STRING LIBRARY

Strings library

C++ Strings library

The C++ strings library provides the definitions of the basic_string class, which is a class template specifically designed to manipulate strings of characters of any character type. It also includes two specific instantiations:string and wstring, which respectively use char and wchar_t as character types.

string

String class (class)

The characteristics of characters taken into consideration in these classes are not only the type itself, but also a set of traits. These traits are defined by specializing the class template char_traits for the specific type. Default specifications exist for both char and wchar_t:

char_traits

Character traits (class template)

This reference uses as a base the string class, even though this is only one of the possible template instantiations (we believe this provides a better readability):

A set of global functions provide some additional functionality for strings to interact either with other string objects or with objects of other types, mainly through the overloading of operators:

operator+

Add strings (function)

swap

Swap contents of two strings (function )

comparison operators

String comparison operators (function)

The header also declares some functions that extend the functionality of streams (iostream library) to string objects:

getline

Get line from stream (function )

operator<<

Insert string into stream (function )

operator>>

Extract string from istream (function )

Notice that some other operators are also overloaded as members of class string (+=, =, []).