Hi!
Please check the following code. My aim is to write a macro, which is
able to do explicit template instantiation.
NOTE: The example is basic, of course. The original code has much more
lines, so the usage of #define is really important for me.
*************
#define COMMA ,
#define EXP_INST_COMMON(x) \
template class x;
#define EXP_INST_SPECIFIC(x, y) \
template class somefunc< x >( y ); \
EXP_INST_COMMON(x)
/* .... */
EXP_INST_2(someClass<int COMMA double>, long)
*************
I could construct a more meaningful example. However, the code would
only get confusing.
The problem in this is example is, that EXP_INST_COMMON will be called
with two argument, because the COMMA is resolved before.
I found a solution for other compilers (MSVC, Borland C++):
*************
#define EXP_INST_SPECIFIC(x, y) \
template class somefunc< x >( y ); \
EXP_INST_COMMON( ##x## )
*************
Somehow, "x" is considered as token there, and "," can be passed as
token again. I don't know exactly, but it works.
However, g++ is trying to tokenize "x" with "(" and ")". This is not a
valid token, so g++ throws an error. I know, that this behavior is
correct, but the sad thing is, that I have no working solution any
more :(
Using the other workaround (using parenthesis instead of COMMA)
doesn't work for this code:
EXP_INST_2((someClass<int COMMA double>), long)
would expand to:
template class (someClass<int COMMA double>);
C++ compiler do not like that ;)
There MUST be a solution... please help!
Greetings,
Kirsten
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