.. _program_listing_file_include_rosidl_runtime_cpp_traits.hpp:

Program Listing for File traits.hpp
===================================

|exhale_lsh| :ref:`Return to documentation for file <file_include_rosidl_runtime_cpp_traits.hpp>` (``include/rosidl_runtime_cpp/traits.hpp``)

.. |exhale_lsh| unicode:: U+021B0 .. UPWARDS ARROW WITH TIP LEFTWARDS

.. code-block:: cpp

   // Copyright 2018 Open Source Robotics Foundation, Inc.
   //
   // Licensed under the Apache License, Version 2.0 (the "License");
   // you may not use this file except in compliance with the License.
   // You may obtain a copy of the License at
   //
   //     http://www.apache.org/licenses/LICENSE-2.0
   //
   // Unless required by applicable law or agreed to in writing, software
   // distributed under the License is distributed on an "AS IS" BASIS,
   // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   // See the License for the specific language governing permissions and
   // limitations under the License.
   
   #ifndef ROSIDL_RUNTIME_CPP__TRAITS_HPP_
   #define ROSIDL_RUNTIME_CPP__TRAITS_HPP_
   
   #include <codecvt>
   #include <iomanip>
   #include <string>
   #include <type_traits>
   
   namespace rosidl_generator_traits
   {
   
   inline void value_to_yaml(bool value, std::ostream & out)
   {
     out << (value ? "true" : "false");
   }
   
   inline void character_value_to_yaml(unsigned char value, std::ostream & out)
   {
     auto flags = out.flags();
     out << "0x" << std::hex << std::setw(2) << std::setfill('0') << \
       static_cast<uint16_t>(value);
     out.flags(flags);
   }
   
   inline void character_value_to_yaml(char16_t value, std::ostream & out)
   {
     auto flags = out.flags();
     out << "\"\\u" << std::hex << std::setw(4) << std::setfill('0') << \
       static_cast<uint_least16_t>(value) << "\"";
     out.flags(flags);
   }
   
   inline void value_to_yaml(float value, std::ostream & out)
   {
     auto flags = out.flags();
     out << std::showpoint << value;
     out.flags(flags);
   }
   
   inline void value_to_yaml(double value, std::ostream & out)
   {
     auto flags = out.flags();
     out << std::showpoint << value;
     out.flags(flags);
   }
   
   inline void value_to_yaml(long double value, std::ostream & out)
   {
     auto flags = out.flags();
     out << std::showpoint << value;
     out.flags(flags);
   }
   
   inline void value_to_yaml(uint8_t value, std::ostream & out)
   {
     out << +value;
   }
   
   inline void value_to_yaml(int8_t value, std::ostream & out)
   {
     out << +value;
   }
   
   inline void value_to_yaml(uint16_t value, std::ostream & out)
   {
     out << value;
   }
   
   inline void value_to_yaml(int16_t value, std::ostream & out)
   {
     out << value;
   }
   
   inline void value_to_yaml(uint32_t value, std::ostream & out)
   {
     out << value;
   }
   
   inline void value_to_yaml(int32_t value, std::ostream & out)
   {
     out << value;
   }
   
   inline void value_to_yaml(uint64_t value, std::ostream & out)
   {
     out << value;
   }
   
   inline void value_to_yaml(int64_t value, std::ostream & out)
   {
     out << value;
   }
   
   inline void value_to_yaml(const std::string & value, std::ostream & out)
   {
     out << "\"";
     size_t index = 0;
     while (index < value.size()) {
       size_t pos = value.find_first_of("\\\"", index);
       if (pos == std::string::npos) {
         pos = value.size();
       }
       out.write(&value[index], pos - index);
       if (pos >= value.size()) {
         break;
       }
       out << "\\" << value[pos];
       index = pos + 1;
     }
     out << "\"";
   }
   
   inline void value_to_yaml(const std::u16string & value, std::ostream & out)
   {
     out << "\"";
     std::wstring_convert<std::codecvt_utf8_utf16<char16_t>, char16_t> convert;
     auto flags = out.flags();
     size_t index = 0;
     while (index < value.size()) {
       uint_least16_t character = static_cast<uint_least16_t>(value[index]);
       if (!(character & 0xff80)) {  // ASCII
         std::string character_as_string = convert.to_bytes(character);
         out << std::hex << character_as_string.c_str();
       } else if (!(character & 0xff00)) {  // only 1 byte set
         out << "\\x" << std::hex << std::setw(2) << std::setfill('0') << \
           character;
       } else {
         out << "\\u" << std::hex << std::setw(4) << std::setfill('0') << \
           character;
       }
       index += 1;
     }
     out.flags(flags);
     out << "\"";
   }
   
   template<typename T>
   inline const char * data_type();
   
   template<typename T>
   inline const char * name();
   
   template<typename T>
   struct has_fixed_size : std::false_type {};
   
   template<typename T>
   struct has_bounded_size : std::false_type {};
   
   template<typename T>
   struct is_message : std::false_type {};
   
   template<typename T>
   struct is_service : std::false_type {};
   
   template<typename T>
   struct is_service_request : std::false_type {};
   
   template<typename T>
   struct is_service_response : std::false_type {};
   
   template<typename T>
   struct is_action : std::false_type {};
   
   template<typename T>
   struct is_action_goal : std::false_type {};
   
   template<typename T>
   struct is_action_result : std::false_type {};
   
   template<typename T>
   struct is_action_feedback : std::false_type {};
   
   }  // namespace rosidl_generator_traits
   
   #endif  // ROSIDL_RUNTIME_CPP__TRAITS_HPP_