X-Git-Url: https://gerrit.automotivelinux.org/gerrit/gitweb?a=blobdiff_plain;f=src%2Fresult.hpp;h=e14f92b253b726b6a14fa3727de4855aaeff9a6b;hb=6fdda786876d9640a6a26f05ef2c5aa7e2175421;hp=e22fde9872260e05700d0b880277bacad54f6fad;hpb=5463a34f0136555cee0bfad9a1cb85e93aeb635c;p=staging%2Fwindowmanager.git

diff --git a/src/result.hpp b/src/result.hpp
index e22fde9..e14f92b 100644
--- 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 {
 
@@ -29,11 +42,16 @@ struct result {
       return this->t.value();
    }
 
-   operator T() {
-      return this->unwrap();
-   }
+   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>
@@ -46,6 +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