Hi all,
I am trying to compile the following code, I am getting an error, and I
am unable to fix the error.
I am trying to compile this:
template<typename Pattern>
class HasAttributeMatchingValue: public
AnnotationUnaryPredicateWithStates<std::string, Pattern> {
bool operator() (const ELEP::CDM::Annotation& ann) const {
return ann.containsAttributeMatchingValue(std::get<0>(m_state),
std::get<1>(m_state));
};
};
The error I am getting is:
`m_state` was not declared in this scope: return
ann.containsAttributeMatchingValue(std::get<0>(m_state),
std::get<1>(m_state));
If I use instead:
template<typename Pattern>
class HasAttributeMatchingValue: public
AnnotationUnaryPredicateWithStates<std::string, std::string> {
bool operator() (const ELEP::CDM::Annotation& ann) const {
return ann.containsAttributeMatchingValue(std::get<0>(m_state),
std::get<1>(m_state));
};
};
It compiles without problem.
AnnotationUnaryPredicateWithStates is a template:
template<class... States> class AnnotationUnaryPredicateWithStates :
public UnaryPredicateWithStates<ELEP::CDM::Annotation, States ...
> {};
template<class Arg, class... States> class UnaryPredicateWithStates :
public UnaryFunctionWithStates<Arg, bool, States ... > {};
template<class Arg, class Result, class... Ts>
class UnaryFunctionWithStates : public UnaryFunction<Arg, Result> {
public:
UnaryFunctionWithStates() = default;
template <class... Args> UnaryFunctionWithStates(Args&&... args) :
m_state(std::forward<Args>(args)...) {};
protected:
std::tuple<Ts...> m_state;
};
template<class Arg, class Result> class UnaryFunction {
public:
virtual Result operator()(const Arg &) const = 0;
};
What am I doing wrong?
Kind regards,
George
