C++ constructors work with ELF load now

git-svn-id: http://svn.code.sf.net/p/nuttx/code/trunk@5273 42af7a65-404d-4744-a932-0658087f49c3
2026-10-21 06:43:34 +08:00 · 2012-10-29 19:32:05 +00:00
parent 71fad980c5
commit 5681b615ec
28 changed files with 1282 additions and 394 deletions
@@ -0,0 +1,123 @@
+/////////////////////////////////////////////////////////////////////////////
+// examples/elf/tests/helloxx/hello++2.c
+//
+//   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+//   Author: Gregory Nutt <gnutt@nuttx.org>
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions
+// are met:
+//
+// 1. Redistributions of source code must retain the above copyright
+//    notice, this list of conditions and the following disclaimer.
+// 2. Redistributions in binary form must reproduce the above copyright
+//    notice, this list of conditions and the following disclaimer in
+//    the documentation and/or other materials provided with the
+//    distribution.
+// 3. Neither the name NuttX nor the names of its contributors may be
+//    used to endorse or promote products derived from this software
+//    without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+// COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+// BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+// OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+// AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+// ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+// POSSIBILITY OF SUCH DAMAGE.
+//
+/////////////////////////////////////////////////////////////////////////////
+//
+// This is an another trivial version of "Hello, World" design.  It illustrates
+//
+// - Building a C++ program to use the C library
+// - Basic class creation
+// - NO Streams
+// - NO Static constructor and destructors
+//
+/////////////////////////////////////////////////////////////////////////////
+
+/////////////////////////////////////////////////////////////////////////////
+// Included Files
+/////////////////////////////////////////////////////////////////////////////
+
+#include <cstdio>
+
+/////////////////////////////////////////////////////////////////////////////
+// Classes
+/////////////////////////////////////////////////////////////////////////////
+
+class CThingSayer
+{
+  const char *szWhatToSay;
+public:
+  CThingSayer(void)
+    {
+      printf("CThingSayer::CThingSayer: I am!\n");
+      szWhatToSay = (const char*)NULL;
+    }
+ 
+  ~CThingSayer(void)
+    {
+      printf("CThingSayer::~CThingSayer: I cease to be\n");
+      if (szWhatToSay)
+	{
+	  printf("CThingSayer::~CThingSayer: I will never say '%s' again\n",
+		 szWhatToSay);
+	}
+      szWhatToSay = (const char*)NULL;
+    }
+
+  void Initialize(const char *czSayThis)
+    {
+      printf("CThingSayer::Initialize: When told, I will say '%s'\n",
+	     czSayThis);
+      szWhatToSay = czSayThis;
+    }
+
+  void SayThing(void)
+    {
+      printf("CThingSayer::SayThing: I am now saying '%s'\n", szWhatToSay);
+    }
+};
+
+/////////////////////////////////////////////////////////////////////////////
+// Public Functions
+/////////////////////////////////////////////////////////////////////////////
+
+int main(int argc, char **argv)
+{
+  CThingSayer *MyThingSayer;
+
+  printf("main: Started.  Creating MyThingSayer\n");
+
+  // Create an instance of the CThingSayer class
+  // We should see the message from constructor, CThingSayer::CThingSayer(),
+
+  MyThingSayer = new CThingSayer;
+  printf("main: Created MyThingSayer=0x%08lx\n", (long)MyThingSayer);
+
+  // Tell MyThingSayer that "Hello, World!" is the string to be said
+
+  printf("main: Calling MyThingSayer->Initialize\n");;
+  MyThingSayer->Initialize("Hello, World!");
+
+  // Tell MyThingSayer to say the thing we told it to say
+
+  printf("main: Calling MyThingSayer->SayThing\n");;
+  MyThingSayer->SayThing();
+
+  // We should see the message from the destructor,
+  // CThingSayer::~CThingSayer(), AFTER we see the following
+
+  printf("main: Destroying MyThingSayer\n");
+  delete MyThingSayer;
+
+  printf("main: Returning\n");;
+  return 0;
+}