[libcamera-devel] [PATCH v5 2/9] libcamera: yaml_parser: Replace ok flag to get() with std::optional

Christian Rauch Rauch.Christian at gmx.de
Fri Aug 5 00:06:30 CEST 2022


Thanks Laurent, the patch seems to work [1].

[1] https://github.com/christianrauch/libcamera-ci/actions/runs/2799422430

Am 04.08.22 um 00:12 schrieb Laurent Pinchart:
> Hi Christian,
>
> On Wed, Aug 03, 2022 at 09:10:19PM +0200, Christian Rauch via libcamera-devel wrote:
>> Am 03.08.22 um 00:01 schrieb Laurent Pinchart:
>>> On Tue, Aug 02, 2022 at 10:47:52PM +0200, Christian Rauch via libcamera-devel wrote:
>>>> Dear Laurent,
>>>>
>>>> The "return {};" in this patch cause "maybe-uninitialized" warnings in
>>>> my CI pipeline:
>>>
>>> Thank you for the report. We have CI pipelines too, but clearly, there
>>> are way more compiler/platform combinations out there that we test at
>>> the moment :-)
>>>
>>> Could you report the compiler, compiler version and platform, for my
>>> information ?
>>
>> It's an arm64 corss compile workflow with gcc 9 [1]. See the full log at
>> [2].
>>
>> [1] https://github.com/christianrauch/libcamera-ci/blob/ci/.github/workflows/main_cross.yml
>> [2] https://github.com/christianrauch/libcamera-ci/runs/7639256594?check_suite_focus=true
>
> Could you test the following patch to see if it fixes the problem ? If
> so I'll send it with a proper commit message.
>
> diff --git a/src/libcamera/yaml_parser.cpp b/src/libcamera/yaml_parser.cpp
> index c96e99e1317c..9162e2250ed4 100644
> --- a/src/libcamera/yaml_parser.cpp
> +++ b/src/libcamera/yaml_parser.cpp
> @@ -121,24 +121,24 @@ template<>
>  std::optional<bool> YamlObject::get() const
>  {
>  	if (type_ != Type::Value)
> -		return {};
> +		return std::nullopt;
>
>  	if (value_ == "true")
>  		return true;
>  	else if (value_ == "false")
>  		return false;
>
> -	return {};
> +	return std::nullopt;
>  }
>
>  template<>
>  std::optional<int16_t> YamlObject::get() const
>  {
>  	if (type_ != Type::Value)
> -		return {};
> +		return std::nullopt;
>
>  	if (value_ == "")
> -		return {};
> +		return std::nullopt;
>
>  	char *end;
>
> @@ -148,7 +148,7 @@ std::optional<int16_t> YamlObject::get() const
>  	if ('\0' != *end || errno == ERANGE ||
>  	    value < std::numeric_limits<int16_t>::min() ||
>  	    value > std::numeric_limits<int16_t>::max())
> -		return {};
> +		return std::nullopt;
>
>  	return value;
>  }
> @@ -157,10 +157,10 @@ template<>
>  std::optional<uint16_t> YamlObject::get() const
>  {
>  	if (type_ != Type::Value)
> -		return {};
> +		return std::nullopt;
>
>  	if (value_ == "")
> -		return {};
> +		return std::nullopt;
>
>  	/*
>  	 * libyaml parses all scalar values as strings. When a string has
> @@ -171,7 +171,7 @@ std::optional<uint16_t> YamlObject::get() const
>  	 */
>  	std::size_t found = value_.find_first_not_of(" \t");
>  	if (found != std::string::npos && value_[found] == '-')
> -		return {};
> +		return std::nullopt;
>
>  	char *end;
>
> @@ -181,7 +181,7 @@ std::optional<uint16_t> YamlObject::get() const
>  	if ('\0' != *end || errno == ERANGE ||
>  	    value < std::numeric_limits<uint16_t>::min() ||
>  	    value > std::numeric_limits<uint16_t>::max())
> -		return {};
> +		return std::nullopt;
>
>  	return value;
>  }
> @@ -190,10 +190,10 @@ template<>
>  std::optional<int32_t> YamlObject::get() const
>  {
>  	if (type_ != Type::Value)
> -		return {};
> +		return std::nullopt;
>
>  	if (value_ == "")
> -		return {};
> +		return std::nullopt;
>
>  	char *end;
>
> @@ -203,7 +203,7 @@ std::optional<int32_t> YamlObject::get() const
>  	if ('\0' != *end || errno == ERANGE ||
>  	    value < std::numeric_limits<int32_t>::min() ||
>  	    value > std::numeric_limits<int32_t>::max())
> -		return {};
> +		return std::nullopt;
>
>  	return value;
>  }
> @@ -212,10 +212,10 @@ template<>
>  std::optional<uint32_t> YamlObject::get() const
>  {
>  	if (type_ != Type::Value)
> -		return {};
> +		return std::nullopt;
>
>  	if (value_ == "")
> -		return {};
> +		return std::nullopt;
>
>  	/*
>  	 * libyaml parses all scalar values as strings. When a string has
> @@ -226,7 +226,7 @@ std::optional<uint32_t> YamlObject::get() const
>  	 */
>  	std::size_t found = value_.find_first_not_of(" \t");
>  	if (found != std::string::npos && value_[found] == '-')
> -		return {};
> +		return std::nullopt;
>
>  	char *end;
>
> @@ -236,7 +236,7 @@ std::optional<uint32_t> YamlObject::get() const
>  	if ('\0' != *end || errno == ERANGE ||
>  	    value < std::numeric_limits<uint32_t>::min() ||
>  	    value > std::numeric_limits<uint32_t>::max())
> -		return {};
> +		return std::nullopt;
>
>  	return value;
>  }
> @@ -245,10 +245,10 @@ template<>
>  std::optional<double> YamlObject::get() const
>  {
>  	if (type_ != Type::Value)
> -		return {};
> +		return std::nullopt;
>
>  	if (value_ == "")
> -		return {};
> +		return std::nullopt;
>
>  	char *end;
>
> @@ -256,7 +256,7 @@ std::optional<double> YamlObject::get() const
>  	double value = std::strtod(value_.c_str(), &end);
>
>  	if ('\0' != *end || errno == ERANGE)
> -		return {};
> +		return std::nullopt;
>
>  	return value;
>  }
> @@ -265,7 +265,7 @@ template<>
>  std::optional<std::string> YamlObject::get() const
>  {
>  	if (type_ != Type::Value)
> -		return {};
> +		return std::nullopt;
>
>  	return value_;
>  }
> @@ -274,18 +274,18 @@ template<>
>  std::optional<Size> YamlObject::get() const
>  {
>  	if (type_ != Type::List)
> -		return {};
> +		return std::nullopt;
>
>  	if (list_.size() != 2)
> -		return {};
> +		return std::nullopt;
>
>  	auto width = list_[0].value->get<uint32_t>();
>  	if (!width)
> -		return {};
> +		return std::nullopt;
>
>  	auto height = list_[1].value->get<uint32_t>();
>  	if (!height)
> -		return {};
> +		return std::nullopt;
>
>  	return Size(*width, *height);
>  }
>
>
>>>> ../src/libcamera/yaml_parser.cpp: In member function ‘std::optional<_Tp>
>>>> libcamera::YamlObject::get() const [with T = short unsigned int;
>>>> std::enable_if_t<(((((((is_same_v<bool, T> || is_same_v<double, T>) ||
>>>> is_same_v<short int, T>) || is_same_v<short unsigned int, T>) ||
>>>> is_same_v<int, T>) || is_same_v<unsigned int, T>) ||
>>>> is_same_v<std::__cxx11::basic_string<char, std::char_traits<char>,
>>>> std::allocator<char> >, T>) || is_same_v<libcamera::Size, T>)>*
>>>> <anonymous> = 0]’:
>>>> ../src/libcamera/yaml_parser.cpp:184:11: error: ‘<anonymous>’ may be
>>>> used uninitialized in this function [-Werror=maybe-uninitialized]
>>>>   184 |   return {};
>>>>       |           ^
>>>>
>>>> ... and a couple more in "yaml_parser.cpp".
>>>>
>>>> Since your intention is here to notify the user of invalid values,
>>>> wouldn't it be better to "return nullptr;" instead?
>>>
>>> The would be std::nullopt as the function returns a std::optional<>, but
>>> yes, that would make sense. I was expecting {} to do the same.
>>>
>>> As I can't test if this would fix the compilation warning given that I
>>> can't reproduce them, would you be able to test that change with your CI
>>> pipeline ? If std::nullopt fixes the errors, I can send a patch, or you
>>> can send one directly if you prefer.
>>>
>>>> Am 28.07.22 um 00:21 schrieb Laurent Pinchart via libcamera-devel:
>>>>> The YamlObject::get() function takes a default value and an optional
>>>>> bool ok flag to handle parsing errors. This ad-hoc mechanism complicates
>>>>> error handling in callers.
>>>>>
>>>>> A better API is possible by dropping the default value and ok flag and
>>>>> returning an std::optional. Not only does it simplify the calls, it also
>>>>> lets callers handle errors through the standard std::optional class
>>>>> instead of the current ad-hoc mechanism.
>>>>>
>>>>> Provide a get() wrapper around std::optional::value_or() to further
>>>>> simplify callers that don't need any specific error handling.
>>>>>
>>>>> Signed-off-by: Laurent Pinchart <laurent.pinchart at ideasonboard.com>
>>>>> Reviewed-by: Naushir Patuck <naush at raspberrypi.com>
>>>>> Tested-by: Naushir Patuck <naush at raspberrypi.com>
>>>>> ---
>>>>>  include/libcamera/internal/yaml_parser.h |   9 +-
>>>>>  src/libcamera/yaml_parser.cpp            | 138 +++++++++--------------
>>>>>  test/yaml-parser.cpp                     |  71 ++++++------
>>>>>  3 files changed, 96 insertions(+), 122 deletions(-)
>>>>>
>>>>> diff --git a/include/libcamera/internal/yaml_parser.h b/include/libcamera/internal/yaml_parser.h
>>>>> index 064cf44381d7..61f2223223a7 100644
>>>>> --- a/include/libcamera/internal/yaml_parser.h
>>>>> +++ b/include/libcamera/internal/yaml_parser.h
>>>>> @@ -9,6 +9,7 @@
>>>>>
>>>>>  #include <iterator>
>>>>>  #include <map>
>>>>> +#include <optional>
>>>>>  #include <string>
>>>>>  #include <vector>
>>>>>
>>>>> @@ -165,7 +166,13 @@ public:
>>>>>  #else
>>>>>  	template<typename T>
>>>>>  #endif
>>>>> -	T get(const T &defaultValue, bool *ok = nullptr) const;
>>>>> +	std::optional<T> get() const;
>>>>> +
>>>>> +	template<typename T>
>>>>> +	T get(const T &defaultValue) const
>>>>> +	{
>>>>> +		return get<T>().value_or(defaultValue);
>>>>> +	}
>>>>>
>>>>>  	DictAdapter asDict() const { return DictAdapter{ dictionary_ }; }
>>>>>  	ListAdapter asList() const { return ListAdapter{ list_ }; }
>>>>> diff --git a/src/libcamera/yaml_parser.cpp b/src/libcamera/yaml_parser.cpp
>>>>> index 5c45e44e49c3..4299f5abd38a 100644
>>>>> --- a/src/libcamera/yaml_parser.cpp
>>>>> +++ b/src/libcamera/yaml_parser.cpp
>>>>> @@ -31,12 +31,6 @@ namespace {
>>>>>  /* Empty static YamlObject as a safe result for invalid operations */
>>>>>  static const YamlObject empty;
>>>>>
>>>>> -void setOk(bool *ok, bool result)
>>>>> -{
>>>>> -	if (ok)
>>>>> -		*ok = result;
>>>>> -}
>>>>> -
>>>>>  } /* namespace */
>>>>>
>>>>>  /**
>>>>> @@ -100,54 +94,52 @@ std::size_t YamlObject::size() const
>>>>>  }
>>>>>
>>>>>  /**
>>>>> - * \fn template<typename T> YamlObject::get<T>(
>>>>> - *	const T &defaultValue, bool *ok) const
>>>>> + * \fn template<typename T> YamlObject::get<T>() const
>>>>> + * \brief Parse the YamlObject as a \a T value
>>>>> + *
>>>>> + * This function parses the value of the YamlObject as a \a T object, and
>>>>> + * returns the value. If parsing fails (usually because the YamlObject doesn't
>>>>> + * store a \a T value), std::nullopt is returned.
>>>>> + *
>>>>> + * \return The YamlObject value, or std::nullopt if parsing failed
>>>>> + */
>>>>> +
>>>>> +/**
>>>>> + * \fn template<typename T> YamlObject::get<T>(const T &defaultValue) const
>>>>>   * \brief Parse the YamlObject as a \a T value
>>>>>   * \param[in] defaultValue The default value when failing to parse
>>>>> - * \param[out] ok The result of whether the parse succeeded
>>>>>   *
>>>>>   * This function parses the value of the YamlObject as a \a T object, and
>>>>>   * returns the value. If parsing fails (usually because the YamlObject doesn't
>>>>> - * store a \a T value), the \a defaultValue is returned, and \a ok is set to
>>>>> - * false. Otherwise, the YamlObject value is returned, and \a ok is set to true.
>>>>> + * store a \a T value), the \a defaultValue is returned.
>>>>>   *
>>>>> - * The \a ok pointer is optional and can be a nullptr if the caller doesn't
>>>>> - * need to know if parsing succeeded.
>>>>> - *
>>>>> - * \return Value as a bool type
>>>>> + * \return The YamlObject value, or \a defaultValue if parsing failed
>>>>>   */
>>>>>
>>>>>  #ifndef __DOXYGEN__
>>>>>
>>>>>  template<>
>>>>> -bool YamlObject::get(const bool &defaultValue, bool *ok) const
>>>>> +std::optional<bool> YamlObject::get() const
>>>>>  {
>>>>> -	setOk(ok, false);
>>>>> -
>>>>>  	if (type_ != Type::Value)
>>>>> -		return defaultValue;
>>>>> +		return {};
>>>>>
>>>>> -	if (value_ == "true") {
>>>>> -		setOk(ok, true);
>>>>> +	if (value_ == "true")
>>>>>  		return true;
>>>>> -	} else if (value_ == "false") {
>>>>> -		setOk(ok, true);
>>>>> +	else if (value_ == "false")
>>>>>  		return false;
>>>>> -	}
>>>>>
>>>>> -	return defaultValue;
>>>>> +	return {};
>>>>>  }
>>>>>
>>>>>  template<>
>>>>> -int16_t YamlObject::get(const int16_t &defaultValue, bool *ok) const
>>>>> +std::optional<int16_t> YamlObject::get() const
>>>>>  {
>>>>> -	setOk(ok, false);
>>>>> -
>>>>>  	if (type_ != Type::Value)
>>>>> -		return defaultValue;
>>>>> +		return {};
>>>>>
>>>>>  	if (value_ == "")
>>>>> -		return defaultValue;
>>>>> +		return {};
>>>>>
>>>>>  	char *end;
>>>>>
>>>>> @@ -157,22 +149,19 @@ int16_t YamlObject::get(const int16_t &defaultValue, bool *ok) const
>>>>>  	if ('\0' != *end || errno == ERANGE ||
>>>>>  	    value < std::numeric_limits<int16_t>::min() ||
>>>>>  	    value > std::numeric_limits<int16_t>::max())
>>>>> -		return defaultValue;
>>>>> +		return {};
>>>>>
>>>>> -	setOk(ok, true);
>>>>>  	return value;
>>>>>  }
>>>>>
>>>>>  template<>
>>>>> -uint16_t YamlObject::get(const uint16_t &defaultValue, bool *ok) const
>>>>> +std::optional<uint16_t> YamlObject::get() const
>>>>>  {
>>>>> -	setOk(ok, false);
>>>>> -
>>>>>  	if (type_ != Type::Value)
>>>>> -		return defaultValue;
>>>>> +		return {};
>>>>>
>>>>>  	if (value_ == "")
>>>>> -		return defaultValue;
>>>>> +		return {};
>>>>>
>>>>>  	/*
>>>>>  	 * libyaml parses all scalar values as strings. When a string has
>>>>> @@ -183,7 +172,7 @@ uint16_t YamlObject::get(const uint16_t &defaultValue, bool *ok) const
>>>>>  	 */
>>>>>  	std::size_t found = value_.find_first_not_of(" \t");
>>>>>  	if (found != std::string::npos && value_[found] == '-')
>>>>> -		return defaultValue;
>>>>> +		return {};
>>>>>
>>>>>  	char *end;
>>>>>
>>>>> @@ -193,22 +182,19 @@ uint16_t YamlObject::get(const uint16_t &defaultValue, bool *ok) const
>>>>>  	if ('\0' != *end || errno == ERANGE ||
>>>>>  	    value < std::numeric_limits<uint16_t>::min() ||
>>>>>  	    value > std::numeric_limits<uint16_t>::max())
>>>>> -		return defaultValue;
>>>>> +		return {};
>>>>>
>>>>> -	setOk(ok, true);
>>>>>  	return value;
>>>>>  }
>>>>>
>>>>>  template<>
>>>>> -int32_t YamlObject::get(const int32_t &defaultValue, bool *ok) const
>>>>> +std::optional<int32_t> YamlObject::get() const
>>>>>  {
>>>>> -	setOk(ok, false);
>>>>> -
>>>>>  	if (type_ != Type::Value)
>>>>> -		return defaultValue;
>>>>> +		return {};
>>>>>
>>>>>  	if (value_ == "")
>>>>> -		return defaultValue;
>>>>> +		return {};
>>>>>
>>>>>  	char *end;
>>>>>
>>>>> @@ -218,22 +204,19 @@ int32_t YamlObject::get(const int32_t &defaultValue, bool *ok) const
>>>>>  	if ('\0' != *end || errno == ERANGE ||
>>>>>  	    value < std::numeric_limits<int32_t>::min() ||
>>>>>  	    value > std::numeric_limits<int32_t>::max())
>>>>> -		return defaultValue;
>>>>> +		return {};
>>>>>
>>>>> -	setOk(ok, true);
>>>>>  	return value;
>>>>>  }
>>>>>
>>>>>  template<>
>>>>> -uint32_t YamlObject::get(const uint32_t &defaultValue, bool *ok) const
>>>>> +std::optional<uint32_t> YamlObject::get() const
>>>>>  {
>>>>> -	setOk(ok, false);
>>>>> -
>>>>>  	if (type_ != Type::Value)
>>>>> -		return defaultValue;
>>>>> +		return {};
>>>>>
>>>>>  	if (value_ == "")
>>>>> -		return defaultValue;
>>>>> +		return {};
>>>>>
>>>>>  	/*
>>>>>  	 * libyaml parses all scalar values as strings. When a string has
>>>>> @@ -244,7 +227,7 @@ uint32_t YamlObject::get(const uint32_t &defaultValue, bool *ok) const
>>>>>  	 */
>>>>>  	std::size_t found = value_.find_first_not_of(" \t");
>>>>>  	if (found != std::string::npos && value_[found] == '-')
>>>>> -		return defaultValue;
>>>>> +		return {};
>>>>>
>>>>>  	char *end;
>>>>>
>>>>> @@ -254,22 +237,19 @@ uint32_t YamlObject::get(const uint32_t &defaultValue, bool *ok) const
>>>>>  	if ('\0' != *end || errno == ERANGE ||
>>>>>  	    value < std::numeric_limits<uint32_t>::min() ||
>>>>>  	    value > std::numeric_limits<uint32_t>::max())
>>>>> -		return defaultValue;
>>>>> +		return {};
>>>>>
>>>>> -	setOk(ok, true);
>>>>>  	return value;
>>>>>  }
>>>>>
>>>>>  template<>
>>>>> -double YamlObject::get(const double &defaultValue, bool *ok) const
>>>>> +std::optional<double> YamlObject::get() const
>>>>>  {
>>>>> -	setOk(ok, false);
>>>>> -
>>>>>  	if (type_ != Type::Value)
>>>>> -		return defaultValue;
>>>>> +		return {};
>>>>>
>>>>>  	if (value_ == "")
>>>>> -		return defaultValue;
>>>>> +		return {};
>>>>>
>>>>>  	char *end;
>>>>>
>>>>> @@ -277,50 +257,38 @@ double YamlObject::get(const double &defaultValue, bool *ok) const
>>>>>  	double value = std::strtod(value_.c_str(), &end);
>>>>>
>>>>>  	if ('\0' != *end || errno == ERANGE)
>>>>> -		return defaultValue;
>>>>> +		return {};
>>>>>
>>>>> -	setOk(ok, true);
>>>>>  	return value;
>>>>>  }
>>>>>
>>>>>  template<>
>>>>> -std::string YamlObject::get(const std::string &defaultValue, bool *ok) const
>>>>> +std::optional<std::string> YamlObject::get() const
>>>>>  {
>>>>> -	setOk(ok, false);
>>>>> -
>>>>>  	if (type_ != Type::Value)
>>>>> -		return defaultValue;
>>>>> +		return {};
>>>>>
>>>>> -	setOk(ok, true);
>>>>>  	return value_;
>>>>>  }
>>>>>
>>>>>  template<>
>>>>> -Size YamlObject::get(const Size &defaultValue, bool *ok) const
>>>>> +std::optional<Size> YamlObject::get() const
>>>>>  {
>>>>> -	setOk(ok, false);
>>>>> -
>>>>>  	if (type_ != Type::List)
>>>>> -		return defaultValue;
>>>>> +		return {};
>>>>>
>>>>>  	if (list_.size() != 2)
>>>>> -		return defaultValue;
>>>>> +		return {};
>>>>>
>>>>> -	/*
>>>>> -	 * Add a local variable to validate each dimension in case
>>>>> -	 * that ok == nullptr.
>>>>> -	 */
>>>>> -	bool valid;
>>>>> -	uint32_t width = list_[0]->get<uint32_t>(0, &valid);
>>>>> -	if (!valid)
>>>>> -		return defaultValue;
>>>>> +	auto width = list_[0]->get<uint32_t>();
>>>>> +	if (!width)
>>>>> +		return {};
>>>>>
>>>>> -	uint32_t height = list_[1]->get<uint32_t>(0, &valid);
>>>>> -	if (!valid)
>>>>> -		return defaultValue;
>>>>> +	auto height = list_[1]->get<uint32_t>();
>>>>> +	if (!height)
>>>>> +		return {};
>>>>>
>>>>> -	setOk(ok, true);
>>>>> -	return Size(width, height);
>>>>> +	return Size(*width, *height);
>>>>>  }
>>>>>
>>>>>  #endif /* __DOXYGEN__ */
>>>>> diff --git a/test/yaml-parser.cpp b/test/yaml-parser.cpp
>>>>> index 38f848232fa6..ebb654f2ef9c 100644
>>>>> --- a/test/yaml-parser.cpp
>>>>> +++ b/test/yaml-parser.cpp
>>>>> @@ -148,7 +148,6 @@ protected:
>>>>>  		}
>>>>>
>>>>>  		/* Test string object */
>>>>> -		bool ok;
>>>>>  		auto &strObj = (*root)["string"];
>>>>>
>>>>>  		if (strObj.isDictionary()) {
>>>>> @@ -161,27 +160,27 @@ protected:
>>>>>  			return TestFail;
>>>>>  		}
>>>>>
>>>>> -		if (strObj.get<string>("", &ok) != "libcamera" || !ok) {
>>>>> +		if (strObj.get<string>().value_or("") != "libcamera") {
>>>>>  			cerr << "String object parse as wrong content" << std::endl;
>>>>>  			return TestFail;
>>>>>  		}
>>>>>
>>>>> -		if (strObj.get<int32_t>(-1, &ok) != -1 || ok) {
>>>>> +		if (strObj.get<int32_t>()) {
>>>>>  			cerr << "String object parse as integer" << std::endl;
>>>>>  			return TestFail;
>>>>>  		}
>>>>>
>>>>> -		if (strObj.get<uint32_t>(1, &ok) != 1 || ok) {
>>>>> +		if (strObj.get<uint32_t>()) {
>>>>>  			cerr << "String object parse as unsigned integer" << std::endl;
>>>>>  			return TestFail;
>>>>>  		}
>>>>>
>>>>> -		if (strObj.get<double>(1.0, &ok) != 1.0 || ok) {
>>>>> +		if (strObj.get<double>()) {
>>>>>  			cerr << "String object parse as double" << std::endl;
>>>>>  			return TestFail;
>>>>>  		}
>>>>>
>>>>> -		if (strObj.get<Size>(Size(0, 0), &ok) != Size(0, 0) || ok) {
>>>>> +		if (strObj.get<Size>()) {
>>>>>  			cerr << "String object parse as Size" << std::endl;
>>>>>  			return TestFail;
>>>>>  		}
>>>>> @@ -199,27 +198,27 @@ protected:
>>>>>  			return TestFail;
>>>>>  		}
>>>>>
>>>>> -		if (int32Obj.get<int32_t>(-100, &ok) != -100 || !ok) {
>>>>> +		if (int32Obj.get<int32_t>().value_or(0) != -100) {
>>>>>  			cerr << "Integer object parse as wrong value" << std::endl;
>>>>>  			return TestFail;
>>>>>  		}
>>>>>
>>>>> -		if (int32Obj.get<string>("", &ok) != "-100" || !ok) {
>>>>> +		if (int32Obj.get<string>().value_or("") != "-100") {
>>>>>  			cerr << "Integer object fail to parse as string" << std::endl;
>>>>>  			return TestFail;
>>>>>  		}
>>>>>
>>>>> -		if (int32Obj.get<double>(1.0, &ok) != -100.0 || !ok) {
>>>>> +		if (int32Obj.get<double>().value_or(0.0) != -100.0) {
>>>>>  			cerr << "Integer object fail to parse as double" << std::endl;
>>>>>  			return TestFail;
>>>>>  		}
>>>>>
>>>>> -		if (int32Obj.get<uint32_t>(1, &ok) != 1 || ok) {
>>>>> +		if (int32Obj.get<uint32_t>()) {
>>>>>  			cerr << "Negative integer object parse as unsigned integer" << std::endl;
>>>>>  			return TestFail;
>>>>>  		}
>>>>>
>>>>> -		if (int32Obj.get<Size>(Size(0, 0), &ok) != Size(0, 0) || ok) {
>>>>> +		if (int32Obj.get<Size>()) {
>>>>>  			cerr << "Integer object parse as Size" << std::endl;
>>>>>  			return TestFail;
>>>>>  		}
>>>>> @@ -237,27 +236,27 @@ protected:
>>>>>  			return TestFail;
>>>>>  		}
>>>>>
>>>>> -		if (uint32Obj.get<int32_t>(-1, &ok) != 100 || !ok) {
>>>>> +		if (uint32Obj.get<int32_t>().value_or(0) != 100) {
>>>>>  			cerr << "Unsigned integer object fail to parse as integer" << std::endl;
>>>>>  			return TestFail;
>>>>>  		}
>>>>>
>>>>> -		if (uint32Obj.get<string>("", &ok) != "100" || !ok) {
>>>>> +		if (uint32Obj.get<string>().value_or("") != "100") {
>>>>>  			cerr << "Unsigned integer object fail to parse as string" << std::endl;
>>>>>  			return TestFail;
>>>>>  		}
>>>>>
>>>>> -		if (uint32Obj.get<double>(1.0, &ok) != 100.0 || !ok) {
>>>>> +		if (uint32Obj.get<double>().value_or(0.0) != 100.0) {
>>>>>  			cerr << "Unsigned integer object fail to parse as double" << std::endl;
>>>>>  			return TestFail;
>>>>>  		}
>>>>>
>>>>> -		if (uint32Obj.get<uint32_t>(100, &ok) != 100 || !ok) {
>>>>> +		if (uint32Obj.get<uint32_t>().value_or(0) != 100) {
>>>>>  			cerr << "Unsigned integer object parsed as wrong value" << std::endl;
>>>>>  			return TestFail;
>>>>>  		}
>>>>>
>>>>> -		if (uint32Obj.get<Size>(Size(0, 0), &ok) != Size(0, 0) || ok) {
>>>>> +		if (uint32Obj.get<Size>()) {
>>>>>  			cerr << "Unsigned integer object parsed as Size" << std::endl;
>>>>>  			return TestFail;
>>>>>  		}
>>>>> @@ -275,27 +274,27 @@ protected:
>>>>>  			return TestFail;
>>>>>  		}
>>>>>
>>>>> -		if (doubleObj.get<string>("", &ok) != "3.14159" || !ok) {
>>>>> +		if (doubleObj.get<string>().value_or("") != "3.14159") {
>>>>>  			cerr << "Double object fail to parse as string" << std::endl;
>>>>>  			return TestFail;
>>>>>  		}
>>>>>
>>>>> -		if (doubleObj.get<double>(1.0, &ok) != 3.14159 || !ok) {
>>>>> +		if (doubleObj.get<double>().value_or(0.0) != 3.14159) {
>>>>>  			cerr << "Double object parse as wrong value" << std::endl;
>>>>>  			return TestFail;
>>>>>  		}
>>>>>
>>>>> -		if (doubleObj.get<int32_t>(-1, &ok) != -1 || ok) {
>>>>> +		if (doubleObj.get<int32_t>()) {
>>>>>  			cerr << "Double object parse as integer" << std::endl;
>>>>>  			return TestFail;
>>>>>  		}
>>>>>
>>>>> -		if (doubleObj.get<uint32_t>(1, &ok) != 1 || ok) {
>>>>> +		if (doubleObj.get<uint32_t>()) {
>>>>>  			cerr << "Double object parse as unsigned integer" << std::endl;
>>>>>  			return TestFail;
>>>>>  		}
>>>>>
>>>>> -		if (doubleObj.get<Size>(Size(0, 0), &ok) != Size(0, 0) || ok) {
>>>>> +		if (doubleObj.get<Size>()) {
>>>>>  			cerr << "Double object parse as Size" << std::endl;
>>>>>  			return TestFail;
>>>>>  		}
>>>>> @@ -313,27 +312,27 @@ protected:
>>>>>  			return TestFail;
>>>>>  		}
>>>>>
>>>>> -		if (sizeObj.get<string>("", &ok) != "" || ok) {
>>>>> +		if (sizeObj.get<string>()) {
>>>>>  			cerr << "Size object parse as string" << std::endl;
>>>>>  			return TestFail;
>>>>>  		}
>>>>>
>>>>> -		if (sizeObj.get<double>(1.0, &ok) != 1.0 || ok) {
>>>>> +		if (sizeObj.get<double>()) {
>>>>>  			cerr << "Size object parse as double" << std::endl;
>>>>>  			return TestFail;
>>>>>  		}
>>>>>
>>>>> -		if (sizeObj.get<int32_t>(-1, &ok) != -1 || ok) {
>>>>> +		if (sizeObj.get<int32_t>()) {
>>>>>  			cerr << "Size object parse as integer" << std::endl;
>>>>>  			return TestFail;
>>>>>  		}
>>>>>
>>>>> -		if (sizeObj.get<uint32_t>(1, &ok) != 1 || ok) {
>>>>> +		if (sizeObj.get<uint32_t>()) {
>>>>>  			cerr << "Size object parse as unsigned integer" << std::endl;
>>>>>  			return TestFail;
>>>>>  		}
>>>>>
>>>>> -		if (sizeObj.get<Size>(Size(0, 0), &ok) != Size(1920, 1080) || !ok) {
>>>>> +		if (sizeObj.get<Size>().value_or(Size(0, 0)) != Size(1920, 1080)) {
>>>>>  			cerr << "Size object parse as wrong value" << std::endl;
>>>>>  			return TestFail;
>>>>>  		}
>>>>> @@ -351,27 +350,27 @@ protected:
>>>>>  			return TestFail;
>>>>>  		}
>>>>>
>>>>> -		if (listObj.get<string>("", &ok) != "" || ok) {
>>>>> +		if (listObj.get<string>()) {
>>>>>  			cerr << "List object parse as string" << std::endl;
>>>>>  			return TestFail;
>>>>>  		}
>>>>>
>>>>> -		if (listObj.get<double>(1.0, &ok) != 1.0 || ok) {
>>>>> +		if (listObj.get<double>()) {
>>>>>  			cerr << "List object parse as double" << std::endl;
>>>>>  			return TestFail;
>>>>>  		}
>>>>>
>>>>> -		if (listObj.get<int32_t>(-1, &ok) != -1 || ok) {
>>>>> +		if (listObj.get<int32_t>()) {
>>>>>  			cerr << "List object parse as integer" << std::endl;
>>>>>  			return TestFail;
>>>>>  		}
>>>>>
>>>>> -		if (listObj.get<uint32_t>(1, &ok) != 1 || ok) {
>>>>> +		if (listObj.get<uint32_t>()) {
>>>>>  			cerr << "List object parse as unsigne integer" << std::endl;
>>>>>  			return TestFail;
>>>>>  		}
>>>>>
>>>>> -		if (listObj.get<Size>(Size(0, 0), &ok) != Size(0, 0) || ok) {
>>>>> +		if (listObj.get<Size>()) {
>>>>>  			cerr << "String list object parse as Size" << std::endl;
>>>>>  			return TestFail;
>>>>>  		}
>>>>> @@ -424,27 +423,27 @@ protected:
>>>>>  			return TestFail;
>>>>>  		}
>>>>>
>>>>> -		if (dictObj.get<string>("", &ok) != "" || ok) {
>>>>> +		if (dictObj.get<string>()) {
>>>>>  			cerr << "Dictionary object parse as string" << std::endl;
>>>>>  			return TestFail;
>>>>>  		}
>>>>>
>>>>> -		if (dictObj.get<double>(1.0, &ok) != 1.0 || ok) {
>>>>> +		if (dictObj.get<double>()) {
>>>>>  			cerr << "Dictionary object parse as double" << std::endl;
>>>>>  			return TestFail;
>>>>>  		}
>>>>>
>>>>> -		if (dictObj.get<int32_t>(-1, &ok) != -1 || ok) {
>>>>> +		if (dictObj.get<int32_t>()) {
>>>>>  			cerr << "Dictionary object parse as integer" << std::endl;
>>>>>  			return TestFail;
>>>>>  		}
>>>>>
>>>>> -		if (dictObj.get<uint32_t>(1, &ok) != 1 || ok) {
>>>>> +		if (dictObj.get<uint32_t>()) {
>>>>>  			cerr << "Dictionary object parse as unsigned integer" << std::endl;
>>>>>  			return TestFail;
>>>>>  		}
>>>>>
>>>>> -		if (dictObj.get<Size>(Size(0, 0), &ok) != Size(0, 0) || ok) {
>>>>> +		if (dictObj.get<Size>()) {
>>>>>  			cerr << "Dictionary object parse as Size" << std::endl;
>>>>>  			return TestFail;
>>>>>  		}
>


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