C++ 使用内联函数实现结构体按结构体某成员大小排序

#include "stdafx.h"
#include 
#include 
#include 
using namespace std;

struct information
{
	int a;
	int b;
	int c;
	int d;

	information()
	{
		a = 0;
		b = 1;
		c = 2;
		d = 3;
	}
};

inline bool compareIfo(information x1, information x2)
{
	return x1.a > x2.a;
}

int _tmain(int argc, _TCHAR* argv[])
{
	vector vecIfo;
	information ifo1;
	ifo1.a = 0;
	ifo1.b = 1;
	ifo1.c = 2;
	ifo1.d = 3;
	vecIfo.push_back(ifo1);

	information ifo2;
	ifo2.a = 1;
	ifo2.b = 1;
	ifo2.c = 2;
	ifo2.d = 3;
	vecIfo.push_back(ifo2);

	sort(vecIfo.begin(), vecIfo.end(), compareIfo);
	return 0;
}