[Dev-C++] RE: Help me in deciphering complier error...

[Graeme F. <gr...@dr...>]

I think that you have a problem with line 36:
36  StatArray myArray();  /* constructor */

If you are intending to create an object called myArray of class StatArray
then that will not work. The compiler will in fact declare (but not define)
a function called myArray with no parameters but with a return type of
StatArray. The line should be changed to:

36  StatArray myArray;  /* constructor */

No parenthesis. This is one of those strange cases, if the constructor
doesn't expect any parameters than omit the parenthesis.

To get the nested included to work you either need to include a
pre-processor directive or exclude the #include and declare the class
extern. The pre-processor directive is probably better here, and a good
habit to get into: so wrap each header file with the following type of code

#ifndef __STATARRAY_HPP
#define __STATARRAY_HPP
// put you class declaration
// and inline functions here
#endif

Essentially the first time in this creates a pre-processor variable called
__STATARRAY_HPP (use  __DYNARRAY_HPP for your other file) the next time in
because the variable exists it doesn't declare the class (jumping directly
to the #endif directive) and thus it will avoid declaring the class a second
time.

I hope this helps.


--__--__--

Message: 2
From: "Daniel Anderson" <bt...@ca...>
To: <dev...@li...>
Date: Thu, 4 Apr 2002 20:21:22 -0500
Subject: [Dev-C++] Help me in deciphering complier error...

Hello coders,
I have run into a problem with a program I am writing.  I have a parent
class, DynArray, that StatArray is derived from.  dynarray.cpp is in one
file, statarray.cpp is in another.  My main program has an #include
"statarray.cpp" statement, and statarray.cpp in turn #include's
"dynarray.cpp".  When attempting to compile the program, I get the following
errors.  I am guessing this type of error indicates that I might be mixing
types, but I can't figure out where and what I need to correct.  Any help is
appreciated.  Thanks!
Danny

main.cpp: In function `int main()':
main.cpp:38: conversion from `StatArray (*)()' to non-scalar type
`StatArray' requested
main.cpp:14: in passing argument 1 of `GetArray(StatArray &, ifstream &)'
main.cpp:40: conversion from `StatArray (*)()' to non-scalar type
`StatArray' requested
main.cpp:15: in passing argument 1 of `PrintArray(const StatArray &,
ofstream &)'


/* code fragment here: */

14  void GetArray(StatArray&, ifstream&);
15  void PrintArray(const StatArray&, ofstream&);
...
36  StatArray myArray();  /* constructor */

38  GetArray(myArray, inData);

40  PrintArray(myArray, outData);

/* func definitions empty */
void GetArray(StatArray& targetArray,  ifstream& inData)
  {}
void PrintArray(const StatArray& sourceArray, ofstream& outData)
  { }