codedFunctionObject: Updated documentation

Patch contributed by Bruno Santos
Resolves bug-report https://bugs.openfoam.org/view.php?id=2441

src/functionObjects/utilities/codedFunctionObject/codedFunctionObject.C

@@ -2,7 +2,7 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
-    \\  /    A nd           | Copyright (C) 2011-2016 OpenFOAM Foundation
+    \\  /    A nd           | Copyright (C) 2011-2017 OpenFOAM Foundation
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
 License
@@ -284,6 +284,16 @@ bool Foam::codedFunctionObject::read(const dictionary& dict)
         );
     }
 
+    if(!dataPtr && !readPtr && !execPtr && !writePtr && !endPtr)
+    {
+        IOWarningInFunction
+        (
+            dict
+        )   << "No critical \"code\" prefixed keywords were found."
+            << " Please check the code documentation for more details."
+            << nl << endl;
+    }
+
     updateLibrary(name_);
     return redirectFunctionObject().read(dict);
 }

src/functionObjects/utilities/codedFunctionObject/codedFunctionObject.H

@@ -2,7 +2,7 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
-    \\  /    A nd           | Copyright (C) 2011-2016 OpenFOAM Foundation
+    \\  /    A nd           | Copyright (C) 2011-2017 OpenFOAM Foundation
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
 License
@@ -30,16 +30,18 @@ Group
 Description
     Provides a general interface to enable dynamic code compilation.
 
-    The entries are
-        codeInclude : include files
-        codeOptions : include paths; inserted into EXE_INC in Make/options
-        codeLibs    : link line; inserted into LIB_LIBS in Make/options
-        codeData    : c++; local member data (null constructed);
-        localCode   : c++; local static functions
-        codeRead    : c++; upon functionObject::read();
-        codeExecute : c++;upon functionObject::execute();
-        codeWrite   : c++; upon functionObject::write()
-        codeEnd     : c++; upon functionObject::end();
+    The entries are:
+    \plaintable
+       codeInclude | include files
+       codeOptions | include paths; inserted into EXE_INC in Make/options
+       codeLibs    | link line; inserted into LIB_LIBS in Make/options
+       codeData    | c++; local member data (null constructed);
+       localCode   | c++; local static functions;
+       codeRead    | c++; upon functionObject::read();
+       codeExecute | c++; upon functionObject::execute();
+       codeWrite   | c++; upon functionObject::write()
+       codeEnd     | c++; upon functionObject::end();
+    \endplaintable
 
     Example of function object specification:
     \verbatim