CODEWITHSUNDEEP
c++visual-studio
JimR
JimR

Reputation: 2225

error LNK2019: unresolved external symbol - what am I doing wrong?

When I try and build my project I get the following errors:

1>Assignment1CoreTest.obj : error LNK2019: unresolved external symbol "struct point * __cdecl findLongPaths(struct point *,double)" (?findLongPaths@@YAPAUpoint@@PAU1@N@Z) referenced in function "public: void __thiscall Geometry_CoreUnitTest::test_method(void)" (?test_method@Geometry_CoreUnitTest@@QAEXXZ)
1>Assignment1CoreTest.obj : error LNK2019: unresolved external symbol "double __cdecl calculateLineLength(struct point *)" (?calculateLineLength@@YANPAUpoint@@@Z) referenced in function "public: void __thiscall Geometry_CoreUnitTest::test_method(void)" (?test_method@Geometry_CoreUnitTest@@QAEXXZ)
1>C:\Users\user\documents\visual studio 2010\Projects\Assignment1\Debug\Assignment1.exe : fatal error LNK1120: 2 unresolved externals

I've been trying to work out why for the last hour or so and have made absolutely no progress so I was wondering if anyone might be able to point me in the right direction. Obviously I'm doing something stupid but I can't work out what.

This is my AssignmentOneCoreTest.cpp:

#define BOOST_TEST_MODULE Test_Assignment1

#include <boost/test/unit_test.hpp>

#include "geometry.h"

BOOST_AUTO_TEST_CASE(Geometry_CoreUnitTest) {
    point p[3] = {{0,0}, {0,3}, {0,1, true}};
    point longest[2] = {{0,1}, {0,3,true}};
    BOOST_CHECK_EQUAL(calculateLineLength(p), 5);

    point *longest_calculated = findLongPaths(p, 1.1);
    BOOST_CHECK_EQUAL(longest_calculated[1].y, longest[1].y);
    delete longest_calculated;
}

Geometry.cpp:

#include "geometry.h"
#include <iostream>
using namespace std; 

double calculateLineLength(point *points)
{
    ...
}

point *findLongPaths(point *points, double threshold_distance)
{
    ...
}

and Geometry.h:

#ifndef GEOMETRY_H
#define GEOMETRY_H

typedef struct {
    int x;
    int y;
    bool end;
} point;

double calculateLineLength(point *points);
point *findLongPaths(point *points, double threshold_distance);

#endif

I'm totally stumped and starting to get kinda frustrated, what am I overlooking?

Upvotes: 0

Views: 1543

Answers (1)

A. K.
A. K.

Reputation: 38098

you are getting linker error. Most probably you are not generating the object code for Geometry.cpp

this would work for now:

  1. create an empty project;
  2. copy the header files in the headerfiles folder
  3. copy the cpp files in the cpp files folder

then build the project;

this will build your Geometry.cpp program as well.

Upvotes: 1

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