BOOST_STATIC_ASSERT question

From: Beman Dawes (bdawes_at_[hidden])
Date: 2001-05-24 10:39:30

This program works as expected with the GNU, Metrowerks, and Microsoft 
compilers:

#include <iostream>
#include <boost/static_assert.hpp>

template< typename T >
void f( T & t )
{
   std::cout << sizeof(T) << "\n";
   BOOST_STATIC_ASSERT( sizeof(T) );  // line in question
}

int main()
{
   long l;
   f(l);
   return 0;
}

With the Borland 5.5.1 and Intel 5.0 compilers, the BOOST_STATIC_ASSERT 
fails:

Borland:
Error E2450 c:/boost/site/libs/smart_ptr/test.cpp 8: Undefined structure 
'boost:
:STATIC_ASSERTION_FAILURE<4>' in function f<long>(long &)
Error E2109 c:/boost/site/libs/smart_ptr/test.cpp 8: Not an allowed type in 
func
tion f<long>(long &)

Intel:
c:/boost/site/libs/smart_ptr/test.cpp(8) : error #70: incomplete type is 
not allowed
     BOOST_STATIC_ASSERT( sizeof(T) );
     ^
           detected during instantiation of "void f(T &) [with T=long]"

Are these compilers wrong, or is there a problem with BOOST_STATIC_ASSERT?

(Both produce the expected output if the line in question is commented 
out.)

--Beman