44、C++ 国际化编程：从字符集到 Unicode

C++ 国际化编程：从字符集到 Unicode

1. 字符计数与排序

1.1 字符计数程序

以下是一个用于统计输入单词出现次数的程序：

void print_pair(count_pair const& pair, str_size longest)
{
  int constexpr count_size{10}; // Number of places for printing the count
  std::cout << std::format("{0:{1}} {2:{3}}\n", pair.first, longest, pair.second, count_size);
}

void print_counts(count_map const& counts)
{
  auto longest{get_longest_key(counts)};
  // For each word/count pair...
  for (count_pair pair: counts)
    print_pair(pair, longest);
}

int main()
{
  // Set the global locale to the native locale.
  std::locale::global(std::locale{""});
  initialize_streams();
  count_map counts{};
  sanitizer sanitize{std::locale{""}};
  // Read words from the standard i