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// Copyright (c) 2022 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or https://www.opensource.org/licenses/mit-license.php.
#ifndef BITCOIN_UTIL_RESULT_H
#define BITCOIN_UTIL_RESULT_H
#include <util/translation.h>
#include <variant>
/*
* 'BResult' is a generic class useful for wrapping a return object
* (in case of success) or propagating the error cause.
*/
template<class T>
class BResult {
private:
std::variant<bilingual_str, T> m_variant;
public:
BResult() : m_variant{Untranslated("")} {}
BResult(T obj) : m_variant{std::move(obj)} {}
BResult(bilingual_str error) : m_variant{std::move(error)} {}
/* Whether the function succeeded or not */
bool HasRes() const { return std::holds_alternative<T>(m_variant); }
/* In case of success, the result object */
const T& GetObj() const {
assert(HasRes());
return std::get<T>(m_variant);
}
T ReleaseObj()
{
assert(HasRes());
return std::move(std::get<T>(m_variant));
}
/* In case of failure, the error cause */
const bilingual_str& GetError() const {
assert(!HasRes());
return std::get<bilingual_str>(m_variant);
}
explicit operator bool() const { return HasRes(); }
};
#endif // BITCOIN_UTIL_RESULT_H
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