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Leszek Tumm
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 Posted: Wed Dec 22, 2004 8:53 am Post subject: problem with private member... |
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Hi.
Can you help solve a problem with operator overloading ?
in one file i have definition of my class and declarations of overloaded
operators:
class Complex
{
long double Re;
long double Im;
public:
friend const Complex operator+ (const Complex &, const Complex &);
//..//
};
Second file contains definition of operator+ :
const Complex operator+ (const Complex & x, const Complex & y)
{
return Complex(x.Re + y.Re, x.Im + y.Im);
}
I don't know why but i'm getting these error messages:
complex.h: In function `const Cmpl::Complex operator+(const Cmpl::Complex&,
const Cmpl::Complex&)':
complex.h:20: `long double Cmpl::Complex::Re' is private
complex.cpp:34: within this context
complex.h:20: `long double Cmpl::Complex::Re' is private
complex.cpp:34: within this context
complex.h:21: `long double Cmpl::Complex::Im' is private
complex.cpp:34: within this context
complex.h:21: `long double Cmpl::Complex::Im' is private
complex.cpp:34: within this context
line 34 is:
return Complex(x.Re + y.Re, x.Im + y.Im);
What is the reason of this error? What should I do to make it
compile properly??
Thanks.
Leszek
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Antoun Kanawati
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| Posted: Thu Dec 23, 2004 3:30 pm Post subject: Re: problem with private member... |
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Leszek Tumm wrote:
| Quote: | Hi.
Can you help solve a problem with operator overloading ?
in one file i have definition of my class and declarations of overloaded
operators:
class Complex
{
long double Re;
long double Im;
public:
friend const Complex operator+ (const Complex &, const Complex &);
//..//
};
Second file contains definition of operator+ :
const Complex operator+ (const Complex & x, const Complex & y)
{
return Complex(x.Re + y.Re, x.Im + y.Im);
}
I don't know why but i'm getting these error messages:
complex.h: In function `const Cmpl::Complex operator+(const Cmpl::Complex&,
const Cmpl::Complex&)':
complex.h:20: `long double Cmpl::Complex::Re' is private
complex.cpp:34: within this context
complex.h:20: `long double Cmpl::Complex::Re' is private
complex.cpp:34: within this context
complex.h:21: `long double Cmpl::Complex::Im' is private
complex.cpp:34: within this context
complex.h:21: `long double Cmpl::Complex::Im' is private
complex.cpp:34: within this context
line 34 is:
return Complex(x.Re + y.Re, x.Im + y.Im);
What is the reason of this error? What should I do to make it
compile properly??
|
The error message says it (if you read very carefully): notice
the 'Cmpl::' prefix on the class name, but not on operator+.
You probably wanted to say something like:
friend Complex ::operator+(....)
--
A. Kanawati
[email]NO.antounk.SPAM (AT) comcast (DOT) net[/email]
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L.Suresh
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| Posted: Thu Dec 23, 2004 5:07 pm Post subject: Re: problem with private member... |
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Your constructor for Complex is missing :)
--lsu
class Complex
{
long double Re;
long double Im;
friend const Complex operator+ (const Complex &, const Complex &);
public:
Complex(double re, double im) : Re(re), Im(im) {}
};
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Bo Persson
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| Posted: Thu Dec 23, 2004 9:10 pm Post subject: Re: problem with private member... |
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"Leszek Tumm" <leszekt80 (AT) poczta (DOT) onet.pl> skrev i meddelandet
news:pan.2004.12.22.03.36.17.562076 (AT) poczta (DOT) onet.pl...
| Quote: | Hi.
Can you help solve a problem with operator overloading ?
in one file i have definition of my class and declarations of
overloaded
operators:
class Complex
{
long double Re;
long double Im;
public:
friend const Complex operator+ (const Complex &, const Complex &);
//..//
};
Second file contains definition of operator+ :
const Complex operator+ (const Complex & x, const Complex & y)
{
return Complex(x.Re + y.Re, x.Im + y.Im);
}
I don't know why but i'm getting these error messages:
complex.h: In function `const Cmpl::Complex operator+(const
Cmpl::Complex&,
const Cmpl::Complex&)':
complex.h:20: `long double Cmpl::Complex::Re' is private
complex.cpp:34: within this context
complex.h:20: `long double Cmpl::Complex::Re' is private
complex.cpp:34: within this context
complex.h:21: `long double Cmpl::Complex::Im' is private
complex.cpp:34: within this context
complex.h:21: `long double Cmpl::Complex::Im' is private
complex.cpp:34: within this context
line 34 is:
return Complex(x.Re + y.Re, x.Im + y.Im);
What is the reason of this error? What should I do to make it
compile properly??
|
Is the operator+() defined within the namespace Cmpl?
Bo Persson
[ See http://www.gotw.ca/resources/clcm.htm for info about ]
[ comp.lang.c++.moderated. First time posters: Do this! ]
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Paavo Helde
Guest
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| Posted: Thu Dec 23, 2004 9:12 pm Post subject: Re: problem with private member... |
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"Leszek Tumm" <leszekt80 (AT) poczta (DOT) onet.pl> wrote in
news:pan.2004.12.22.03.36.17.562076 (AT) poczta (DOT) onet.pl:
| Quote: | Hi.
Can you help solve a problem with operator overloading ?
in one file i have definition of my class and declarations of
overloaded operators:
class Complex
{
long double Re;
long double Im;
public:
friend const Complex operator+ (const Complex &, const Complex &);
//..//
};
Second file contains definition of operator+ :
const Complex operator+ (const Complex & x, const Complex & y)
{
return Complex(x.Re + y.Re, x.Im + y.Im);
}
I don't know why but i'm getting these error messages:
complex.h: In function `const Cmpl::Complex operator+(const
Cmpl::Complex&,
const Cmpl::Complex&)':
complex.h:20: `long double Cmpl::Complex::Re' is private
complex.cpp:34: within this context
|
My crystal ball says that you have encapsulated your .h file in namespace
Cmpl {...}, but only said 'using namespace Cmpl;' in the .cpp file.
Therefore the operator+ defined there is considered to be in the global
namespace and not the one you declared a friend. Try:
const Complex Cmpl::operator+ (const Complex & x, const Complex & y)
{
return Complex(x.Re + y.Re, x.Im + y.Im);
}
or encapsulate the .cpp also in the namespace (most suggested if you use
free functions).
Regards
Paavo
[ See http://www.gotw.ca/resources/clcm.htm for info about ]
[ comp.lang.c++.moderated. First time posters: Do this! ]
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