C++: compiler returns an error, can't figure out why

frankie_DJ · 10-16-2005, 06:52 AM

Hi everyone,

I need some help with the following C++ code. It is supposed to read input line by line, each line as one string; then split each string into its component words and store these components in a vector<string> (so it would be a vector of strings per line)
('Split' function mentioned in the code is defined elsewhere and it workes fine; it splits a line of input into words and stores them in vector<string>.)

Code:

#include <iostream>
#include <string>
#include <vector>
#include "split.h"
//using declarations



 struct split_phrase
        {
                vector<string> words;
        };

int main()
{
        string s;
        vector<string> phrase;
        vector<split_phrase> sp;

        while (getline(cin,s))
                phrase.push_back(s);
        for (vector<string>::size_type i=0;
                             i!=phrase.size(); ++i)
ERROR HERE!   (sp.words).push_back(split(phrase[i])); 

        cout<<sp[2].words[3];
        return 0;
}

Below is the only error returned. I don't understand why it shows. ANy thougths?

Code:

5-1.cc: In function `int main()':
5-1.cc:45: error: 'class std::vector<split_phrase, 
std::allocator<split_phrase> 
 >' has no member named 'words'

llama_meme · 10-16-2005, 08:34 AM

sp is a vector, and vectors don't have a "words" member.

Alex

frankie_DJ · 10-16-2005, 08:41 AM

Alex,

Can you be more specific? I have vector of type split_phrase. I thought that each of split_phrase objects in a vector has a member words. What am I missing?

llama_meme · 10-16-2005, 08:43 AM

On the line with the error, you're not accessing a member of the 'sp' vector, you're just accessing the 'sp' vector (which itself has no 'words' member). Did you perhaps forget to index the vector before accessing the 'words' member?

frankie_DJ · 10-16-2005, 08:55 AM

I am sure you are right, but I am still not seeing it. If I am using push_back(), why do I neeed index?

llama_meme · 10-16-2005, 09:08 AM

The problem is with

Code:

sp.words

sp is a vector, and it doesn't have a words member. Elements of sp do have a words member, so maybe you meant to index the vector and access the words member of one of its elements?

Alex

frankie_DJ · 10-16-2005, 09:15 AM

OK. I see it. Indexing sp will not work however. I have to start from scratch, this approach is a dead end.