c++ initializing Error

Question

I want to declare a class for Coordinates and I try this codes:

Coordinate.h:

typedef unsigned short Short;
class Coordinate
{
private :
  Short _row;
  Short _col;
public:
  Coordinate(Short row, Short col);
  bool operator ==(const Coordinate* other);
};

Coordinate.cpp:

#include "Coordinate.h"

Coordinate::Coordinate(Short row, Short col)
  : _row(row) , _col(col){}

bool Coordinate::operator== (const Coordinate* other)
{
  if (other == NULL || this == NULL)
      return false;
  if (this == other)
      return true;
  if (other->_row != this->_row || other->_col != this->_col)
      return false;
  return true;
}

Main.cpp :

#include "Coordinate.h"
int main()
{
  Coordinate a( 2,2 );
}

But visual studio 2015 returns this errors:

Error C2079 'a' uses undefined class 'Coordinate'
Error C2440 'initializing': cannot convert from 'initializer list' to 'int'

There is no `initializer_list` shown. An `std::initializer_list` is created when you instantiate an object using braced initialization syntax. — Emmanuel Mathi-Amorim, Nov 22 '16 at 02:20
`this == NULL` is true when somebody writes something like ((Coordinate*)NULL) , you can test it @tadman . — John Zeng, Nov 22 '16 at 02:43
@JohnZeng So in other words, when taking the express train to Undefined Behaviour Town. — tadman, Nov 22 '16 at 02:43
[Beware of the underscore prefix.](http://stackoverflow.com/questions/228783/what-are-the-rules-about-using-an-underscore-in-a-c-identifier) — user4581301, Nov 22 '16 at 02:45

score 4 · Answer 1 · answered Nov 22 '16 at 02:23

4

Fix your typo in:

#include "Coordinate.h"
int main()
{
  Coodinate a( 2,2 );
}

Coodinate should be Coordinate.

answered Nov 22 '16 at 02:23

BUCH

103
4

2

@Alireza Can you show us the new compiler output to see the errors? It compiles fine on my system (Had to change NULL to 0 though for some reason). – BUCH Nov 22 '16 at 02:31
1

In C++, you [should be using `nullptr` instead of `NULL`](http://stackoverflow.com/a/13816448/1848578). – qxz Nov 22 '16 at 02:50

score 0 · Answer 2 · answered Nov 22 '16 at 02:24

0

The first error is due to misspelled Coordinate. Might also fix the second one.

answered Nov 22 '16 at 02:24

Henning Koehler

2,456
1
16
20

score 0 · Answer 3 · answered Nov 22 '16 at 02:47

0

Usually undefined means that the compiler can not find the Coordinate.cpp file. Have you checked about your project setting that makes the linker link the Coordinate.cpp file into your execute file?

answered Nov 22 '16 at 02:47

John Zeng

1,174
2
9
22

c++ initializing Error

3 Answers3