I am confused. When I use getline() everything works fine. But when I change it to get(), I get an error message stating it was not declared in this scope:
getline(input, nonterm[index2][++index], TERMINATE ); //works fine.
get(input, nonterm[index2][++index], TERMINATE ); //error get not declared in this scope.
The reason I am changing getline() to get() is because I don't want the delimiter discarded. Any help would be great. Thanks.
I was not aware there was such a function as get(). Where did this function come from, and did you include the header for it?
I read it here:
http://www.cplusplus.com/reference/i...tream/get.html
I have these header files:
#include<iostream>
#include<fstream>
#include<string>
getline works perfect except for the fact that I need to keep the delimiter from being discarded.
And did you look at the example on that page? Did you notice how get was called?
When I try to use like this:
input.get( nonterm[index2][++index], TERMINATE )
I get tons of errors. And getline didn't work that way either. It worked as:
getline(input, nonterm[index2][++index], TERMINATE );
I'm guessing, just by names, that nonterm[index2][++index] is the character you want to read into? If you want to use .get on a character, then you cannot use other parameters (it will only read one character, so delimiter doesn't make any sense). If nonterm[index2][++index] is a c-string/char array, then you also need to pass the size.
(The meanings of the parameters are given at the top of the page -- the way you call it has to match one of those five listed.)
Thanks for helping me. nonterm[index2][++index] is a string-array.
I believe I am calling it as: istream& get ( streambuf& sb, char delim );
when I call it as input.get( nonterm[index2][++index], TERMINATE )
even though that was not how getline was called when it worked. Here are my errors. I am not sure what they mean:
prog1.cpp:89: error: no matching function for call to ‘std::basic_istream<char, std::char_traits<char> >::get(std::basic_string<char, std::char_traits<char>, std::allocator<char> >&, const char&)’
/usr/include/c++/4.1.3/istream:272: note: candidates are: typename std::basic_istream<_CharT, _Traits>::int_type std::basic_istream<_CharT, _Traits>::get() [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.1.3/istream:286: note: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::get(_CharT&) [with _CharT = char, _Traits = std::char_traits<char>]
and more.
By string-array, do you mean an array of std::string? You cannot use get to read in a std::string. Even if you mean an array of chars, you cannot pretend an array of chars is a streambuf& -- only stringbuf and stringstream would work there.
nonterm was declared as a double pointer: string** nonterm;
But how could getline work and get not work?
Well, look at getline:
getline is designed to read into a std::string. get is designed to read into a C-style string (array of char) or into a stringstream/stringbuf object.Code:istream& getline ( istream& is, string& str, char delim );
What about using getline() and then appending the terminating character to the string?
or
useand write your own function to read in a line which will include the delimiter.Code:istream& get ( char& c ); // or int get();
example:
Code:istream& get(string& fill, char term){ char c; do { get(c); if(cin.fail()) break; // make sure to properly check for failure fill.append(1, c); }while(c != term); return cin; // I'm not fully sure if this line will work }
If I went the stringstream/stringbuf route would I just declare my string** nonterm as a stringstream** nonterm?
You could. What I would probably do is something like this:Originally Posted by lord
so that you still have strings elsewhere in your code, where you probably want them.Code:std::stringstream temp; input.get(temp, TERMINATE); temp >> nonterm[whatever_it_was][index++];
(Edit: This assumes rather that there aren't spaces in your input, as that would wreak havoc, but if that's a problem you could probably do a getline from temp or something similar.)
There are spaces so I use getline once I get this working. The problem now is I am getting an error stating:
prog1.cpp:95: error: invalid conversion from ‘void*’ to ‘char*’
prog1.cpp:95: error: initializing argument 1 of ‘std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::get(_CharT*, std::streamsize, _CharT) [with _CharT = char, _Traits = std::char_traits<char>]’
