int compare(F key_map, const T& item1, const T& item2) {
4874}
4975
5076
77+ /* *
78+  * Generates a random string of alphabets with the specified length. 
79+  * The string contains a mix of uppercase and lowercase English letters. 
80+  *  
81+  * @param length The length of the random alphabet string to generate. 
82+  * @return A randomly generated string of alphabets of the specified length. 
83+  */  
5184std::string random_alphabets (int  length) {
5285    static  const  std::string chars =
5386        " abcdefghijklmnopqrstuvwxyz" 
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