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std::u16string and Unicode characters across C++ standards. #871

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std::u16string and Unicode characters across C++ standards. #871

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6 changes: 6 additions & 0 deletions rosidl_runtime_cpp/include/rosidl_runtime_cpp/traits.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -129,14 +129,20 @@ inline void value_to_yaml(const std::string & value, std::ostream & out)
inline void value_to_yaml(const std::u16string & value, std::ostream & out)
{
out << "\"";
#if __cplusplus < 201703L
std::wstring_convert<std::codecvt_utf8_utf16<char16_t>, char16_t> convert;
#endif
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
#if __cplusplus < 201703L
std::string character_as_string = convert.to_bytes(character);
out << std::hex << character_as_string.c_str();
#else
out << static_cast<char>(character);
#endif
} else if (!(character & 0xff00)) { // only 1 byte set
out << "\\x" << std::hex << std::setw(2) << std::setfill('0') << \
character;
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