//
// 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() { return this->t.value(); }

        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