id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
8272	BOOST_REQUIRE_CLOSE fails to compile with boost::multiprecision::cpp_dec_float_100	Ken Smith <kgsmith@…>	Gennadiy Rozental	"Environment:
- Linux 3.7.9-2-ARCH
- G++ 4.7.2
- Issue reproduces with Boost SVN trunk

This code:

{{{
#define BOOST_TEST_MAIN
#include <boost/test/included/unit_test.hpp>
#include <boost/test/floating_point_comparison.hpp>
#include <boost/multiprecision/cpp_dec_float.hpp>

BOOST_AUTO_TEST_CASE(multiprecision_closeness)
{
   using num_t = boost::multiprecision::cpp_dec_float_100;

   num_t a(""1.0000000000000000000000000000001"");
   num_t b(1);
   num_t thresh(1e-15);

   BOOST_REQUIRE_CLOSE(a, b, thresh);
}

}}}

Generates the following compilation error:

{{{
g++ -std=gnu++11 -g -Iboost-trunk -o prog repro.cpp
In file included from boost-trunk/boost/test/tools/old/impl.hpp:21:0,
                 from boost-trunk/boost/test/test_tools.hpp:32,
                 from boost-trunk/boost/test/impl/exception_safety.ipp:35,
                 from boost-trunk/boost/test/included/unit_test.hpp:22,
                 from repro.cpp:2:
boost-trunk/boost/test/tools/floating_point_comparison.hpp: In instantiation of ‘FPT boost::math::fpc::fpc_detail::fpt_abs(FPT) [with FPT = boost::multiprecision::detail::expression<boost::multiprecision::detail::subtract_immediates, boost::multiprecision::number<boost::multiprecision::backends::cpp_dec_float<100u> >, boost::multiprecision::number<boost::multiprecision::backends::cpp_dec_float<100u> >, void, void>]’:
boost-trunk/boost/test/tools/floating_point_comparison.hpp:207:67:   required from ‘bool boost::math::fpc::close_at_tolerance<FPT>::operator()(FPT, FPT) const [with FPT = boost::multiprecision::number<boost::multiprecision::backends::cpp_dec_float<100u> >]’
boost-trunk/boost/test/tools/old/impl.hpp:292:50:   required from ‘boost::test_tools::assertion_result boost::test_tools::check_is_close_t::operator()(FPT1, FPT2, ToleranceType) const [with FPT1 = boost::multiprecision::number<boost::multiprecision::backends::cpp_dec_float<100u> >; FPT2 = boost::multiprecision::number<boost::multiprecision::backends::cpp_dec_float<100u> >; ToleranceType = boost::math::fpc::percent_tolerance_t<boost::multiprecision::number<boost::multiprecision::backends::cpp_dec_float<100u> > >]’
boost-trunk/boost/test/tools/old/impl.hpp:91:1:   required from ‘bool boost::test_tools::tt_detail::check_frwd(Pred, const boost::unit_test::lazy_ostream&, boost::unit_test::const_string, std::size_t, boost::test_tools::tt_detail::tool_level, boost::test_tools::tt_detail::check_type, const Arg0&, const char*, const Arg1&, const char*, const Arg2&, const char*) [with Pred = boost::test_tools::check_is_close_t; Arg0 = boost::multiprecision::number<boost::multiprecision::backends::cpp_dec_float<100u> >; Arg1 = boost::multiprecision::number<boost::multiprecision::backends::cpp_dec_float<100u> >; Arg2 = boost::math::fpc::percent_tolerance_t<boost::multiprecision::number<boost::multiprecision::backends::cpp_dec_float<100u> > >; boost::unit_test::const_string = boost::unit_test::basic_cstring<const char>; std::size_t = long unsigned int]’
repro.cpp:14:1:   required from here
boost-trunk/boost/test/tools/floating_point_comparison.hpp:59:47: error: no matching function for call to ‘boost::multiprecision::detail::expression<boost::multiprecision::detail::subtract_immediates, boost::multiprecision::number<boost::multiprecision::backends::cpp_dec_float<100u> >, boost::multiprecision::number<boost::multiprecision::backends::cpp_dec_float<100u> >, void, void>::expression(int)’
boost-trunk/boost/test/tools/floating_point_comparison.hpp:59:47: note: candidates are:
In file included from boost-trunk/boost/multiprecision/detail/default_ops.hpp:10:0,
                 from boost-trunk/boost/multiprecision/detail/generic_interconvert.hpp:9,
                 from boost-trunk/boost/multiprecision/number.hpp:22,
                 from boost-trunk/boost/multiprecision/cpp_dec_float.hpp:28,
                 from repro.cpp:4:
boost-trunk/boost/multiprecision/detail/number_base.hpp:379:4: note: boost::multiprecision::detail::expression<tag, Arg1, Arg2, void, void>::expression(const Arg1&, const Arg2&) [with tag = boost::multiprecision::detail::subtract_immediates; Arg1 = boost::multiprecision::number<boost::multiprecision::backends::cpp_dec_float<100u> >; Arg2 = boost::multiprecision::number<boost::multiprecision::backends::cpp_dec_float<100u> >]
boost-trunk/boost/multiprecision/detail/number_base.hpp:379:4: note:   candidate expects 2 arguments, 1 provided
boost-trunk/boost/multiprecision/detail/number_base.hpp:369:8: note: constexpr boost::multiprecision::detail::expression<boost::multiprecision::detail::subtract_immediates, boost::multiprecision::number<boost::multiprecision::backends::cpp_dec_float<100u> >, boost::multiprecision::number<boost::multiprecision::backends::cpp_dec_float<100u> >, void, void>::expression(const boost::multiprecision::detail::expression<boost::multiprecision::detail::subtract_immediates, boost::multiprecision::number<boost::multiprecision::backends::cpp_dec_float<100u> >, boost::multiprecision::number<boost::multiprecision::backends::cpp_dec_float<100u> >, void, void>&)
boost-trunk/boost/multiprecision/detail/number_base.hpp:369:8: note:   no known conversion for argument 1 from ‘int’ to ‘const boost::multiprecision::detail::expression<boost::multiprecision::detail::subtract_immediates, boost::multiprecision::number<boost::multiprecision::backends::cpp_dec_float<100u> >, boost::multiprecision::number<boost::multiprecision::backends::cpp_dec_float<100u> >, void, void>&’
make: *** [prog] Error 1
}}}

At line 59 of floating_point_comparison.hpp, FPT appears to be an expression template and doesn't suffer the static cast."	Bugs	closed	Boost 1.59.0	test	Boost 1.53.0	Problem	fixed	test multiprecision check_is_close is_close_to	pbristow@…