A separate RWCSubString class supports substring extraction and modification. There are no public constructors; RWCSubStrings are constructed indirectly by various member functions of RWCString, and destroyed at the first opportunity.
You can use substrings in a variety of situations. For example, you can create a substring with RWCString::operator(), then use it to initialize an RWCString:
RWCString s("this is a string"); // Construct an RWCString from a substring: RWCString s2 = s(0, 4); // "this"
The result is a string s2 that contains a copy of the first four characters of s.
You can also use RWSubStrings as lvalues in an assignment to a character string, or to an RWCString or RWCSubString:
// Construct an RWCString: RWCString article("the"); RWCString s("this is a string"); s(0, 4) = "that"; // "that is a string" s(8, 1) = article; // "that is the string"
Note that assignment to a substring is not a conformal operation: the two sides of the assignment operator need not have the same number of characters.
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