get and getline

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:

Code:

---

istream& getline ( istream& is, string& str, char delim );

---

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.

What about using getline() and then appending the terminating character to the string?
or
use

Code:

---

istream& get ( char& c ); // or
int get();

---

and write your own function to read in a line which will include the delimiter.

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?

Quote:

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Originally Posted by lord

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:

Code:

---

std::stringstream temp;
input.get(temp, TERMINATE);
temp >> nonterm[whatever_it_was][index++];

---

so that you still have strings elsewhere in your code, where you probably want them.

(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>]’

tabstop: If I use a getline on temp it seems to me I will be back where I started. I would read into temp until TERMINATE but then that will be discarded.

But there won't be a TERMINATE in temp -- get doesn't read it in but leaves it in the input buffer.

Oh yeah, all these errors are making me dizzy. Do you have any idea what could be causing that error. I noticed that if I changed it to stringbuf the error goes away but it will not let me use
temp >> nonterm[entry][index++];
or
temp = nonterm[entry][index++];

it tells me there is no matching operator.

Quote:

---

Originally Posted by lord

Oh yeah, all these errors are making me dizzy. Do you have any idea what could be causing that error. I noticed that if I changed it to stringbuf the error goes away but it will not let me use
temp >> nonterm[entry][index++];
or
temp = nonterm[entry][index++];

it tells me there is no matching operator.

---

nonterm[entry][index++] = temp.str();