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Iterators kan van één element aan volgende worden vooruitgegaan door hen te verhogen. Some iterators can also be decremented or allow arbitrary jumps from one element to another, as we will see later. When they are dereferenced, iterators yield a reference to a container element. In addition, they can be compared to each other for equality or inequality.

Iterators interact seamlessly with built-in C++ types. In particular, native C++ pointers are treated as iterators to C++ arrays. Naturally, all containers in the Standard C++ Library define an iterator type, i.e., a nested type iterator that represent their respective pointer-like type.

Iterator Categories Iterators fall into categories. This is because different algorithms impose different requirements on an iterator they use. For example, the find() algorithms needs an iterator that can be advanced by incrementing it, whereas the reverse() algorithm needs an iterator that can be decremented as well, etc. Ultimately, there are five categories of iterators in STL and Standard C++ Library:

input iterators
output iterators
forward iterators
bidirectional iterators
random access iterators

An iterator category is an abstraction. It represents a set of requirements to an iterator.

STL

The Standard Template Library is a new C++ library that provides a set of easily composable C++ container classes and generic algorithms (template functions).

The container classes include vectors, lists, deques, sets, multisets, maps, multimaps, stacks, queues and priority queues.
The generic algorithms include a broad range of fundamental algorithms for the most common kinds of data manipulations, such as searching, sorting, merging, copying, and transforming.

At its July 1994 meeting, the ANSI/ISO C++ Standards Committee voted to adopt STL as part of the standard C++ library. The STL proposal to the committee by Alex Stepanov and Meng Lee of Hewlett-Packard Labs was based on research on generic programming and generic software libraries that Stepanov, Lee, and David Musser have been working on for several years, in Scheme, Ada, and C++.

String

C++ supports characters strings two ways. The first is as a null-terminated character array. This is sometimes referred to as a C string. The second way is as a class object of type basic_string. The basic_string class is essentially a container. this means that iterators and the STL algorithms can operate on string. However, string has additional capabilities.

C++ string recognizes operators: <, <=, >, >=, ==, !=, =, += .
When you use template functions, or classes you don't need to write addition function with strcpy, ctrcmp of ctrcat... In this case C++ string works like any of built-in data type.

String functions.C++ string, like any of container classes, has its own public functions, that add a lot of flexibility for manipulation of C++ string data type.

Overflowing.
You don't need to think about overflowing or null-terminating character. C++ string allows use sequence of characters as long as allows ability of your OS.

More C Programming Examples and Help

Stdio Functions