Problem with Expilicit Instantiation using const

Question

Hello All,
I have a global template function
template <typename T> int getValue(T t);
defined in file "a.h"
I am trying to do explicit instantiation of this function in "b.h" like this:
#include "a.h"
struct B;
template <> int getValue<const B&>(const B& t);
where "B" is any Structure.
Definition of above function is present in "b.C" as:
template<> int getValue<const B&>(const B& t)
     return t.getIntValue();
getIntValue() defined in Struct B returns int identifier of that object.
On Compiling this code using Forte Compiler 5.3 update 2 i am getting following Errors.
>>
/opt/SUNWspro/bin/../WS6U2/bin/CC -g -c -o output/main.o
main.C
main.C:
*** Error code 1
"b.h", line 3: Error: No match found to do explicit
instantation of type int(const B&).
1 Error(s) detected.
dmake: Fatal error: Command failed for target `output/main.o'
<<
Can anybody tell me what can be the problem. One thing to note is that same code use to compile using Forte 5.3 update 1.
Also if I remove const declaration in explicit instantiation the code compiles.
Please respond ASAP.
Best Regards,
Sanyam

Answer 1

The compiler does not generate template instances that are already in libCstd, which is linked by default to programs. Instead of trying to force those instances into your shared library, you should build your library with a dependency on libCstd.
Remember that no system libraries are referenced automatically when you create a shared library -- you have to mention them explicitly. Normally you want to link against libCstd, libCrun, libm and libc. Refer to the C++ User's Guide that comes with the compiler, the "Building Libraries" chapter.