C++程序设计语言练习16.3 find_if的使用

代码如下：

#include <iostream>
#include <vector>
#include <string>
#include <algorithm>

using std::vector;
using std::string;
using std::cout;

bool isfirsta(string s)
{
	return (s[0] == 'a' || s[0] == 'A');
}
bool isnotfirsta(string s)
{
	return (s[0] != 'a' && s[0] != 'A');
}

int _tmain(int argc, _TCHAR* argv[])
{
	string s[6] = { "pear", "apple", "peach","grape","kiwifruit","ashis"};
	vector<string> vs(s, s+6);
	sort(vs.begin(), vs.end());

	vector<string>::iterator vscp1 = find_if(vs.begin(), vs.end(), isfirsta);
	vector<string>::iterator vscpe = find_if(vscp1, vs.end(), isnotfirsta);
	if (vscp1 == vscpe)
	{
		cout << *vscp1;
		cout << "\n";
	}
	else
	{
		for (vector<string>::iterator iter = vscp1; iter != vscpe; iter++)
		{
			cout << *iter;
			cout << "\n";
			
		}
	}

	return 0;
}