Re: [Boost-users] Variable-length template argument lists in C++03?

10 Jul 2008


      AMDG

Robert Dailey wrote:
...
Hi,
Is there a way that I can provide variable length template argument 
lists in C++03 using boost? An example of what I want to achieve is below:
template< typename t1, typename t2, ..., typename tN >
void MyFunction( t1 param1, t2 param2, ..., tN paramN )
{
    boost::tuple myTuple;
    AnotherFunction( param1, param2, ..., paramN );
}
Right now to do this I have to create several class specializations 
which gets very nasty. Help is appreciated. Thanks.
The easiest way to do it is using the preprocessor:

// scratch.cpp
#ifndef BOOST_PP_IS_ITERATING

#include 
#include 
#include 
#include 

#define BOOST_PP_FILENAME_1 "scratch.cpp"
#define BOOST_PP_ITERATION_LIMITS (1, 5)

#include BOOST_PP_ITERATE()

#else

template
void MyFunction(BOOST_PP_ENUM_BINARY_PARAMS(BOOST_PP_ITERATION(), const 
T, &t)) {
    boost::tuple myTuple;
    AnotherFunction(BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(), t));
}

#endif

In Christ,
Steven Watanabe