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"
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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"
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Note that assignment to a substring is not a conformal operation: the two sides of the assignment operator do not require the same number of characters.
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