doc: convert asciidoc to md

[staging/windowmanager.git] / src / result.hpp

diff --git a/src/result.hpp b/src/result.hpp
index 377d5a2..e14f92b 100644 (file)
--- a/src/result.hpp
+++ b/src/result.hpp
@@ -1,11 +1,24 @@
-//
-// Created by mfritzsc on 7/12/17.
-//
+/*
+ * Copyright (C) 2017 Mentor Graphics Development (Deutschland) GmbH
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
 
 #ifndef TMCAGLWM_RESULT_HPP
 #define TMCAGLWM_RESULT_HPP
 
 #include <experimental/optional>
+#include <functional>
 
 namespace wm {
 
@@ -22,9 +35,23 @@ struct result {
    bool is_ok() const { return this->t != nullopt; }
    bool is_err() const { return this->e != nullptr; }
 
-   T unwrap() { return this->t.value(); }
+   T unwrap() {
+      if (this->e != nullptr) {
+         throw std::logic_error(this->e);
+      }
+      return this->t.value();
+   }
+
+   operator T() { return this->unwrap(); }
 
    char const *unwrap_err() { return this->e; }
+
+   optional<T> const &ok() const { return this->t; }
+   optional<char const *> err() const {
+      return this->e ? optional<char const *>(this->e) : nullopt;
+   }
+
+   result<T> map_err(std::function<char const *(char const *)> f);
 };
 
 template <typename T>
@@ -37,6 +64,14 @@ struct result<T> Ok(T t) {
    return result<T>{nullptr, t};
 }
 
+template <typename T>
+result<T> result<T>::map_err(std::function<char const *(char const *)> f) {
+   if (this->is_err()) {
+      return Err<T>(f(this->e));
+   }
+   return *this;
+}
+
 }  // namespace wm
 
 #endif  // TMCAGLWM_RESULT_HPP