How to sub a C++ class from a .so on Linux?

Question

I am using the ACE library to do some reactor jobs. On linux ,the default ACE compile output is the libACE.so. I usually to compilte it with the -lACE compile option, but this rely on whether i have configured the libACE.conf in ld.so.conf.d directory. If I want to sub class ACE_Task,which could be imported from ACE.so , the compile rely on the libACE.so, if I want to dynamic load the ACE.so , how can i do this? I have tried, if i use dlopen , then the link error occurs. so ,is there any way to load ACE.so dynamically and still can implement the ACE_Task like this?

class test: public ACE_Task<ACE_MT_SYNCH> { }

I have configured it with the ld.so.conf，this is fine with compile,but when i want to release all the files on another PC, i have to configure the ld.so.conf， Is there any way to sub-classing a class which is the from .so file and i can still load it at run time? — lovecpp
– lovecpp, Commented Dec 7, 2012 at 11:58

Basile Starynkevitch · Accepted Answer · 2012-12-07 10:06:28Z

Sub-classing happens mostly at compilation time. You need to have the super-class[es] appropriately defined in some header file[s].

At runtime, what matters is the availability of vtables and inherited member functions (and perhaps RTTI).

You probably want to link the libACE.so to your shared object (the dlopen-ed thing you are building). This is possible with eg g++ -rdynamic -shared your*.pic.o -lACE -o yoursharedobject.so

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