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util: Add void support to util::Result

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A minimal (but hacky) way to add support for void to Result
originally posted https://github.com/bitcoin/bitcoin/pull/27632#discussion_r1195604095
This commit is contained in:
MarcoFalke 2023-05-24 08:55:47 -04:00
parent 51c050787f
commit 5f49cb1bc8
1 changed files with 4 additions and 1 deletions
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5
src/util/result.h
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@ -31,16 +31,19 @@ struct Error {
//! `std::optional<T>` can be updated to return `util::Result<T>` and return
//! error strings usually just replacing `return std::nullopt;` with `return
//! util::Error{error_string};`.
template <class T>
template <class M>
class Result
{
private:
using T = std::conditional_t<std::is_same_v<M, void>, std::monostate, M>;
std::variant<bilingual_str, T> m_variant;
template <typename FT>
friend bilingual_str ErrorString(const Result<FT>& result);
public:
Result() : m_variant{std::in_place_index_t<1>{}, std::monostate{}} {} // constructor for void
Result(T obj) : m_variant{std::in_place_index_t<1>{}, std::move(obj)} {}
Result(Error error) : m_variant{std::in_place_index_t<0>{}, std::move(error.message)} {}