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This function just forwards its work to the library find_if function, which we used in 611/103 The predicate that we pass to find_if is one that we will write, named not_url_char It will return true when passed a character that cannot be in a URL:

SWTBORDER Creates a composite widget with a border SWTNO_RADIO_GROUP Prevents child radio button behavior

Effective Java: Programming Language Guide public static String classify(Collection c) { return "Unknown Collection"; } public static void main(String[] args) { Collection[] tests = new Collection[] { new HashSet(), // A Set new ArrayList(), // A List new HashMap()values() // Neither Set nor List }; for (int i = 0; i < testslength; i++) Systemoutprintln(classify(tests[i]));

bool not_url_char(char c) { // characters, in addition to alphanumerics, that can appear in a URL static const string url_ch = "~;/ :@= // see whether c can appear in a URL and return the negative return !(isalnum(c) || find(url_chbegin(), url_chend(), c) != url_chend()); }

The example code that follows replaces the composite in the previous example with a group widget (see Figure 4 12)

import orgeclipseswt*; import orgeclipseswtevents*; import orgeclipseswtwidgets*;

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Despite being small, this function uses a fair bit of new material First is the use of the static storage class specifier Local variables that are declared to be static are preserved across invocations of the function Thus, we will create and initialize the string url_ch only on the first call to not_url_char Subsequent calls will use the object that the first call created Because url_ch is a const string, its value will not change once we have initialized it The not_url_char function also uses the isalnum function, which the <cctype> header defines This function tests whether its argument is an alphanumeric character (a letter or a digit) Finally, find is another algorithm that we haven't used yet It is similar to find_if, except that instead of calling a predicate, it looks for the specific value given as its third argument As with find_if, if the value that we want is present, the function returns an iterator denoting the first occurrence of the value in the given sequence If the value is not found, then find returns its second argument With this information in hand, we can now understand the not_url_char function Because we negate the value of the entire expression before we return it, not_url_char will yield false if c is a letter, a digit, or any of the characters in

public class GroupExample { public static void main(String[] args) { Display display = new Display(); Shell shell = new Shell(display); shellsetText("Group Example"); shellsetBounds(100, 100, 200, 200); Group group = new Group(shell, SWTNULL); groupsetText("My Group"); groupsetBounds(25, 25, 150, 125); final Button button = new Button(group, SWTPUSH); buttonsetBounds(25, 25, 100, 75); buttonsetText("Click Me Now"); buttonaddSelectionListener(new SelectionAdapter() { public void widgetSelected(SelectionEvent event) { buttonsetText("I Was Clicked"); } }); shellopen(); while (!shellisDisposed()) { if (!displayreadAndDispatch()) displaysleep(); } displaydispose(); } }

A group widget is created as a child of the shell and acts as the parent of the button widget In addition to the border, which is always present, the group widget also has a label

url_ch If c is any other value, the function returns true Now the hard part begins: implementing url_beg This function is messy, because it must deal with the possibility that the input might contain :// in a context that cannot be a valid URL In practice, we'd probably have a list of acceptable protocol-names and look only for those For simplicity, though, we'll limit ourselves to being sure that one or more letters precede the :// separator, and at least one character follows it:

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