40 lines
829 B
C++
40 lines
829 B
C++
#pragma once
|
|
|
|
#include <variant>
|
|
#include <type_traits>
|
|
|
|
template<typename SuccessType, typename ErrorType>
|
|
struct Expected
|
|
{
|
|
Expected(SuccessType&& result)
|
|
requires (
|
|
!std::is_reference_v<SuccessType>
|
|
&& !std::is_fundamental_v<SuccessType>
|
|
)
|
|
: result(std::move(result))
|
|
{}
|
|
|
|
Expected(const SuccessType& result)
|
|
: result(result)
|
|
{}
|
|
|
|
Expected(const ErrorType& result)
|
|
: result(result)
|
|
{}
|
|
|
|
bool hasValue() const {
|
|
return std::holds_alternative<SuccessType>(this->result);
|
|
}
|
|
|
|
const SuccessType& value() const {
|
|
return std::get<SuccessType>(this->result);
|
|
}
|
|
|
|
const ErrorType& error() const {
|
|
return std::get<ErrorType>(this->result);
|
|
}
|
|
|
|
private:
|
|
std::variant<SuccessType, ErrorType> result;
|
|
};
|