//
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// Lab. Calcolo II - Esempio di codice
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// <![CDATA[
// Example code: STL-based sort of data that may come from stdin.
// (francesco.prelz@mi.infn.it 20060810)
#include <iostream>
#include <iomanip>
#include <string>
#include <fstream>
#include <sstream>
#include <vector>
#include <algorithm>
#include <system_error>
#include <cerrno>
#include "measurement.h"
int main(int argc, char *argv[])
{
typedef measurement<double> measurement_t;
typedef std::vector<measurement_t> measurement_container_t;
measurement_container_t measurements;
std::ifstream fread;
std::istream *input=&fread; // A reference variable would do here
if (argc > 1)
{
fread.open(argv[1],std::ios::in);
if (!fread)
{
std::cerr << argv[0] << ": Error: Cannot read from " << argv[1]
<< ": "
<< std::system_error(errno, std::system_category()).what()
<< "." << std::endl;
return 1;
}
}
else input = &std::cin; // But std::cin already exists and is made
// 'noncopyable' via a private operator=
while (input->good())
{
measurement_t meas;
*input >> meas;
if (input->good()) measurements.push_back(meas);
}
std::cout << "Successfully read " << measurements.size() << " elements."
<< std::endl;
// Implicit template instantiation is playing here as well.
sort(measurements.begin(), measurements.end());
// No way to get a const_iterator out of 'auto', but we can survive here.
for(auto it=measurements.begin();
it!=measurements.end(); ++it)
std::cout << *it << std::endl; // An iterator "behaves as" a pointer!
return 0;
}
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