i am getting errors in C++

[srikar]

When the below function was run on linux64 bit machine in C++
i am getting the following problems.

void real_rec::dump(ostream& s, const int indent ) const
{

s << "real = ";
long f = cout.flags();
s.setf( ios::fixed );
s.precision( 2 );
s << value << "\n";
s.flags(f);

}
when i am using this function in my code i am getting this type of errors, when this function was ran on 16 bit machine I didnt had any problem

the corresponding errors are
common.cxx:1079: no matching function for call to `std::basic_ostream<char,
std::char_traits<char> >::flags(long int&)'
/usr/include/c++/3.2.3/bits/ios_base.h:333: candidates are: std::_Ios_Fmtflags
std::ios_base::flags() const
/usr/include/c++/3.2.3/bits/ios_base.h:337: std::_Ios_Fmtflags
std::ios_base::flags(std::_Ios_Fmtflags)

Please helpme to resolve this problem.

[Banfa]

common.cxx:1079: no matching function for call to `std::basic_ostream<char,
std::char_traits<char> >::flags(long int&)'

This error refers to the line s.flags(f); the function prototype given is what would be require to make this call. flags() does not have this prototype it has the prototypes given in the following 2 messages.

/usr/include/c++/3.2.3/bits/ios_base.h:333: candidates are: std::_Ios_Fmtflags
std::ios_base::flags() const

/usr/include/c++/3.2.3/bits/ios_base.h:337: std::_Ios_Fmtflags
std::ios_base::flags(std::_Ios_Fmtflags)


The problem is that you have declared f as

long f;

when it should be

std::_Ios_Fmtflags f;

or according to my documentation

ios_base::fmtflags f;

within namespace std

[srikar]

common.cxx:1079: no matching function for call to `std::basic_ostream<char,
std::char_traits<char> >::flags(long int&)'

This error refers to the line s.flags(f); the function prototype given is what would be require to make this call. flags() does not have this prototype it has the prototypes given in the following 2 messages.

/usr/include/c++/3.2.3/bits/ios_base.h:333: candidates are: std::_Ios_Fmtflags
std::ios_base::flags() const

/usr/include/c++/3.2.3/bits/ios_base.h:337: std::_Ios_Fmtflags
std::ios_base::flags(std::_Ios_Fmtflags)


The problem is that you have declared f as

long f;

when it should be

std::_Ios_Fmtflags f;

or according to my documentation

ios_base::fmtflags f;

within namespace std

Thank you Banfa my problem got solved by declaring f as std::_Ios_Fmtflags

Banfa I didnot understand some questions like

1) What does s.flags(f) function represent, what is the need of this function?

2) what is the use of the flags std::_Ios_Fmtflags and std::Ios_base ::flags

what does this flags represent,

3) What is the relation of these flags with basic io streams.

banfa help me to resolve my queries.

Once again Thank you banfa for your replies to my queries.

[rbottone]

When the below function was run on linux64 bit machine in C++
i am getting the following problems.

void real_rec::dump(ostream& s, const int indent ) const
{

s << "real = ";
long f = cout.flags();
s.setf( ios::fixed );
s.precision( 2 );
s << value << "\n";
s.flags(f);

}
when i am using this function in my code i am getting this type of errors, when this function was ran on 16 bit machine I didnt had any problem

the corresponding errors are
common.cxx:1079: no matching function for call to `std::basic_ostream<char,
std::char_traits<char> >::flags(long int&)'
/usr/include/c++/3.2.3/bits/ios_base.h:333: candidates are: std::_Ios_Fmtflags
std::ios_base::flags() const
/usr/include/c++/3.2.3/bits/ios_base.h:337: std::_Ios_Fmtflags
std::ios_base::flags(std::_Ios_Fmtflags)

Please helpme to resolve this problem.

try defining f as follows:

std::ios::fmtflags f = cout.flags();

This should fix your compile problem

[srikar]

Thanks 4 d reply, I got resolved my problem,

But I didnt clear the above mentioned questions.

Can u explain me

[Banfa]

1) What does s.flags(f) function represent, what is the need of this function?

2) what is the use of the flags std::_Ios_Fmtflags and std::Ios_base ::flags

what does this flags represent,

3) What is the relation of these flags with basic io streams.

1. It allows you to set and retrieve the format flags for the stream, you code appears to be copying format flags from 1 stream to another.

2. This is very common, they are actually types. Many classes (particularly the standard ones) typedef there own variables std::Ios_base::flags is the type used to store the format flags and is used as the parameter type and return type for the function flags()

3. These flags hold the formating to be used when inputing or outputing data, for instance fixed precision or fixed width

[srikar]

1. It allows you to set and retrieve the format flags for the stream, you code appears to be copying format flags from 1 stream to another.

2. This is very common, they are actually types. Many classes (particularly the standard ones) typedef there own variables std::Ios_base::flags is the type used to store the format flags and is used as the parameter type and return type for the function flags()

3. These flags hold the formating to be used when inputing or outputing data, for instance fixed precision or fixed width

Hi Banfa Thank u much,

I am happy for the fast reply, I got understood the probelm.

regards

srikar