添加智能灯固件代码

firmware/esp-idf/wumei-smart-firmware/examples/cxx/exceptions/main/CMakeLists.txt

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+idf_component_register(SRCS "exception_example_main.cpp"
+                    INCLUDE_DIRS ".")

firmware/esp-idf/wumei-smart-firmware/examples/cxx/exceptions/main/component.mk

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+#
+# "main" pseudo-component makefile.
+#
+# (Uses default behaviour of compiling all source files in directory, adding 'include' to include path.)

firmware/esp-idf/wumei-smart-firmware/examples/cxx/exceptions/main/exception_example_main.cpp

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+/* C++ exception handling example
+
+   This example code is in the Public Domain (or CC0 licensed, at your option.)
+
+   Unless required by applicable law or agreed to in writing, this
+   software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
+   CONDITIONS OF ANY KIND, either express or implied.
+*/
+
+#include <iostream>
+
+using std::cout;
+using std::endl;
+using std::runtime_error;
+
+/* A simple class which may throw an exception from constructor */
+class Throwing
+{
+public:
+    Throwing(int arg)
+    : m_arg(arg)
+    {
+        cout << "In constructor, arg=" << arg << endl;
+        if (arg == 0) {
+            throw runtime_error("Exception in constructor");
+        }
+    }
+
+    ~Throwing()
+    {
+        cout << "In destructor, m_arg=" << m_arg << endl;
+    }
+
+protected:
+    int m_arg;
+};
+
+/* Inside .cpp file, app_main function must be declared with C linkage */
+extern "C" void app_main(void)
+{
+    cout << "app_main starting" << endl;
+
+    try {
+        /* This will succeed */
+        Throwing obj1(42);
+
+        /* This will throw an exception */
+        Throwing obj2(0);
+
+        cout << "This will not be printed" << endl;
+    } catch (const runtime_error &e) {
+        cout << "Exception caught: " << e.what() << endl;
+    }
+
+    cout << "app_main done" << endl;
+}