#include <iostream>
#include <vector>
#include <iterator>
#include <string>
#include <algorithm>
class line {
     std::string data;
 public:
     friend std::istream& operator>>(std::istream &is, line &l)
     {
         return std::getline(is, l.data);
     }
     operator std::string() const { return data; }
};
 
int main()
{
     std::vector<std::string> lines;
     std::copy(
         std::istream_iterator<line>(std::cin),
         std::istream_iterator<line>(),
         std::back_inserter(lines));
     std::cout << "there were " << lines.size() << " lines of input\n";
}
 

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Here is some text
with spaces
and multiple lines.