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added another example

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[SVN r9103]
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Jeremy Siek 2001-02-11 03:01:47 +00:00
parent a5c3dcdd02
commit a84c46f6e3
1 changed files with 26 additions and 2 deletions
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filter_iterator.htm
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@ -189,8 +189,32 @@ This function provides a convenient way to create filter iterators.
<h3>Example</h3>
In this example we print the positive number again, this time using
the <tt>make_filter_iterator()</tt> function.
In this example we print out all numbers in the array that are
greater than negative two.
<pre>
int main()
{
int numbers[] = { 0, -1, 4, -3, 5, 8, -2 };
const int N = sizeof(numbers)/sizeof(int);
std::copy(boost::make_filter_iterator(numbers, numbers + N,
std::bind2nd(std::greater<int>(), -2)),
boost::make_filter_iterator(numbers + N, numbers + N,
std::bind2nd(std::greater<int>(), -2)),
std::ostream_iterator<int>(std::cout, " "));
std::cout << std::endl;
}
</pre>
The output is:
<pre>
0 -1 4 5 8
</pre>
<p>
In the next example we print the positive numbers using the
<tt>make_filter_iterator()</tt> function.
<pre>
struct is_positive_number {