C++ Primer 练习12.2.2

#include<iostream>
#include<memory>
#include<string>

using namespace std;

int main(int argc, char* argv[])
{
	allocator<string> alloc;
	string s;
	size_t i = 9;
	auto const p = alloc.allocate(i);
	auto q = p;
	
	while (cin >> s && q != p + i)
		alloc.construct(q++, s);
	const size_t sz = q - p;
	cout << sz << endl;
	
	for (size_t i = 0; i != sz; i++)
		cout << *(p + i) << endl;
		
	while (q != p)
		alloc.destroy(--q);
	alloc.deallocate(p, i);
    return 0;
}