为什么会出现basic_ifstream>的链接错误

[WulalaOlala]

ModeThread.cpp
void ModeThread::loadinThread()
{
	std::ifstream fload("gesture_type.gtp");
	int numLine;
	fload>>numLine;
	for (int i = 0;i<numLine;i++)
	{
		std::string str;
		int num;
		fload>>str>>num;
		gstVector.push_back(GestVector(QString(QString::fromLocal8Bit(str.c_str())),num));
	}
	((DgSVM *)pSvm)->load();
}

以上为代码， 只关心ifstream.为什么会出现如下链接错误？

ModeThread.obj : error LNK2019: 无法解析的外部符号 "__declspec(dllimport) public: void __thiscall std::basic_ifstream<char,struct std::char_traits<char> >::`vbase destructor'(void)" (__imp_??_D?$basic_ifstream@DU?$char_traits@D@std@@@std@@QAEXXZ)，该符号在函数 "public: void __thiscall ModeThread::loadinThread(void)" (?loadinThread@ModeThread@@QAEXXZ) 中被引用

[buyong]

试试stlport

[zhaokai115]

没有#include <iostream>?