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//
// Created by mfritzsc on 7/12/17.
//
#ifndef TMCAGLWM_RESULT_HPP
#define TMCAGLWM_RESULT_HPP
#include <experimental/optional>
namespace wm {
using std::experimental::optional;
using std::experimental::nullopt;
// We only ever return a string as an error - so just parametrize
// this over result type T
template <typename T>
struct result {
char const *e;
optional<T> t;
bool is_ok() const { return this->t != nullopt; }
bool is_err() const { return this->e != nullptr; }
T unwrap() {
if (this->e != nullptr) {
throw std::logic_error(this->e);
}
return this->t.value();
}
operator T() {
return this->unwrap();
}
char const *unwrap_err() { return this->e; }
};
template <typename T>
struct result<T> Err(char const *e) {
return result<T>{e, nullopt};
}
template <typename T>
struct result<T> Ok(T t) {
return result<T>{nullptr, t};
}
} // namespace wm
#endif // TMCAGLWM_RESULT_HPP
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