c++ – Converting a vector to string

c++ – Converting a vector to string

I usually do it this way…

#include <string>
#include <vector>

int main( int argc, char* argv[] )
{
    std::vector<char> vec;
    //... do something with vec
    std::string str(vec.begin(), vec.end());
    //... do something with str
    return 0;
}

Maybe std::ostream_iterator and std::ostringstream:

#include <vector>
#include <string>
#include <algorithm>
#include <sstream>
#include <iterator>
#include <iostream>

int main()
{
  std::vector<int> vec;
  vec.push_back(1);
  vec.push_back(4);
  vec.push_back(7);
  vec.push_back(4);
  vec.push_back(9);
  vec.push_back(7);

  std::ostringstream oss;

  if (!vec.empty())
  {
    // Convert all but the last element to avoid a trailing ,
    std::copy(vec.begin(), vec.end()-1,
        std::ostream_iterator<int>(oss, ,));

    // Now add the last element with no delimiter
    oss << vec.back();
  }

  std::cout << oss.str() << std::endl;
}

c++ – Converting a vector to string

Here is an alternative which uses a custom output iterator. This example behaves correctly for the case of an empty list. This example demonstrates how to create a custom output iterator, similar to std::ostream_iterator.

#include <iterator>
#include <vector>
#include <iostream>
#include <sstream>

struct CommaIterator
:
  public std::iterator<std::output_iterator_tag, void, void, void, void>
{
  std::ostream *os;
  std::string comma;
  bool first;

  CommaIterator(std::ostream& os, const std::string& comma)
  :
    os(&os), comma(comma), first(true)
  {
  }

  CommaIterator& operator++() { return *this; }
  CommaIterator& operator++(int) { return *this; }
  CommaIterator& operator*() { return *this; }
  template <class T>
  CommaIterator& operator=(const T& t) {
    if(first)
      first = false;
    else
      *os << comma;
    *os << t;
    return *this;
  }
};

int main () {
  // The vector to convert
  std::vector<int> v(3,3);

  // Convert vector to string
  std::ostringstream oss;
  std::copy(v.begin(), v.end(), CommaIterator(oss, ,));
  std::string result = oss.str();
  const char *c_result = result.c_str();

  // Display the result;
  std::cout << c_result << n;
}

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