C ++在重载函数中使用“基本”函数

Question

while coding I came across a problem.

I use projective 2D-Space (ie 2D-points (x,y) and 3D-Points (x,y,w) ). I also have a function taking in a projectiv point (3D). For better reading and to avoid casting in the main I tried to write an overload for that function taking in the 2D-Point and calling the "base" function (simple example). But the compiler does not compiles the code. There seems to be a link error (LNK 2001).

//"base" function
foo(3D_pt pt)
{
      //do something with it
}

//overloaded function
foo(2D_pt pt)
     3D_pt pt3 = 3D_pt(pt.x, pt.y, 1);
     foo(pt3);
}

Any ideas how to go about that?

Thanks

edit: The error is: LNK2001: unresolved symbol - foo(2D_pt pt)

Answer 1

The only problem in the code posted are:

#1: Your class names ( 2D_pt and 3D_pt ) are starting with a number while an identifier in C++ should not do this ( Cplusplus.com ).

#2: The functions foo have no return type.

#3: { is missing in foo(2D_pt) .

After fixing, everything builds with no issues: ideone .