用VS2013编写《C++ primer》上的393页地图单词转换有关问题

用VS2013编写《C++ primer》上的393页map单词转换问题
提示这个错误，找不到外部符号
1>.obj源 : error LNK2019: 无法解析的外部符号 "class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const & __cdecl transform(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &,class std::map<class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >,class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >,struct std::less<class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > >,class std::allocator<struct std::pair<class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const ,class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > > > > const &)" (?transform@@YAABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@ABV12@ABV?$map@V?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@V12@U?$less@V?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@2@V?$allocator@U?$pair@$$CBV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@V12@@std@@@2@@2@@Z)，该符号在函数 "void __cdecl word_transform(class std::basic_ifstream<char,struct std::char_traits<char> > &,class std::basic_ifstream<char,struct std::char_traits<char> > &)" (?word_transform@@YAXAAV?$basic_ifstream@DU?$char_traits@D@std@@@std@@0@Z) 中被引用

#include<iostream>

#include<fstream>

#include<vector>

#include<string>

#include<map>

#include<sstream>

//#pragma comment( lib, "ws2_32.lib.lib")

//#pragma comment( lib, "opencv_core231d.lib")

using namespace std;


map<string, string> buildMap(ifstream &map_file);

string &transform(string &s, map<string, string> &m);

void word_transform(ifstream &map_file, ifstream &input);


void word_transform(ifstream &map_file, ifstream &input)

{

	auto trans_map = buildMap(map_file);

	string text;

	while (getline(input, text)){

		istringstream stream(text);

		string word;

		bool firstword = true;

		while (stream >> word){

			if (firstword)

				firstword = false;

			else

				cout << " ";

			auto ou = transform(word, trans_map);

			cout << ou; //此句加上 就出现无外部链接 

		}

		cout << endl;

	}


}


map<string, string> buildMap(ifstream &map_file){

	map<string, string> trans_map;

	string key;

	string value;

	while (map_file >> key && getline(map_file, value)){

		if (value.size() > 1)

			trans_map[key] = value.substr(1);

		else

			throw runtime_error("no rule for" + key);

	}

	return trans_map;

}


string &trasform( string &s,  map<string, string> &m)

{

	auto map_it = m.find(s);

	if (map_it != m.cend())

	{

		cout << map_it->second;

		return map_it->second;

	}

	else

		cout<< s;

	return  s;

}


int main()

{

	ifstream map_file, input;

	map_file.open("d:\\regular.txt");

	input.open("d:\\translate.txt");

	word_transform(map_file, input);

	map_file.close();

	input.close();

	return 0;

}

------解决思路----------------------
transform没有定义啊

用VS2013编写《C++ primer》上的393页地图单词转换有关问题

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