Johan Råde wrote:
There are three problems:
1. The linking problem has been fixed in the latest version. (Or did you have the latest version and just forgot to compile long_double_mask.cpp?)
The latter.
2. A slightly different binary representation of long double than I had expected. Is there any preprocessor symbol that I can use to detect Alpha processors?
Stolen from numeric/interval/detail/alpha_rounding_control.hpp: #if !defined(alpha) && !defined(__alpha__) #error This header only works on Alpha CPUs. #endif This works on GCC and CXX.
3. Your <limits> header is a bit funny. numeric_limits<T>::quiet_NaN() returns a NaN with the signbit set. This triggered the assertion. (Does it matter? Maybe. According to C99, positive NaN should be written to text files as "nan" or "+nan" and negative NaN as "-nan". And this will probably be part of C++0x as well.)
Commenting out the two assert on line 222 and 230 gives: bash-2.05b$ cxx -ieee -std strict_ansi -model ansi -no_pure_cname -I /boost/regression/boost test.cpp ../long_double_mask.cpp -lm && ./a.out test.cpp: ../long_double_mask.cpp: little endian sizeof(long double) = 16 mask<long double>::sign = 80000000 mask<long double>::exponent = 00000000 mask<long double>::significand = 00000000 mask<long double>::fraction = ffffffff Testing float Assertion failed: (copysign)(x, y) == x, file test.cpp, line 281 IOT/Abort trap Seems there is generally something odd with the sign bit handling. Markus