Call of overloaded function(int, int) is ambiguous.

[wtf]

I don't understand why I am getting this error. It was working fine until I overloaded it, by adding a new function with a third parameter.

now the function with 3 parameters works, but the one with only 2 gives me this error.

How can it be ambiguous when its got different amount of parameters???

[Athar]

Well, you should post the two function declarations.
The compiler should also give you more detailed information about why it is ambiguous.

[wtf]

Why is this:

    inline matrix( unsigned rows = 0, unsigned cols = 0):
      myRows(rows),
      myCols(cols)
      //data  ( (rows && cols) ? (new value_type[ nrows * ncols ]) : NULL )
      {myRows = rows; myCols = cols;  }

    inline matrix(unsigned rows = 0, unsigned cols = 0, int fillValue)
//etc etc 

won't compile but this will:

inline matrix( unsigned rows, unsigned cols, int fillValue)
//etc etc  

[Disch]

Once you have a default value for a parameter... all parameters that follow it must also have default values.

Think about it... how would you call this ctor and use those default values: inline matrix(unsigned rows = 0, unsigned cols = 0, int fillValue)

matrix(5);  // the '5' is the first param, so compiler thinks it's for your rows
  // error because there's no value for 'fillValue'

matrix(5,3);  // again... this just specifies rows/cols.  No value for fillValue
  // still an error

matrix(5,3,2);  // this will work, but you're not using any of the default values, so they're useless 

[jsmith]

And you're going to end up with ambiguous calls no matter what if you make fillValue have a default value because
both

matrix m( 5 );
matrix m2( 5, 6 );

won't know which of the two constructors to call.

Best solution:

matrix() : myRows(), myCols() {}

matrix( unsigned rows, unsigned cols, int fillValue = 0 ) :
    myRows( rows ), myCols( cols ) { /* etc */ }