C++ Template Class Constructor with Variable Arguments
- by david
Is it possible to create a template function that takes a variable number of arguments, for example, in this Vector< T, C class constructor:
template < typename T, uint C >
Vector< T, C >::Vector( T, ... )
{
assert( C > 0 );
va_list arg_list;
va_start( arg_list, C );
for( uint i = 0; i < C; i++ ) {
m_data[ i ] = va_arg( arg_list, T );
}
va_end( arg_list );
}
This almost works, but if someone calls Vector< double, 3 ( 1, 1, 1 ), only the first argument has the correct value. I suspect that the first parameter is correct because it is cast to a double during the function call, and that the others are interpreted as ints and then the bits are stuffed into a double. Calling Vector< double, 3 ( 1.0, 1.0, 1.0 ) gives the desired results. Is there a preferred way to do something like this?
