io_utils.h

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/*
 * Copyright 2015-2020 CNRS-UM LIRMM, CNRS-AIST JRL
 */
 
#pragma once
#include <algorithm>
#include <functional>
#include <limits>
#include <sstream>
#include <string>
 
namespace mc_rtc
{
namespace io
{
 
template<typename Container,
         typename std::enable_if<!std::is_arithmetic<typename Container::value_type>::value, int>::type = 0>
std::string to_string(const Container & c, const std::string & delimiter = ", ")
{
  if(c.cbegin() == c.cend()) { return ""; }
  std::string out = *c.cbegin();
  for(auto it = std::next(c.cbegin()); it != c.cend(); ++it)
  {
    out += delimiter;
    out += *it;
  }
  return out;
}
 
template<typename Container,
         typename std::enable_if<std::is_arithmetic<typename Container::value_type>::value, int>::type = 0>
std::string to_string(const Container & c,
                      const std::string & delimiter = ", ",
                      const unsigned precision = std::numeric_limits<typename Container::value_type>::digits10)
{
  if(c.cbegin() == c.cend()) { return ""; }
  std::ostringstream out;
  out.precision(precision);
  out << std::fixed << *c.cbegin();
  for(auto it = std::next(c.cbegin()); it != c.cend(); ++it)
  {
    out << delimiter;
    out << std::fixed << *it;
  }
  return out.str();
}
 
template<typename Container,
         typename Callback,
         typename std::enable_if<!std::is_convertible<Callback, std::string>::value, int>::type = 0>
std::string to_string(const Container & c, Callback && get_value, const std::string & delimiter = ", ")
{
  if(c.cbegin() == c.cend()) { return ""; }
  std::string out = get_value(*c.cbegin());
  for(auto it = std::next(c.cbegin()); it != c.cend(); ++it)
  {
    out += delimiter;
    out += get_value(*it);
  }
  return out;
}
 
} // namespace io
} // namespace mc_rtc