Question

I am running a C++ program which uses a class from another .cpp file. The class only has a constructor. It works when I test it separately. The main program compiles,but when I run it, I have a bug in the constructor. Any one can think of any situation that could happen? Thanks.

I guess I just run the code in terminal, and it is fine. But when I try to build a project in eclipse, it shows following code has multiple definition error:

class model
{
  public:
    int textures [];
    float vertices[][3];
    float triangles[][13];
  public:
    model(const char*); // constructor
};

model::model(const char* filename)
{

error message is: multiple definition of `model::model(char const*)’

any idea?

Answer 1

You need to split your code into a .h (header) and a.cpp (implementation) file and put:

model::model(const char* filename)
{

in the latter. Or, rewrite your class so the definition of the constructor (and any other member functions) is inside the class in the header file:

class model {
   ...
   model(const char*) {
     // constructor body here
   }
};