creating vectors for individually parsed sentences c++ - c++

Question

class Read
{
public:
Read(const char* filename)
:mFile(filename)
{
}
void setString()
{
while(getline(mFile, str, '.'))
{
getline(mFile, str, '.');
str.erase(std::remove(str.begin(), str.end(), '\n'), str.end());
}
}
private:
ifstream mFile;
string str;
};
int main()
{
Read r("sample.txt");
return 0;
}
My ultimate goal is to parse through each sentence in the file so I used getline setting the delimiter to '.' to get each individual sentence. I want to create a sentence vector but am not really sure how to do so.
The file is pretty big so it will have a lot of sentences. How do I create a vector for each sentence?
Will it simply be vector < string > str? How will it know the size?
EDIT: I added a line of code to remove the '\n'
EDIT: Got rid of !eof

Answer 1

while(!myFile.eof())
getline(mFile, str, '.');
Where did you find that? Please put it back. Try:
std::vector<std::string> sentences;
while(std::getline(mFile, str, '.'))
sentences.push_back(str);
The vector container has a .size() function to return the number of populated elements. You should google "std::vector" and read through the functions in the API.

Answer 2

Vectors are dynamica arrays. You need not to worry about the size of the vector. You can use push_back() function to add element in the vector. I have made some changes in your code. Please check if this work for you..
#include<vector>
using namespace std;
class Read
{
public:
Read(const char* filename)
:mFile(filename)
{
}
void setString()
{
while(getline(mFile, str, '.'))
{
vec.push_back(str);
}
}
private:
ifstream mFile;
string str;
vector<string> vec;
};
int main()
{
Read r("sample.txt");
return 0;
}

Answer 3

#include <vector>
using namespace std;
...
vector<string> sentences;
sentences.push_back(line);
The vector is a dynamic array and it will resize itself as you keep adding sentences. If you know the number of sentences, you can increase the performance by calling:
sentences.resize(number of sentences here)