These are some old concepts used in 16 bit intel architectures in the days of MS DOS, not much useful anymore.
Near pointer is used to store 16 bit addresses means within current segment on a 16 bit machine. The limitation is that we can only access 64kb of data at a time.
A far pointer is typically 32 bit that can access memory outside current segment. To use this, compiler allocates a segment register to store segment address, then another register to store offset within current segment.
Like far pointer, huge pointer is also typically 32 bit and can access outside segment. In case of far pointers, a segment is fixed. In far pointer, the segment part cannot be modified, but in Huge it can be
See below links for more details.
Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above
- Implement your own tail (Read last n lines of a huge file)
- Features and Use of Pointers in C/C++
- Applications of Pointers in C/C++
- Pointers vs References in C++
- Pointers in C/C++ with Examples
- Smart Pointers in C++
- The length of a string using pointers
- Output of C programs | Set 64 (Pointers)
- What are Wild Pointers? How can we avoid?
- C program to sort an array using pointers
- Program to reverse an array using pointers
- Why C treats array parameters as pointers?
- Pointers in C and C++ | Set 1 (Introduction, Arithmetic and Array)
- Program to Reverse a String using Pointers
- Difference between Iterators and Pointers in C/C++ with Examples