diff options
| -rw-r--r-- | src/Makefile.am | 1 | ||||
| -rw-r--r-- | src/util/result.h | 43 |
2 files changed, 44 insertions, 0 deletions
diff --git a/src/Makefile.am b/src/Makefile.am index 3fbbe180fc..a9e9db0a7d 100644 --- a/src/Makefile.am +++ b/src/Makefile.am @@ -277,6 +277,7 @@ BITCOIN_CORE_H = \ util/overloaded.h \ util/rbf.h \ util/readwritefile.h \ + util/result.h \ util/serfloat.h \ util/settings.h \ util/sock.h \ diff --git a/src/util/result.h b/src/util/result.h new file mode 100644 index 0000000000..dcf5edaa5b --- /dev/null +++ b/src/util/result.h @@ -0,0 +1,43 @@ +// 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(const T& _obj) : m_variant(_obj) {} + BResult(const bilingual_str& error) : m_variant(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); + } + + /* 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 |