熟悉SGI STL的请进

[dibotiger]

VC6自带的STL的list无法排序, 就下载了SGI STL, 替换了VC6 自带的STL

测试代码如下(VC6的STL环境编译无误, 替换SGI STL后, 出现如下编译错误):

#include <stdio.h>
#include <stdlib.h>
#include <windows.h>
#include <string>
#include <list>
using namespace std;

typedef struct tagURLDNSWITHCOUNT
{
	char  szurldns[1024];
	DWORD dwcount;
}URLDNSCOUNT;

typedef list<URLDNSCOUNT>	URLDNSCOUNTS;
URLDNSCOUNTS		listURLCOUNTS;


void printflist()
{
	URLDNSCOUNTS::iterator i;
	for(i=listURLCOUNTS.begin();i!=listURLCOUNTS.end();++i)
	{
		printf("%s-%d\n",i->szurldns,i->dwcount);
	}
}

void main(int argc, char *argv[])
{
	URLDNSCOUNT oneURLDNSCOUNT={0},twoURLDNSCOUNT={0},threeURLDNSCOUNT={0};
	sprintf(oneURLDNSCOUNT.szurldns,"111");
    oneURLDNSCOUNT.dwcount=123;
	sprintf(twoURLDNSCOUNT.szurldns,"222");
	twoURLDNSCOUNT.dwcount=33;
	sprintf(threeURLDNSCOUNT.szurldns,"333");
    threeURLDNSCOUNT.dwcount=99;
	listURLCOUNTS.push_back(oneURLDNSCOUNT);
	listURLCOUNTS.push_back(twoURLDNSCOUNT);
	listURLCOUNTS.push_back(threeURLDNSCOUNT);

	printflist();
	//listURLCOUNTS.sort();
}

Compiling...
test.cpp
E:\test\test.cpp(23) : error C2819: type 'std::_List_iterator<struct tagURLDNSWITHCOUNT,struct tagURLDNSWITHCOUNT &,struct tagURLDNSWITHCOUNT *>' does not have an overloaded member 'operator ->'
E:\test\test.cpp(23) : error C2227: left of '->szurldns' must point to class/struct/union
E:\test\test.cpp(23) : error C2819: type 'std::_List_iterator<struct tagURLDNSWITHCOUNT,struct tagURLDNSWITHCOUNT &,struct tagURLDNSWITHCOUNT *>' does not have an overloaded member 'operator ->'
E:\test\test.cpp(23) : error C2227: left of '->dwcount' must point to class/struct/union
Error executing cl.exe.


另外, 如果我希望能够对list里的dwcount节点进行排序, 该如何实现?

[oyljerry]

你这种直接用VS2012或以上的新版本编译器好了，对STL支持很好了

[珍惜生命远离CPP]

你的问题和STL版本无关少了结构体排序需要自定义operator< 另外VC6已经是18年前的东西了,赶紧升级到VS2015吧.

#include <stdio.h>
#include <stdlib.h>
//#include <windows.h>
#include <string>
#include <list>
using namespace std;
typedef unsigned int DWORD;

typedef struct tagURLDNSWITHCOUNT
{
    char  szurldns[1024];
    DWORD dwcount;
} URLDNSCOUNT;

typedef list<URLDNSCOUNT>    URLDNSCOUNTS;
URLDNSCOUNTS        listURLCOUNTS;

bool operator<(const URLDNSCOUNT& l,const URLDNSCOUNT&r){ return l.dwcount<r.dwcount;}
void printflist()
{
    URLDNSCOUNTS::iterator i;

    for( i = listURLCOUNTS.begin(); i != listURLCOUNTS.end(); ++i )
    {
        printf( "%s-%d\n", i->szurldns, i->dwcount );
    }
}

void main( int argc, char *argv[] )
{
    URLDNSCOUNT oneURLDNSCOUNT = {0}, twoURLDNSCOUNT = {0}, threeURLDNSCOUNT = {0};
    sprintf( oneURLDNSCOUNT.szurldns, "111" );
    oneURLDNSCOUNT.dwcount = 123;
    sprintf( twoURLDNSCOUNT.szurldns, "222" );
    twoURLDNSCOUNT.dwcount = 33;
    sprintf( threeURLDNSCOUNT.szurldns, "333" );
    threeURLDNSCOUNT.dwcount = 99;
    listURLCOUNTS.push_back( oneURLDNSCOUNT );
    listURLCOUNTS.push_back( twoURLDNSCOUNT );
    listURLCOUNTS.push_back( threeURLDNSCOUNT );

    printflist();
	puts("");
    listURLCOUNTS.sort();
	printflist();
}