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Boost Users : |
Subject: Re: [Boost-users] [boost][multiprecision] compile error with gcc 4.8.4
From: John Maddock (jz.maddock_at_[hidden])
Date: 2016-09-17 07:48:48
On 17/09/2016 11:59, John Maddock wrote:
>
>
> On 16/09/2016 19:50, Rob Conde wrote:
>>
>> The first case (int -> float) was fixed, but the second (float->int)
>> wasn't.
>>
>
> Oh :(
>
> I fear this may have to stay broken for this release - what I need to
> do is devise a test case that tests conversion of
> everything-to-everything - and that's going to be a lot of permutations!
On second thoughts, the second case (float -> int) is a conversion we
have never supported (unsafe/lossy) - which is to say this is by
design. That said, we have always supported conversion to native
(built-in) integer types, so we're inconsistent there.
John.
>
>
> John.
>
>>
>> Rob
>>
>> ------------------------------------------------------------------------
>> *From:* Boost-users <boost-users-bounces_at_[hidden]> on behalf
>> of John Maddock <jz.maddock_at_[hidden]>
>> *Sent:* Friday, September 16, 2016 7:54:26 AM
>> *To:* boost-users_at_[hidden]
>> *Subject:* Re: [Boost-users] [boost][multiprecision] compile error
>> with gcc 4.8.4
>>
>>
>> On 15/09/2016 17:20, Rob Conde wrote:
>> >
>> > I tried with 1.62 beta and ran into the following problems:
>> >
>>
>> I think this fixes these:
>> https://github.com/boostorg/multiprecision/commit/b2108867c7415cc1ed28244843555289fdb8d356
>>
>>
>> Or at least it does for me, can you verify with your setup as well
>> please?
>>
>> Whether there is time for this to make 1.62 is another matter....
>>
>> John.
>>
>> >
>> > Building with std=c++98 for the following case:
>> >
>> >
>> >
>> --------------------------------------------------------------------------------
>> >
>> > #include <boost/multiprecision/cpp_int.hpp>
>> > #include <boost/multiprecision/cpp_bin_float.hpp>
>> >
>> > typedef boost::multiprecision::int128_t int128_t;
>> > typedef boost::multiprecision::cpp_bin_float_quad float128_t;
>> >
>> > void func()
>> > {
>> > int128_t iVal;
>> > float128_t floatVal(iVal.convert_to<float128_t>());
>> > }
>> >
>> --------------------------------------------------------------------------------
>> >
>> > In file included from
>> > ./boost/type_traits/detail/common_type_impl.hpp:12:0,
>> > from ./boost/type_traits/common_type.hpp:18,
>> > from ./boost/multiprecision/cpp_int.hpp:22,
>> > from mpTest.cpp:1:
>> > ./boost/type_traits/detail/common_arithmetic_type.hpp: In
>> > instantiation of ‘class
>> >
>> boost::type_traits_detail::common_arithmetic_type<boost::multiprecision::number<boost::multiprecision::backends::cpp_bin_float<113u,
>> > (boost::multiprecision::backends::digit_base_type)2u, void, short int,
>> > -16382, 16383>,
>> > (boost::multiprecision::expression_template_option)0u>, __int128
>> > unsigned>’:
>> > ./boost/type_traits/detail/common_type_impl.hpp:99:35: required from
>> > ‘struct
>> >
>> boost::type_traits_detail::common_type_impl5<boost::multiprecision::number<boost::multiprecision::backends::cpp_bin_float<113u,
>> > (boost::multiprecision::backends::digit_base_type)2u, void, short int,
>> > -16382, 16383>,
>> > (boost::multiprecision::expression_template_option)0u>, __int128
>> > unsigned>’
>> > ./boost/type_traits/detail/common_type_impl.hpp:90:35: required from
>> > ‘struct
>> >
>> boost::type_traits_detail::common_type_impl4<boost::multiprecision::number<boost::multiprecision::backends::cpp_bin_float<113u,
>> > (boost::multiprecision::backends::digit_base_type)2u, void, short int,
>> > -16382, 16383>,
>> > (boost::multiprecision::expression_template_option)0u>, __int128
>> > unsigned>’
>> > ./boost/type_traits/detail/common_type_impl.hpp:79:35: required from
>> > ‘struct
>> >
>> boost::type_traits_detail::common_type_impl3<boost::multiprecision::number<boost::multiprecision::backends::cpp_bin_float<113u,
>> > (boost::multiprecision::backends::digit_base_type)2u, void, short int,
>> > -16382, 16383>,
>> > (boost::multiprecision::expression_template_option)0u>, __int128
>> > unsigned>’
>> > ./boost/type_traits/detail/common_type_impl.hpp:52:35: required from
>> > ‘struct
>> >
>> boost::type_traits_detail::common_type_class<boost::multiprecision::number<boost::multiprecision::backends::cpp_bin_float<113u,
>> > (boost::multiprecision::backends::digit_base_type)2u, void, short int,
>> > -16382, 16383>,
>> > (boost::multiprecision::expression_template_option)0u>, __int128
>> > unsigned>’
>> > ./boost/type_traits/detail/common_type_impl.hpp:68:35: required from
>> > ‘struct
>> >
>> boost::type_traits_detail::common_type_impl<boost::multiprecision::number<boost::multiprecision::backends::cpp_bin_float<113u,
>> > (boost::multiprecision::backends::digit_base_type)2u, void, short int,
>> > -16382, 16383>,
>> > (boost::multiprecision::expression_template_option)0u>, __int128
>> > unsigned>’
>> > ./boost/type_traits/common_type.hpp:133:37: required from ‘struct
>> >
>> boost::type_traits_detail::common_type_decay_helper<boost::multiprecision::number<boost::multiprecision::backends::cpp_bin_float<113u,
>> > (boost::multiprecision::backends::digit_base_type)2u, void, short int,
>> > -16382, 16383>,
>> > (boost::multiprecision::expression_template_option)0u>, __int128
>> > unsigned,
>> >
>> boost::multiprecision::number<boost::multiprecision::backends::cpp_bin_float<113u,
>> > (boost::multiprecision::backends::digit_base_type)2u, void, short int,
>> > -16382, 16383>,
>> > (boost::multiprecision::expression_template_option)0u>, __int128
>> > unsigned>’
>> > ./boost/type_traits/common_type.hpp:139:37: required from ‘struct
>> >
>> boost::common_type<boost::multiprecision::number<boost::multiprecision::backends::cpp_bin_float<113u,
>> > (boost::multiprecision::backends::digit_base_type)2u, void, short int,
>> > -16382, 16383>,
>> > (boost::multiprecision::expression_template_option)0u>, __int128
>> > unsigned, void, void, void, void, void, void, void>’
>> > ./boost/multiprecision/cpp_int/misc.hpp:547:138: required from
>> > ‘typename
>> >
>> boost::enable_if_c<(boost::multiprecision::backends::is_trivial_cpp_int<boost::multiprecision::backends::cpp_int_backend<MinBits1,
>> > MaxBits1, SignType1, Checked1, Allocator1> >::value &&
>> >
>> boost::multiprecision::is_signed_number<boost::multiprecision::backends::cpp_int_backend<MinBits1,
>> > MaxBits1, SignType1, Checked1, Allocator1> >::value)>::type
>> > boost::multiprecision::backends::eval_convert_to(R*, const
>> > boost::multiprecision::backends::cpp_int_backend<MinBits1, MaxBits1,
>> > SignType1, Checked1, Allocator1>&) [with R =
>> >
>> boost::multiprecision::number<boost::multiprecision::backends::cpp_bin_float<113u,
>> > (boost::multiprecision::backends::digit_base_type)2u, void, short int,
>> > -16382, 16383>,
>> > (boost::multiprecision::expression_template_option)0u>; unsigned int
>> > MinBits1 = 128u; unsigned int MaxBits1 = 128u;
>> > boost::multiprecision::cpp_integer_type SignType1 =
>> > (boost::multiprecision::cpp_integer_type)1u;
>> > boost::multiprecision::cpp_int_check_type Checked1 =
>> > (boost::multiprecision::cpp_int_check_type)0u; Allocator1 = void;
>> > typename
>> >
>> boost::enable_if_c<(boost::multiprecision::backends::is_trivial_cpp_int<boost::multiprecision::backends::cpp_int_backend<MinBits1,
>> > MaxBits1, SignType1, Checked1, Allocator1> >::value &&
>> >
>> boost::multiprecision::is_signed_number<boost::multiprecision::backends::cpp_int_backend<MinBits1,
>> > MaxBits1, SignType1, Checked1, Allocator1> >::value)>::type = void]’
>> > ./boost/multiprecision/number.hpp:585:40: required from ‘void
>> > boost::multiprecision::number<Backend,
>> > ExpressionTemplates>::convert_to_imp(T*) const [with T =
>> >
>> boost::multiprecision::number<boost::multiprecision::backends::cpp_bin_float<113u,
>> > (boost::multiprecision::backends::digit_base_type)2u, void, short int,
>> > -16382, 16383>,
>> > (boost::multiprecision::expression_template_option)0u>; Backend =
>> > boost::multiprecision::backends::cpp_int_backend<128u, 128u,
>> > (boost::multiprecision::cpp_integer_type)1u,
>> > (boost::multiprecision::cpp_int_check_type)0u, void>;
>> > boost::multiprecision::expression_template_option ExpressionTemplates
>> > = (boost::multiprecision::expression_template_option)0u]’
>> > ./boost/multiprecision/number.hpp:601:29: required from ‘T
>> > boost::multiprecision::number<Backend,
>> > ExpressionTemplates>::convert_to() const [with T =
>> >
>> boost::multiprecision::number<boost::multiprecision::backends::cpp_bin_float<113u,
>> > (boost::multiprecision::backends::digit_base_type)2u, void, short int,
>> > -16382, 16383>,
>> > (boost::multiprecision::expression_template_option)0u>; Backend =
>> > boost::multiprecision::backends::cpp_int_backend<128u, 128u,
>> > (boost::multiprecision::cpp_integer_type)1u,
>> > (boost::multiprecision::cpp_int_check_type)0u, void>;
>> > boost::multiprecision::expression_template_option ExpressionTemplates
>> > = (boost::multiprecision::expression_template_option)0u]’
>> > mpTest.cpp:11:52: required from here
>> > ./boost/type_traits/detail/common_arithmetic_type.hpp:211:60: error:
>> > no match for ternary ‘operator?:’ (operand types are ‘bool’,
>> >
>> ‘boost::multiprecision::number<boost::multiprecision::backends::cpp_bin_float<113u,
>> > (boost::multiprecision::backends::digit_base_type)2u, void, short int,
>> > -16382, 16383>,
>> > (boost::multiprecision::expression_template_option)0u>’, and ‘__int128
>> > unsigned’)
>> > typedef typename arithmetic_type< sizeof(select( cond()? T(): U()
>> > )) >::type type;
>> >
>> >
>> >
>> > Building without a std specified I get the following case:
>> >
>> >
>> >
>> --------------------------------------------------------------------------------
>> >
>> > #include <boost/multiprecision/cpp_int.hpp>
>> > #include <boost/multiprecision/cpp_bin_float.hpp>
>> >
>> > typedef boost::multiprecision::int128_t int128_t;
>> > typedef boost::multiprecision::cpp_bin_float_quad float128_t;
>> >
>> > void func()
>> > {
>> > float128_t floatVal;
>> >
>> > int128_t roundedNanoseconds(floatVal.convert_to<int128_t>());
>> > }
>> >
>> --------------------------------------------------------------------------------
>> >
>> > In file included from
>> > ./boost/multiprecision/detail/generic_interconvert.hpp:9:0,
>> > from ./boost/multiprecision/number.hpp:22,
>> > from ./boost/multiprecision/cpp_int.hpp:12,
>> > from mpTest.cpp:1:
>> > ./boost/multiprecision/detail/default_ops.hpp: In instantiation of
>> > ‘void
>> >
>> boost::multiprecision::default_ops::eval_convert_to(boost::multiprecision::default_ops::terminal<boost::multiprecision::number<B1,
>> > et> >*, const B2&) [with B1 =
>> > boost::multiprecision::backends::cpp_int_backend<128u, 128u,
>> > (boost::multiprecision::cpp_integer_type)1u,
>> > (boost::multiprecision::cpp_int_check_type)0u, void>; B2 =
>> > boost::multiprecision::backends::cpp_bin_float<113u,
>> > (boost::multiprecision::backends::digit_base_type)2u, void, short int,
>> > -16382, 16383>; boost::multiprecision::expression_template_option et =
>> > (boost::multiprecision::expression_template_option)0u]’:
>> > ./boost/multiprecision/detail/default_ops.hpp:896:31: required from
>> > ‘void boost::multiprecision::default_ops::eval_convert_to(R*, const
>> > B&) [with R =
>> >
>> boost::multiprecision::number<boost::multiprecision::backends::cpp_int_backend<128u,
>> > 128u, (boost::multiprecision::cpp_integer_type)1u,
>> > (boost::multiprecision::cpp_int_check_type)0u, void> >; B =
>> > boost::multiprecision::backends::cpp_bin_float<113u,
>> > (boost::multiprecision::backends::digit_base_type)2u, void, short int,
>> > -16382, 16383>]’
>> > ./boost/multiprecision/number.hpp:585:40: required from ‘void
>> > boost::multiprecision::number<Backend,
>> > ExpressionTemplates>::convert_to_imp(T*) const [with T =
>> >
>> boost::multiprecision::number<boost::multiprecision::backends::cpp_int_backend<128u,
>> > 128u, (boost::multiprecision::cpp_integer_type)1u,
>> > (boost::multiprecision::cpp_int_check_type)0u, void> >; Backend =
>> > boost::multiprecision::backends::cpp_bin_float<113u,
>> > (boost::multiprecision::backends::digit_base_type)2u, void, short int,
>> > -16382, 16383>; boost::multiprecision::expression_template_option
>> > ExpressionTemplates =
>> > (boost::multiprecision::expression_template_option)0u]’
>> > ./boost/multiprecision/number.hpp:601:29: required from ‘T
>> > boost::multiprecision::number<Backend,
>> > ExpressionTemplates>::convert_to() const [with T =
>> >
>> boost::multiprecision::number<boost::multiprecision::backends::cpp_int_backend<128u,
>> > 128u, (boost::multiprecision::cpp_integer_type)1u,
>> > (boost::multiprecision::cpp_int_check_type)0u, void> >; Backend =
>> > boost::multiprecision::backends::cpp_bin_float<113u,
>> > (boost::multiprecision::backends::digit_base_type)2u, void, short int,
>> > -16382, 16383>; boost::multiprecision::expression_template_option
>> > ExpressionTemplates =
>> > (boost::multiprecision::expression_template_option)0u]’
>> > mpTest.cpp:11:62: required from here
>> > ./boost/multiprecision/detail/default_ops.hpp:922:134: error: no
>> > matching function for call to
>> >
>> ‘generic_interconvert(boost::multiprecision::backends::cpp_int_backend<128u,
>>
>> > 128u, (boost::multiprecision::cpp_integer_type)1u,
>> > (boost::multiprecision::cpp_int_check_type)0u, void>&, const
>> > boost::multiprecision::backends::cpp_bin_float<113u,
>> > (boost::multiprecision::backends::digit_base_type)2u, void, short int,
>> > -16382, 16383>&,
>> >
>> boost::multiprecision::number_category<boost::multiprecision::backends::cpp_int_backend<128u,
>> > 128u, (boost::multiprecision::cpp_integer_type)1u,
>> > (boost::multiprecision::cpp_int_check_type)0u, void> >,
>> >
>> boost::multiprecision::number_category<boost::multiprecision::backends::cpp_bin_float<113u,
>> > (boost::multiprecision::backends::digit_base_type)2u, void, short int,
>> > -16382, 16383> >)’
>> >
>> boost::multiprecision::detail::generic_interconvert(result->value.backend(),
>>
>> > backend, number_category<B1>(), number_category<B2>());
>> > ^
>> > ./boost/multiprecision/detail/default_ops.hpp:922:134: note:
>> > candidates are:
>> > In file included from ./boost/multiprecision/number.hpp:22:0,
>> > from ./boost/multiprecision/cpp_int.hpp:12,
>> > from mpTest.cpp:1:
>> > ./boost/multiprecision/detail/generic_interconvert.hpp:30:6: note:
>> > template<class To, class From> void
>> > boost::multiprecision::detail::generic_interconvert(To&, const From&,
>> > const mpl_::int_<1>&, const mpl_::int_<0>&)
>> > void generic_interconvert(To& to, const From& from, const
>> > mpl::int_<number_kind_floating_point>& /*to_type*/, const
>> > mpl::int_<number_kind_integer>& /*from_type*/)
>> > ^
>> > ./boost/multiprecision/detail/generic_interconvert.hpp:30:6: note:
>> > template argument deduction/substitution failed:
>> > In file included from
>> > ./boost/multiprecision/detail/generic_interconvert.hpp:9:0,
>> > from ./boost/multiprecision/number.hpp:22,
>> > from ./boost/multiprecision/cpp_int.hpp:12,
>> > from mpTest.cpp:1:
>> > ./boost/multiprecision/detail/default_ops.hpp:922:134: note: cannot
>> > convert
>> >
>> ‘boost::multiprecision::number_category<boost::multiprecision::backends::cpp_int_backend<128u,
>> > 128u, (boost::multiprecision::cpp_integer_type)1u,
>> > (boost::multiprecision::cpp_int_check_type)0u, void> >()’ (type
>> >
>> ‘boost::multiprecision::number_category<boost::multiprecision::backends::cpp_int_backend<128u,
>> > 128u, (boost::multiprecision::cpp_integer_type)1u,
>> > (boost::multiprecision::cpp_int_check_type)0u, void> >’) to type
>> > ‘const mpl_::int_<1>&’
>> >
>> boost::multiprecision::detail::generic_interconvert(result->value.backend(),
>>
>> > backend, number_category<B1>(), number_category<B2>());
>> > ^
>> > In file included from ./boost/multiprecision/number.hpp:22:0,
>> > from ./boost/multiprecision/cpp_int.hpp:12,
>> > from mpTest.cpp:1:
>> > ./boost/multiprecision/detail/generic_interconvert.hpp:78:6: note:
>> > template<class To, class From> void
>> > boost::multiprecision::detail::generic_interconvert(To&, const From&,
>> > const mpl_::int_<0>&, const mpl_::int_<0>&)
>> > void generic_interconvert(To& to, const From& from, const
>> > mpl::int_<number_kind_integer>& /*to_type*/, const
>> > mpl::int_<number_kind_integer>& /*from_type*/)
>> > ^
>> > ./boost/multiprecision/detail/generic_interconvert.hpp:78:6: note:
>> > template argument deduction/substitution failed:
>> > In file included from
>> > ./boost/multiprecision/detail/generic_interconvert.hpp:9:0,
>> > from ./boost/multiprecision/number.hpp:22,
>> > from ./boost/multiprecision/cpp_int.hpp:12,
>> > from mpTest.cpp:1:
>> > ./boost/multiprecision/detail/default_ops.hpp:922:134: note: cannot
>> > convert
>> >
>> ‘boost::multiprecision::number_category<boost::multiprecision::backends::cpp_bin_float<113u,
>> > (boost::multiprecision::backends::digit_base_type)2u, void, short int,
>> > -16382, 16383> >()’ (type
>> >
>> ‘boost::multiprecision::number_category<boost::multiprecision::backends::cpp_bin_float<113u,
>> > (boost::multiprecision::backends::digit_base_type)2u, void, short int,
>> > -16382, 16383> >’) to type ‘const mpl_::int_<0>&’
>> >
>> boost::multiprecision::detail::generic_interconvert(result->value.backend(),
>>
>> > backend, number_category<B1>(), number_category<B2>());
>> > ^
>> > In file included from ./boost/multiprecision/number.hpp:22:0,
>> > from ./boost/multiprecision/cpp_int.hpp:12,
>> > from mpTest.cpp:1:
>> > ./boost/multiprecision/detail/generic_interconvert.hpp:126:6: note:
>> > template<class To, class From> void
>> > boost::multiprecision::detail::generic_interconvert(To&, const From&,
>> > const mpl_::int_<1>&, const mpl_::int_<1>&)
>> > void generic_interconvert(To& to, const From& from, const
>> > mpl::int_<number_kind_floating_point>& /*to_type*/, const
>> > mpl::int_<number_kind_floating_point>& /*from_type*/)
>> > ^
>> > ./boost/multiprecision/detail/generic_interconvert.hpp:126:6: note:
>> > template argument deduction/substitution failed:
>> > In file included from
>> > ./boost/multiprecision/detail/generic_interconvert.hpp:9:0,
>> > from ./boost/multiprecision/number.hpp:22,
>> > from ./boost/multiprecision/cpp_int.hpp:12,
>> > from mpTest.cpp:1:
>> > ./boost/multiprecision/detail/default_ops.hpp:922:134: note: cannot
>> > convert
>> >
>> ‘boost::multiprecision::number_category<boost::multiprecision::backends::cpp_int_backend<128u,
>> > 128u, (boost::multiprecision::cpp_integer_type)1u,
>> > (boost::multiprecision::cpp_int_check_type)0u, void> >()’ (type
>> >
>> ‘boost::multiprecision::number_category<boost::multiprecision::backends::cpp_int_backend<128u,
>> > 128u, (boost::multiprecision::cpp_integer_type)1u,
>> > (boost::multiprecision::cpp_int_check_type)0u, void> >’) to type
>> > ‘const mpl_::int_<1>&’
>> >
>> boost::multiprecision::detail::generic_interconvert(result->value.backend(),
>>
>> > backend, number_category<B1>(), number_category<B2>());
>> > ^
>> > In file included from ./boost/multiprecision/number.hpp:22:0,
>> > from ./boost/multiprecision/cpp_int.hpp:12,
>> > from mpTest.cpp:1:
>> > ./boost/multiprecision/detail/generic_interconvert.hpp:209:6: note:
>> > template<class To, class From> void
>> > boost::multiprecision::detail::generic_interconvert(To&, const From&,
>> > const mpl_::int_<2>&, const mpl_::int_<2>&)
>> > void generic_interconvert(To& to, const From& from, const
>> > mpl::int_<number_kind_rational>& /*to_type*/, const
>> > mpl::int_<number_kind_rational>& /*from_type*/)
>> > ^
>> > ./boost/multiprecision/detail/generic_interconvert.hpp:209:6: note:
>> > template argument deduction/substitution failed:
>> > In file included from
>> > ./boost/multiprecision/detail/generic_interconvert.hpp:9:0,
>> > from ./boost/multiprecision/number.hpp:22,
>> > from ./boost/multiprecision/cpp_int.hpp:12,
>> > from mpTest.cpp:1:
>> > ./boost/multiprecision/detail/default_ops.hpp:922:134: note: cannot
>> > convert
>> >
>> ‘boost::multiprecision::number_category<boost::multiprecision::backends::cpp_int_backend<128u,
>> > 128u, (boost::multiprecision::cpp_integer_type)1u,
>> > (boost::multiprecision::cpp_int_check_type)0u, void> >()’ (type
>> >
>> ‘boost::multiprecision::number_category<boost::multiprecision::backends::cpp_int_backend<128u,
>> > 128u, (boost::multiprecision::cpp_integer_type)1u,
>> > (boost::multiprecision::cpp_int_check_type)0u, void> >’) to type
>> > ‘const mpl_::int_<2>&’
>> >
>> boost::multiprecision::detail::generic_interconvert(result->value.backend(),
>>
>> > backend, number_category<B1>(), number_category<B2>());
>> > ^
>> > In file included from ./boost/multiprecision/number.hpp:22:0,
>> > from ./boost/multiprecision/cpp_int.hpp:12,
>> > from mpTest.cpp:1:
>> > ./boost/multiprecision/detail/generic_interconvert.hpp:220:6: note:
>> > template<class To, class From> void
>> > boost::multiprecision::detail::generic_interconvert(To&, const From&,
>> > const mpl_::int_<2>&, const mpl_::int_<0>&)
>> > void generic_interconvert(To& to, const From& from, const
>> > mpl::int_<number_kind_rational>& /*to_type*/, const
>> > mpl::int_<number_kind_integer>& /*from_type*/)
>> > ^
>> > ./boost/multiprecision/detail/generic_interconvert.hpp:220:6: note:
>> > template argument deduction/substitution failed:
>> > In file included from
>> > ./boost/multiprecision/detail/generic_interconvert.hpp:9:0,
>> > from ./boost/multiprecision/number.hpp:22,
>> > from ./boost/multiprecision/cpp_int.hpp:12,
>> > from mpTest.cpp:1:
>> > ./boost/multiprecision/detail/default_ops.hpp:922:134: note: cannot
>> > convert
>> >
>> ‘boost::multiprecision::number_category<boost::multiprecision::backends::cpp_int_backend<128u,
>> > 128u, (boost::multiprecision::cpp_integer_type)1u,
>> > (boost::multiprecision::cpp_int_check_type)0u, void> >()’ (type
>> >
>> ‘boost::multiprecision::number_category<boost::multiprecision::backends::cpp_int_backend<128u,
>> > 128u, (boost::multiprecision::cpp_integer_type)1u,
>> > (boost::multiprecision::cpp_int_check_type)0u, void> >’) to type
>> > ‘const mpl_::int_<2>&’
>> >
>> boost::multiprecision::detail::generic_interconvert(result->value.backend(),
>>
>> > backend, number_category<B1>(), number_category<B2>());
>> > ^
>> >
>> > Rob
>> >
>> >
>> >
>> >
>> ------------------------------------------------------------------------
>> > *From:* Boost-users <boost-users-bounces_at_[hidden]> on behalf of
>> > John Maddock <jz.maddock_at_[hidden]>
>> > *Sent:* Thursday, August 18, 2016 12:14:06 PM
>> > *To:* boost-users_at_[hidden]
>> > *Subject:* Re: [Boost-users] [boost][multiprecision] compile error
>> > with gcc 4.8.4
>> >
>> >
>> > On 18/08/2016 15:05, Rob Conde wrote:
>> > >
>> > > Any luck? It would be great if there was a fix in boost 1.62.
>> > >
>> >
>> > Fixed in
>> >
>> https://github.com/boostorg/multiprecision/commit/339818c0180d0719852b3e648b8d76f2ba02e32d
>> >
>> > If the tests cycle OK, I'll try to get this into 1.62, but it's
>> tight now.
>> >
>> > John.
>> >
>> > >
>> > > Thanks,
>> > >
>> > > Rob
>> > >
>> > >
>> ------------------------------------------------------------------------
>> > > *From:* Boost-users <boost-users-bounces_at_[hidden]> on
>> behalf of
>> > > John Maddock <jz.maddock_at_[hidden]>
>> > > *Sent:* Tuesday, August 16, 2016 7:11:07 AM
>> > > *To:* boost-users_at_[hidden]
>> > > *Subject:* Re: [Boost-users] [boost][multiprecision] compile error
>> > > with gcc 4.8.4
>> > >
>> > >
>> > > On 16/08/2016 01:59, Rob Conde wrote:
>> > > > #include <boost/multiprecision/cpp_int.hpp>
>> > > > #include <boost/multiprecision/cpp_bin_float.hpp>
>> > > >
>> > > > typedef boost::multiprecision::int128_t int128_t;
>> > > > typedef boost::multiprecision::cpp_bin_float_quad float128_t;
>> > > >
>> > > > int main()
>> > > > {
>> > > > int128_t intVal;
>> > > > float128_t floatVal(intVal.convert_to<float128_t>());
>> > > > return 0;
>> > > > }
>> > >
>> > > That should work, as should:
>> > >
>> > > float128_t f(intVal);
>> > >
>> > > However, while both of these do work with msvc, they fail with
>> GCC, so
>> > > there is a bug (or 2) somewhere. I'll investigate later.
>> > >
>> > > John.
>> > > _______________________________________________
>> > > Boost-users mailing list
>> > > Boost-users_at_[hidden]
>> > > http://lists.boost.org/mailman/listinfo.cgi/boost-users
>> > >
>> > >
>> > > _______________________________________________
>> > > Boost-users mailing list
>> > > Boost-users_at_[hidden]
>> > > http://lists.boost.org/mailman/listinfo.cgi/boost-users
>> >
>> > _______________________________________________
>> > Boost-users mailing list
>> > Boost-users_at_[hidden]
>> > http://lists.boost.org/mailman/listinfo.cgi/boost-users
>> >
>> >
>> > _______________________________________________
>> > Boost-users mailing list
>> > Boost-users_at_[hidden]
>> > http://lists.boost.org/mailman/listinfo.cgi/boost-users
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