message: hammer: removed unget function for wstring parsers
diff: @@ -123,13 +123,6 @@ class wide_string_input_adapter : public input_adapter_protocol
  std::char_traits<char>::int_type get_character() noexcept override
  {
  - // unget_character() was called previously: return the last character
  - if (next_unget)
  - {
  - next_unget = false;
  - return last_char;
  - }
  -
  // check if buffer needs to be filled
  if (utf8_bytes_index == utf8_bytes_filled)
  {
  @@ -149,12 +142,7 @@ class wide_string_input_adapter : public input_adapter_protocol
  // use buffer
  assert(utf8_bytes_filled > 0);
  assert(utf8_bytes_index < utf8_bytes_filled);
  - return (last_char = utf8_bytes[utf8_bytes_index++]);
  - }
  -
  - void unget_character() noexcept override
  - {
  - next_unget = true;
  + return utf8_bytes[utf8_bytes_index++];
  }
  private:
  @@ -278,11 +266,6 @@ class wide_string_input_adapter : public input_adapter_protocol
  std::size_t utf8_bytes_index = 0;
  /// number of valid bytes in the utf8_codes array
  std::size_t utf8_bytes_filled = 0;
  -
  - /// the last character (returned after unget_character() is called)
  - std::char_traits<char>::int_type last_char = 0;
  - /// whether get_character() should return last_char
  - bool next_unget = false;
  };
  class input_adapter
  