Hi can any one expalin me this piece of code

[srikar]

Hi can any one expalin me this piece of code
In this code line is used for taking the input stream as line input stream.
Please explain me Can I use getline() instead of line.
When I am using the above code I am fetting errors like
line undeclared.

Please help me to resolve my problem


void get_name_token ( strstream &line, ostrstream & output )
{
// Set line stream for input operations.

line.setf(ios:: in);

// "Stop" is the char that immediately follows an extracted token
// part in the input stream. If "Stop" is a tab, newline, or EOF
// character, it indicates the end of a token. I give "Stop" an
// arbitrary initial value that is definitely not a delimiter.

char Stop = 'a';

// Eat leading white space and check "Stop" for end of token.
// Quit loop when "Stop" signals the end of a token.

while ( line >> ws , (Stop != '\t' && Stop != '\n' && Stop != EOF ))
{
line.get ( *output.rdbuf() , ' ' ); // get next token part.

Stop = (char)line.peek (); // Check next char for end of token

if ( Stop == ' ' )
{
// Might be end of token or just an embedded space.
// get the "Stop" character to advance the streambuf ptr.

line.get ( Stop );

// If the next character is a space then its the end of the
// token, so we set Stop to EOF to break the while loop.

if ( line.peek() == ' ' )
{
Stop = EOF;
}
else
{
output << Stop;
}
}
}
output << ends;
}



vendor_map_tb_t init_vendor_tab le( char* vendor_file_nam e )
{
ifstream vendor_instream ( vendor_file_nam e );

if ( vendor_instream )
{
// Allocate the vendor_table;

vendor_map_tb_t vendor_table = new gtb(string_t, vendor_map_t)( &stringless, &stringequal s );

// eat initial leading blank lines and whitespaces, then
// check for EOF. Loop until the file is empty.

while ( vendor_instream >> ws, !vendor_instrea m.eof() )
{
// Declare "line" stream and set it for output operations.

strstream line;
line.setf(ios:: out);

// Get a line from the vendor file stream.

vendor_instream .get ( *line.rdbuf(), '\n' );
line << ends;

if ( line.peek() == EOF || line.peek() == '#' )
{
// The line is blank or a comment, so ignore it and start
// again with the next line.

line.clear ();
vendor_instream >> ws;
}
else
{
int count = 0;
ostrstream names[3];

// Get three tokens from the line.

while ( count < 3 ) get_name_token ( line, names[count++] );

// Ignore the rest of the line. This allows us to extend the
// the number of tokens on a line in some future release without
// breaking a translator that expects three tokens on the line.

line.clear();

[r035198x]

Hi can any one expalin me this piece of code
In this code line is used for taking the input stream as line input stream.
Please explain me Can I use getline() instead of line.
When I am using the above code I am fetting errors like
line undeclared.

Please help me to resolve my problem


void get_name_token ( strstream &line, ostrstream & output )
{
// Set line stream for input operations.

line.setf(ios:: in);

// "Stop" is the char that immediately follows an extracted token
// part in the input stream. If "Stop" is a tab, newline, or EOF
// character, it indicates the end of a token. I give "Stop" an
// arbitrary initial value that is definitely not a delimiter.

char Stop = 'a';

// Eat leading white space and check "Stop" for end of token.
// Quit loop when "Stop" signals the end of a token.

while ( line >> ws , (Stop != '\t' && Stop != '\n' && Stop != EOF ))
{
line.get ( *output.rdbuf() , ' ' ); // get next token part.

Stop = (char)line.peek (); // Check next char for end of token

if ( Stop == ' ' )
{
// Might be end of token or just an embedded space.
// get the "Stop" character to advance the streambuf ptr.

line.get ( Stop );

// If the next character is a space then its the end of the
// token, so we set Stop to EOF to break the while loop.

if ( line.peek() == ' ' )
{
Stop = EOF;
}
else
{
output << Stop;
}
}
}
output << ends;
}



vendor_map_tb_t init_vendor_tab le( char* vendor_file_nam e )
{
ifstream vendor_instream ( vendor_file_nam e );

if ( vendor_instream )
{
// Allocate the vendor_table;

vendor_map_tb_t vendor_table = new gtb(string_t, vendor_map_t)( &stringless, &stringequal s );

// eat initial leading blank lines and whitespaces, then
// check for EOF. Loop until the file is empty.

while ( vendor_instream >> ws, !vendor_instrea m.eof() )
{
// Declare "line" stream and set it for output operations.

strstream line;
line.setf(ios:: out);

// Get a line from the vendor file stream.

vendor_instream .get ( *line.rdbuf(), '\n' );
line << ends;

if ( line.peek() == EOF || line.peek() == '#' )
{
// The line is blank or a comment, so ignore it and start
// again with the next line.

line.clear ();
vendor_instream >> ws;
}
else
{
int count = 0;
ostrstream names[3];

// Get three tokens from the line.

while ( count < 3 ) get_name_token ( line, names[count++] );

// Ignore the rest of the line. This allows us to extend the
// the number of tokens on a line in some future release without
// breaking a translator that expects three tokens on the line.

line.clear();

If you post the code using code tags, it will be easier to read it

[srikar]

Hi when I am using this code in my program I am getting the following errors

these are the errors
doc.cxx:35: no type named `_Ios_Fmtflags' in `class std::ios_base'
doc.cxx: In function `vendor_map_ttb string_t* init_vendor_tab le(char*)':
doc.cxx:98: no matching function for call to `std::strstream ::setf(const
std::_Ios_Openm ode&)'
/usr/include/c++/3.2.3/bits/ios_base.h:345: candidates are: std::_Ios_Fmtfl ags
std::ios_base:: setf(std::_Ios_ Fmtflags)
/usr/include/c++/3.2.3/bits/ios_base.h:353: std::_Ios_Fmtfl ags
std::ios_base:: setf(std::_Ios_ Fmtflags, std::_Ios_Fmtfl ags)
doc.cxx:102: no matching function for call to `std::basic_ifs tream<char,
std::char_trait s<char> >::getline(std: :strstreambuf&, char)'
/usr/include/c++/3.2.3/bits/istream.tcc:664 : candidates are:
std::basic_istr eam<_CharT, _Traits>& std::basic_istr eam<_CharT,
_Traits>::getli ne(_CharT*, long int, _CharT) [with _CharT = char, _Traits =
std::char_trait s<char>]
/usr/include/c++/3.2.3/istream:176: std::basic_istr eam<_CharT,
_Traits>& std::basic_istr eam<_CharT, _Traits>::getli ne(_CharT*, long int)
[with _CharT = char, _Traits = std::char_trait s<char>]

this is the code

void get_name_token ( strstream &line, ostrstream & output )
{ //chaitan s->line
// Set line stream for input operations.

//_Ios_Fmtflags f;
ios_base::_Ios_ Fmtflags::line. setf(ios::in);

// "Stop" is the char that immediately follows an extracted token
// part in the input stream. If "Stop" is a tab, newline, or EOF
// character, it indicates the end of a token. I give "Stop" an
// arbitrary initial value that is definitely not a delimiter.

char Stop = 'a';

// Eat leading white space and check "Stop" for end of token.
// Quit loop when "Stop" signals the enàd of a token.

while ( line >> ws , (Stop != '\t' && Stop != '\n' && Stop != EOF ))
{
line.get( *output.rdbuf() , ' ' ); // get next token part.

Stop = (char)line.peek (); // Check next char for end of token

if ( Stop == ' ' )
{
// Might be end of token or just an embedded space.
// get the "Stop" character to advance the streambuf ptr.

line.get( Stop );

// If the next character is a space then its the end of the
// token, so we set Stop to EOF to break the while loop.

if ( line.peek() == ' ' )
{
Stop = EOF;
}
else
{
output << Stop;
}
}
}
output << ends;
}



vendor_map_tb_t init_vendor_tab le( char* vendor_file_nam e )
{
ifstream vendor_instream ( vendor_file_nam e );

if ( vendor_instream )
{
// Allocate the vendor_table;

vendor_map_tb_t vendor_table = new gtb(string_t, vendor_map_t)( &stringless, &stringequal s );

// eat initial leading blank lines and whitespaces, then
// check for EOF. Loop until the file is empty.

while ( vendor_instream >> ws, !vendor_instrea m.eof() )
{
// Declare "line" stream and set it for output operations.

// _Ios_Fmtflags f; //chaitan added declaration

strstream line;
line.setf(ios:: out); //chaitan ios->ios_base ios::out

// Get a line from the vendor file stream.

vendor_instream .getline( *line.rdbuf(), '\n' );
line << ends;

if ( line.peek() == EOF || line.peek() == '#' )
{
// The line is blank or a comment, so ignore it and start
// again with the next line.

line.clear ();
vendor_instream >> ws;
}
else
{
int count = 0;
ostrstream names[3];

// Get three tokens from the line.

while ( count < 3 ) get_name_token ( line, names[count++] );

// Ignore the rest of the line. This allows us to extend the
// the number of tokens on a line in some future release without
// breaking a translator that expects three tokens on the line.

line.clear();


suggest me the modifications that should be made in this code

Thank you in advance

regards

srikar