Create __func__.cpp

Author: XuhuaHuang

__func__.cpp

@@ -0,0 +1,78 @@
+/*****************************************************************//**
+ * \file   __func__.cpp
+ * \brief  Demonstration of __cplusplus macro and __func__ signature
+ * __func__ attribute of each function defaults to the name of such fn
+ * 
+ * To compile on Windows:
+ * $ g++ -o func.exe .\__func__.cpp -std=c++11
+ * $ .\func.exe
+ * 
+ * \author Xuhua Huang
+ * \date   October 2021
+ *********************************************************************/
+
+#if __cplusplus < 201103L
+    #error "Should use C++ 11 implementation!"
+#endif
+
+#include <iostream>
+#include <stdlib.h>
+#include <stdio.h>
+
+#ifndef LOG
+#define LOG(...) {\
+    fprintf(stderr, "%s: Line %d:\t", __FILE__, __LINE__);\
+    fprintf(stderr, __VA_ARGS__);\
+    fprintf(stderr, "\n");\
+}
+#endif // !LOG
+
+#ifndef __USR_NO_EXCEPT__
+#define __USR_NO_EXCEPT__ true
+#endif
+
+/* Function set to not throwing any exceptions
+ * as per requested by the user using a macro.
+ * std::terminate will handle all the panicking.
+ */
+const char* hello() noexcept(__USR_NO_EXCEPT__) {
+    // Equivalence of defining the following manually:
+    // static const char* __func__ = "hello";
+    return __func__;
+}
+
+const char* world() noexcept(__USR_NO_EXCEPT__) {
+    // Equivalence of defining the following manually:
+    // static const char* __func__ = "world";
+    return __func__;
+}
+
+/* __func__ in struct */
+typedef struct TestStruct {
+public:
+    TestStruct() : name(__func__) {}
+    const char* getName(void) { return name; }
+private:
+    const char* name;
+} TestStruct;
+
+int main(void)
+{
+    /* Test __func__ predefined macro */
+    std::cout << hello() << "\n" 
+        <<world() << std::endl;
+    LOG("Function call hello() returns: %s", hello());
+    LOG("Function call world() returns: %s", world());
+
+    /* Testing the LOG(...) macro */
+    int x = 5;
+    LOG("x = %d", x);
+    
+    /* Testing TestStruct constructor with __func__ */
+    TestStruct* ts = new TestStruct();
+    LOG("__func__ in TestStruct constructor has the value of: %s", ts->getName());
+    delete ts;
+
+    system("pause");
+    return 0;
+}