How to use this macro in my cpp program?

Question

I have following macro with me. I am getting error while using this macro. If you observe it has no end bracket for schema::schema() . This is my macro header file.

#ifdef _WINDOWS_SOURCE #define ExportedByVX0TOOLS __declspec(dllexport) #else #define ExportedByVX0TOOLS #endif #include <stdio.h> #include <string.h> // #if defined(_WINDOWS_SOURCE) #include <errno.h> #include <io.h> #endif #if defined(_IRIX_SOURCE) || defined(_SUNOS_SOURCE) || defined(_HPUX_SOURCE) || defined(_AIX) #include <stdlib.h> #include <sys/stat.h> #include <unistd.h> #endif #define LoadSchemaDico(schema)\ class ExportedByVX0TOOLS schema { public: schema();};\ extern "C" ExportedByVX0TOOLS int fctCreate##schema();\ int fctCreate##schema(){ int ret=1 ; return ret; }\ schema::schema(){

How are you using the macro as of now?

another.anon.coward
– another.anon.coward

2011-11-30 08:38:35 +00:00
Commented Nov 30, 2011 at 8:38 — another.anon.coward
– another.anon.coward, Commented Nov 30, 2011 at 8:38
With some trepidation, I imagine!

johnsyweb
– johnsyweb

2011-11-30 08:39:10 +00:00
Commented Nov 30, 2011 at 8:39 — johnsyweb
– johnsyweb, Commented Nov 30, 2011 at 8:39

Luchian Grigore · Accepted Answer · 2011-11-30 08:42:54Z

1

You can use it like so:

LoadSchemaDico(name) //constructor code }

Which will expand to:

class ExportedByVX0TOOLS name { public: name(); }; extern "C" ExportedByVX0TOOLS int fctCreatename(); int fctCreatename() { int ret=1 ; return ret; } name::name() { //constructor code }

answered Nov 30, 2011 at 8:42

Luchian Grigore

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4 Comments

user1061293 Over a year ago

If i want to create the object for this expanded schema to c++ class, how can i do that??

Luchian Grigore Over a year ago

@user1061293 you can just do "name obj;" or "name* obj = new name;", replacing name with the name of your class.

user1061293 Over a year ago

Thanks..But if i want to retrieve the name of the generated class at runtime, how can i do that..Usually we knows the name, because we give it. But i want to retrieve it run time like dynamic loading..

Luchian Grigore Over a year ago

@user1061293 In this way, you can't. C++ doesn't support reflection. What might help you is the abstract factory design patter, might want to look into that.

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