TEKPOOL

Singleton Pattern: Part 2 Thread-Safe implemenation

We looked into a trivial implementation of the singleton pattern in the previous post. The implementation was both lazy and non-thread safe. It’s lazy, because the singleton instance is created only when it’s required. The implementation was also not thread safe. So, if several calls were made into this method from a multi-threaded program, you could end up creating multiple instances of the class, and also mess up seriously since the system expects to have only one instance.

Singleton Pattern: Part 1 Trivial implemenation

The purpose of a singleton pattern is to ensure a unique instance of the class and to provide global access to this. It falls under the Creational patterns category.

The class implementing the singleton pattern will have to do the following items:

1. Provide an Instance Creation Method to the user.
2. Maintain the unique instance throughout the life of the program(s) in which this class is created.

String Pattern Matching: Write a function that checks for a given pattern at the end of a given string

In other words, Write a function, a variant of strstr that takes in 2 strings str1 and str2 and returns true if str2 occurs at the end of the string str1, and false otherwise.

bool str_str_end(char * str1, char * str2)
{
        // Store the base pointers of both strings
        char* beginStr1 = str1;
        char* beingStr2 = str2;

	   // Move to the end of the strings
        while(*str1++);

        while(*str2++);