LNK 2019 and LNK 1120

Sun, 19 Feb 2012 08:39:30 -0700

I am new to c++ and am using visual 2010. I'm trying to get to grips with templates and have compiled the following code

1 #include "stdafx.h"
2
3 template<class T>
4 class Vcr {
5 int length; // number of entries
6 T* vr; // entries of vector
7 public:
8 template <class U> friend class Vcr;
9 Vcr(int, const T* const); // constructor
10 Vcr(int = 0, T = 0); // constructor
11 Vcr(const Vcr&); // copy of constructor
12 ~Vcr(){ delete[] vr;} // destructor
13
14 int size() const { return length; } // number of entries
15 Vcr& operator=(const Vcr&); // assignment
16 T& operator[](int i) { return vr[i]; } // subscripting
17 Vcr& operator+=(const Vcr&); // v += v2
18 T maxnorm() const; // maximum norm
19
20 template<class S> // dot product
21 friend S dot(const Vcr<S>&, const Vcr<S>&);
22
23 };
24
25 int _tmain(int argc, _TCHAR* argv[]) {
26
27 Vcr<double> (20);
28 return 0;
29 }

When I build the code I get the following error messages

: error LNK2019: unresolved external symbol "public: __thiscall Vcr<double>::Vcr<double>(int,double)" (??0?$Vcr@N@@QAE@HN@Z) referenced in function _wmain

: fatal error LNK1120: 1 unresolved externals

Any help would be appreciated.

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LNK 2019 and LNK 1120