Hello
I've been working with boost iostreams filters.
Since when I changed
fin.push(file_source("outest.fil", ios::in | ios::binary));
to:
file_source fss("outest.fil", ios::in | ios::binary);
fin.push(boost::ref(fss));
file crashes when the task is done.
Why is that happening? What am I doing wrong? I think it has something to do
with memory allocation..
Another thing im unsure about:
Should I open file each time I want to read from it, or can I open it at
program start, and leave it open (program will be running for a long period)
?
I hope someone responds this time
Thanks for help
Best regards
#include
#include
#include
#include
#include <exception>
#include <fstream>
#include <ostream>
#include <iostream>
#include <string>
#include <vector>
using namespace std;
using namespace boost::iostreams;
namespace io = boost::iostreams;
class long_line_counter : public boost::iostreams::line_filter {
public:
explicit long_line_counter(int max_length = 80)
: max_(max_length), count_(0) { }
int count() const { return count_; }
vector<string> mail_list;
private:
std::string do_filter(const std::string& line) {
if (line.size() < max_) mail_list.push_back(line);
++count_;
return line;
}
int max_;
int count_;
};
int main() {
try {
filtering_istream fin;
long_line_counter llc(80);
file_source fss("outest.fil", ios::in | ios::binary);
fin.push(boost::ref(llc));
fin.push(boost::ref(fss));
char buf[4012];
while ( fin.read(buf, 4012) ) {
}
std::cout << llc.count() << "\n";
std::cout << llc.mail_list.size() << "\n";
}
catch (exception &e) {
cout << "exception: " << e.what() << std::endl;
}
return 0;
}
