Add Status

paddle/utils/Status.h

+/* Copyright (c) 2016 PaddlePaddle Authors. All Rights Reserve.
+
+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. */
+#include <memory>
+#include <string>
+
+namespace paddle {
+
+class Status final : public std::exception {
+public:
+  Status() noexcept {}
+
+  Status(const std::string& msg) : errMsg_(new std::string(msg)) {}
+
+  virtual const char* what() const noexcept override {
+    if (errMsg_) {
+      return errMsg_->data();
+    } else {
+      return nullptr;
+    }
+  }
+
+  inline bool isOK() const noexcept { return errMsg_ == nullptr; }
+
+private:
+  std::unique_ptr<std::string> errMsg_;
+};
+
+}  // namespace paddle