implement linux api

linux/src/ReturnCode.cpp

@@ -0,0 +1,51 @@
+/*
+ * Copyright (c) 2022 Taner Sener
+ *
+ * This file is part of FFmpegKit.
+ *
+ * FFmpegKit is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * FFmpegKit 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 Lesser General License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General License
+ *  along with FFmpegKit.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "ReturnCode.h"
+
+bool ffmpegkit::ReturnCode::isSuccess(const std::shared_ptr<ffmpegkit::ReturnCode> value) {
+    return (value != nullptr) && (value->getValue() == Success);
+}
+
+bool ffmpegkit::ReturnCode::isCancel(const std::shared_ptr<ffmpegkit::ReturnCode> value) {
+    return (value != nullptr) && (value->getValue() == Cancel);
+}
+
+ffmpegkit::ReturnCode::ReturnCode(const int value) : _value {value} {
+}
+
+int ffmpegkit::ReturnCode::getValue() const {
+    return _value;
+}
+
+bool ffmpegkit::ReturnCode::isValueSuccess() const {
+    return (_value == Success);
+}
+
+bool ffmpegkit::ReturnCode::isValueError() const {
+    return ((_value != Success) && (_value != Cancel));
+}
+
+bool ffmpegkit::ReturnCode::isValueCancel() const {
+    return (_value == Cancel);
+}
+
+std::ostream& operator<<(std::ostream& out, const ffmpegkit::ReturnCode& o) {
+    return out << o.getValue();
+}