charconv.hpp

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#pragma once
 
#include <charconv>
#include <limits>
#include <stdexcept>
#include <string>
#include <string_view>
 
#include "result.hpp"
 
namespace bricks {
 
template <typename T>
auto to_string(const T& value,
               std::size_t buffer_size = (std::numeric_limits<T>::digits10 + 2)) noexcept
    -> result<std::string, std::errc>
{
  std::string str(buffer_size, '\0');
  auto [ptr, ec] = std::to_chars(str.data(), str.data() + str.size(), value);
 
  if (ec != std::errc()) {
    return ec;
  }
 
  str.resize(std::distance(str.data(), ptr));
  return str;
}
 
template <typename T>
auto from_string(const std::string_view& str) noexcept -> result<T, std::errc>
{
  T value;
  auto [ptr, ec] = std::from_chars(str.data(), str.data() + str.size(), value);
 
  if (ec != std::errc()) {
    return ec;
  }
 
  if (ptr != str.data() + str.size()) {
    return std::errc::invalid_argument;
  }
 
  return value;
}
 
}  // namespace bricks