Question: Help using ' istream& getline (istream& is, string& str, char
delim = '\n'); '
First of all, I apologize I am addressing this question to the wrong
mail_list/news_group. If so, please just disregard this message.
Here is my problem:
The below overloaded extractor is not the only one in my class. There is
an overloaded extractor for all the primitive data types as well as for
std::string objects.
All of inserters and extractors handling primitive data types are
identical, the only difference is that each handles different data
types. However, the overloaded operator handling std::string objects is
giving me some strange behavior.
Staring with the data in the file stream and continuing with a sip of
the source code, let me show you what it is that I am talking about.
-- data in the file stream is: --
Where are the weapons of mass destruction? Sir.^
-- snip --
virtual std::string& operator>>(std::string& data)
throw(jme::CursorPosition, jme::StreamEx, std::bad_alloc){
/** Set the position of the file get pointer, if there are any
errors throw an exception explaining what when wrong **/
try{setNextRead();}
catch(jme::CursorPositionEx& x){throw; }
catch(jme::StreamEx& x) {throw; }
/** Make sure that there is data to be read in the file**/
if(file_is_empty()){ throw io_baseEx(FE_EMPTY,FILE,METHOD,LINE);}
/** set the file's cursor position the the value returned by
getNextRead(), which will never be < zero **/
f.seekg( getNextRead());
/** Get the a string from of character from the file stream until "^"
is found **/
std::getline(f,data,'^')
//Testing
std::cout << "Data is: " << data << std::endl; <<== Displays the right
string value
std::cout << "Current Cursor Pos " << f.tellg() << std::endl; //<==
Returns -1; an error??
std::cin.get();
//End testing
try{setNextRead();}
catch(jme::CursorPosition& x){ throw; }
catch(jme::StreamEx& x){throw; } <== because ftellg is -1 this
exception is thrown
f.sync();
return data;
}
Again, thanks folks for the help!
--
Jorge Escalante
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