Sunday, 25 December 2016

c++ - error LNK2019: unresolved external symbol error?

Can any1 tell me why I'm getting this error.




template header file (prog.h):



#include 
#include
#include
#include
#include
using namespace std;


#ifndef H_PROG
#define H_PROG

// data files

#define D1 "data1.txt"

#define INT_SZ 4 // width of integer
#define FLT_SZ 7 // width of floating-pt number
#define STR_SZ 12 // width of string


#define INT_LN 15 // no of integers on single line
#define FLT_LN 9 // no of floating-pt nums on single line
#define STR_LN 5 // no of strings on single line

// function and class prototypes

// stores items from input file into vector
template < class T >
void get_list ( vector < T >&, const char* );


#endif


.cpp file :



#include "prog.h"
#include



template < class T >
void get_list ( vector < T >& vector1, const char* filename )
{
ifstream infile;
ofstream outfile;

infile.open(filename);
if(infile.fail())
{
cout<<"File did not open."<
}
else
{
T data;
while(infile)
{
infile>>data;
vector1.insert(data);
}
}

}


in the main function I have :



#include "prog.h"
#include

int main ( )
{

vector < int > v1;
vector < float > v2;
vector < string > v3;


// first heap

cout << "first heap - ascending order:\n\n";
get_list(v1,D1);


_getch();
return 0;
}





when i try to run this i get an error saying :



error LNK2019: unresolved external symbol "void __cdecl get_list(class std::vector > &,char const *)" (??$get_list@H@@YAXAAV?$vector@HV?$allocator@H@std@@@std@@PBD@Z) referenced in function _main

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