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The replace( ) function has several other forms Three more commonly used forms are described here All return a reference to the invoking string The following form of replace( ) takes a null-terminated string as the replacement string: string &replace(size_type indx, size_type len, const char *str) Beginning at indx within the invoking string, it replaces up to len characters with the string in str To replace a substring with a portion of another string, use this form: string &replace(size_type indx1, size_type len1, const string &str, size_type indx2, size_type len2) It replaces up to len1 characters in the invoking string, beginning at indx1, with the len2 characters from the string in str, beginning at indx2 The next form of replace( ) operates on iterators: string &replace(iterator start, iterator end, const string &str) The range specified by start and end is replaced with the characters in str The search_and_replace( ) function operates in a case-sensitive manner It is possible to perform a case-insensitive search-and-replace, but it takes a little work One way is to implement a case-insensitive search function that uses the standard search( ) STL algorithm This algorithm lets you specify a binary predicate that can be tailored to test two characters for equality in a case-independent manner You can then use this function to find the location of the substring to be removed To see this approach in action, see Create Case-Insensitive Search and Search-and-Replace Functions for string Objects
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Headers <string> Classes string Functions iterator begin( ) iterator end( ) reverse_iterator rbegin( ) reverse_iterator rend( ) iterator erase(iterator start, iterator end) template <class InIter> void insert(iterator itr, InIter start, InIter end) string &replace(iterator start, iterator end, const char *str) template <class InIter, class T> InIter find(InIter start, InIter end, const T &val) template <class InIter, class OutIter, class Func> OutIter transform(InIter start, InIter end, OutIter result, Func unaryFunc)
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<algorithm>
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This recipe shows how to use iterators with objects of type string As most readers will know, iterators are objects that act much like pointers They give you the ability to refer to the contents of a container by using a pointer-like syntax They are also the mechanism that lets different types of containers be handled in the same way and enables different types of containers to exchange data They are one of C++'s most powerful concepts As explained in the overview of string near the start of this chapter, basic_string fulfills the basic requirements of a container Therefore, the string specialization of basic_string is, essentially, a container for characters One of the requirements of all containers is that they support iterators By supporting iterators, string gains three important benefits: 1 Iterators can streamline some types of string operations 2 Iterators enable string objects to be operated on by the various STL algorithms 3 Iterators enable string to be compatible with other STL containers For example, through iterators, you can copy the characters in a string into a vector or construct a string from characters stored in a deque
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The string class supports all basic iterator operations It also provides versions of several of the functions, such as insert( ) and replace( ), that are designed to work through iterators This recipe demonstrates the basic iterator operations and three iterator-enabled functions, and shows how iterators enable string to be integrated into the overall framework of the STL
NOTE For a detailed discussion of iterators, see 3, which presents STL-based recipes
Step-by-Step
To operate on a string through iterators involves these steps: 1 Declare a variable that will hold an iterator To do this, you must use one of the iterator types defined by string, such as iterator or reverse_iterator 2 To obtain an iterator to the start of a string, call begin( ) 3 To obtain an iterator to the end of a string, call end( ) 4 To obtain a reverse iterator to the start of the reversed string, call rbegin( ) 5 To obtain a reverse iterator to the end of the reversed string, call rend( ) 6 You can cycle through the characters in a string through an iterator in much the same way that you can use a pointer to cycle through the elements of an array 7 You can create a string object that is initialized with the characters pointed to by a range of iterators Among other uses, this lets you construct a string that contains elements from another type of container, such as a vector 8 Many of the functions defined by string define versions that operate through iterators The ones demonstrated by this recipe are erase( ), insert( ), and replace( ) They enable you to remove, insert, or replace characters within a string given iterators to the endpoints of the characters 9 Because the STL algorithms work through iterators, you can use any of the algorithms on objects of type string Two are demonstrated here: find( ) and transform( ) They require the <algorithm> header
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