i'm trying to use Dev-C++ to compile a quick little program that uses templates. Unfortunately, it isn't working. I am just learning templates, but I am pretty sure that Dev-C++ had me stick <T> in too many places... also, on the side-panel on the left side, when I click the class tab, it shows me two member functions and main(). It can compile, but refuses to link and I get these messages: [Linker error] undefined reference to `csmart<int>::csmart(int)' There are more, all exactly alike, or with a different member function. Here is the code for my program: <code> // file: csmart.h template <typename T> class csmart { private: //member variables T * m_value; int m_valid; public: //member functions csmart() { m_value = 0; m_valid = 0; } csmart(T val); ~csmart(); void SetValid(int valid); int Valid(); T Value(); csmart & operator=(const csmart & rhs); csmart & operator=(const T & rhs); }; // file: csmart.cpp #include "csmart.h" template <typename T> csmart<T>::csmart(T val) { //set m_value and NULL m_valid m_value = val; m_valid = 0; } template <typename T> csmart<T>::~csmart() { delete m_value; } template <typename T> void csmart<T>::SetValid(int valid) { //set m_valid to valid m_valid = valid; } template <typename T> int csmart<T>::Valid() { return m_valid; } template <typename T> T csmart<T>::Value() { return m_value; } template <typename T> csmart<T> & csmart<T>::operator=(const csmart<T> & rhs) { //set variables equal if (m_value == rhs.Value()) return *this; m_value = rhs.Value(); m_valid = rhs.Valid(); return *this; } template <typename T> csmart<T> & csmart<T>::operator=(const T &rhs) { //set to Type T - sort of dangerous if (m_value == rhs) return *this; m_value = rhs; return *this; } // file: main.cpp #include <iostream> #include "csmart.h" using namespace std; int main() { csmart<int> s_int(12); csmart<int> s_int_b(19); cout << "\nValue of s_int: " << s_int.Value(); cout << "\nValue of s_int_b: " << s_int_b.Value(); cout << endl; cout << "Swapping values..."; int temp; temp = s_int.Value(); s_int = s_int_b; s_int_b = temp; cout << endl << endl; cout << "Done.\n"; cout << "\nValue of s_int: " << s_int.Value(); cout << "\nValue of s_int_b: " << s_int_b.Value(); cout << endl << endl; cout << "enter any value to quit: "; char quit; cin >> quit; return 0; } </code>

thanks. I put the code from csmart.cpp into csmart.h, then removed csmart.cpp from my project. It had errors, but no more of the weird compiler linking stuff.

lol... i can't figure out the rest of these errors... here they are:

C:\Dev-Cpp\projects\smartdata\csmart.h In member function `csmart<T>& csmart<T>::operator=(const csmart<T>&) [with T = int]':
18 C:\Dev-Cpp\projects\smartdata\main.cpp instantiated from here

75 C:\Dev-Cpp\projects\smartdata\csmart.h passing `const csmart<int>' as `this' argument of `T csmart<T>::Value() [with T = int]' discards qualifiers

76 C:\Dev-Cpp\projects\smartdata\csmart.h passing `const csmart<int>' as `this' argument of `int csmart<T>::Valid() [with T = int]' discards qualifiers

i would appreciate somebody helping me finish this off :)

thanks a lot, it finally works!