#include <iostream>
#include <cstdlib>
#include <string>          //for class string
#include <algorithm>       //for find_if
#include <functional>      //for bind2nd, mem_fun
#include <ext/functional>  //for compose1
using namespace std;

int main()
{
	const string *a[] = {
		new string(""),
		new string("hello"),
		new string("goodbye")
	};
	const size_t n = sizeof a / sizeof a[0];

	const string *const *p = find_if(a, a + n, mem_fun(&string::size));

	if (p == a + n) {
		cout << "Every string was of length 0.\n";
	} else {
		cout << "The first non-empty string was a["
			<< p - a << "] == \"" << **p << "\".\n";
	}

	p = find_if(a, a + n,
		__gnu_cxx::compose1(
			bind2nd(equal_to<string::size_type>(), 7),
			mem_fun(&string::size)
		)
	);

	if (p == a + n) {
		cout << "No string was of length 7.\n";
	} else {
		cout << "The first string of length 7 was a["
			<< p - a << "] == \"" << **p << "\".\n";
	}

	for (const string *const *p = a + n - 1; p >= a; --p) {
		delete *p;
	}
	return EXIT_SUCCESS;
}