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authorBen Longbons <b.r.longbons@gmail.com>2014-10-19 22:22:08 -0700
committerBen Longbons <b.r.longbons@gmail.com>2014-10-26 14:21:48 -0700
commit6800761863dd45b6055768febc6ace6a20120dc7 (patch)
tree73b416ca6507d9bb4f950252d55ead8e8cda34b5 /src/compat/result.hpp
parent0edf563dfc14a2b9db33a92f0eced28950bdf1aa (diff)
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New ast module for for npc parsing
Will eventually put most/all parsers there.
Diffstat (limited to 'src/compat/result.hpp')
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diff --git a/src/compat/result.hpp b/src/compat/result.hpp
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+#pragma once
+// result.hpp - A possibly failed return value
+//
+// Copyright © 2014 Ben Longbons <b.r.longbons@gmail.com>
+//
+// This file is part of The Mana World (Athena server)
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+#include "fwd.hpp"
+
+#include "../strings/rstring.hpp"
+
+#include "option.hpp"
+
+namespace tmwa
+{
+ namespace result
+ {
+ enum ResultMagicFlag { magic_flag };
+
+ template<class T>
+ class Result
+ {
+ Option<T> success;
+ RString failure;
+ public:
+ Result(ResultMagicFlag, T v)
+ : success(Some(std::move(v))), failure()
+ {}
+ Result(ResultMagicFlag, RString msg)
+ : success(None), failure(std::move(msg))
+ {}
+
+ bool is_ok() { return success.is_some(); }
+ bool is_err() { return !is_ok(); }
+
+ Option<T>& get_success() { return success; }
+ RString& get_failure() { return failure; }
+ };
+
+ template<class T>
+ Result<T> Ok(T v)
+ {
+ return Result<T>(magic_flag, std::move(v));
+ }
+
+ struct Err
+ {
+ RString message;
+ Err(RString m) : message(std::move(m)) {}
+
+ template<class T>
+ operator Result<T>()
+ {
+ return Result<T>(magic_flag, message);
+ }
+ };
+ } // namespace result
+ using result::Result;
+ using result::Ok;
+ using result::Err;
+
+#define TRY(r) ({ auto _res = r; TRY_UNWRAP(_res.get_success(), return ::tmwa::Err(_res.get_failure())); })
+ // TODO the existence of this as a separate macro is a bug.
+#define TRY_MOVE(r) ({ auto _res = r; TRY_UNWRAP(std::move(_res.get_success()), return ::tmwa::Err(_res.get_failure())); })
+} // namespace tmwa