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Fix issue with temporaries when compiling constexpr expression templates with clang #757

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Merged
mborland merged 2 commits into from
Apr 16, 2026
+39 −1
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Fix issue with temporaries when compiling constexpr expression templates with clang #757

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259bdcc
Fix issue with temporaries when compiling constexpr expression templa…
marcoffee Apr 10, 2026
3645c30
Remove incomplete comment at constexpr_test_cpp_int_8.cpp
marcoffee Apr 10, 2026
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2 changes: 1 addition & 1 deletion include/boost/multiprecision/detail/number_base.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -457,7 +457,7 @@ struct expression_storage_base<T, true>
};

template <class T>
struct expression_storage : public expression_storage_base<T, boost::multiprecision::detail::is_arithmetic<T>::value>
struct expression_storage : public expression_storage_base<T, boost::multiprecision::detail::is_arithmetic<T>::value || std::is_empty<T>::value>
{};

template <class T>
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1 change: 1 addition & 0 deletions test/Jamfile.v2
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Expand Up @@ -1062,6 +1062,7 @@ test-suite misc :
[ run constexpr_test_cpp_int_5.cpp : : : [ requires cxx14_constexpr cxx17_if_constexpr ] [ check-target-builds ../config//has_is_constant_evaluated : : <build>no ] ]
[ run constexpr_test_cpp_int_6.cpp : : : [ requires cxx14_constexpr cxx17_if_constexpr ] [ check-target-builds ../config//has_is_constant_evaluated : "<toolset>msvc:<cxxflags>-constexpr:steps10000000" <toolset>clang:<cxxflags>-fconstexpr-steps=268435456 : <build>no ] [ check-target-builds ../config//has_constexpr_limits : <cxxflags>-fconstexpr-ops-limit=268435456 ] ]
[ run constexpr_test_cpp_int_7.cpp : : : [ requires cxx14_constexpr cxx17_if_constexpr ] [ check-target-builds ../config//has_is_constant_evaluated : "<toolset>msvc:<cxxflags>-constexpr:steps10000000" <toolset>clang:<cxxflags>-fconstexpr-steps=268435456 : <build>no ] ]
[ run constexpr_test_cpp_int_8.cpp : : : [ requires cxx14_constexpr cxx17_if_constexpr ] [ check-target-builds ../config//has_is_constant_evaluated : : <build>no ] ]

[ compile test_nothrow_cpp_int.cpp ]
[ compile test_nothrow_cpp_rational.cpp ]
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37 changes: 37 additions & 0 deletions test/constexpr_test_cpp_int_8.cpp
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@@ -0,0 +1,37 @@
// (C) Copyright Marco Ribeiro 2026.
// Use, modification and distribution are subject to the
// Boost Software License, Version 1.0. (See accompanying file
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

#include "constexpr_arithmetric_test.hpp"
#include "boost/multiprecision/cpp_int.hpp"
#include "test.hpp"

#if !defined(BOOST_MP_NO_CONSTEXPR_DETECTION) && !defined(DISABLE_TESTS)

int main()
{
namespace mp = boost::multiprecision;

using int512_et_off = mp::number<mp::cpp_int_backend<
512, 512, mp::signed_magnitude, mp::unchecked, void
>, mp::et_off>;

using int512_et_on = mp::number<mp::cpp_int_backend<
512, 512, mp::signed_magnitude, mp::unchecked, void
>, mp::et_on>;

static_assert(mp::abs(int512_et_off(-12345)) == 12345);
static_assert(mp::conj(int512_et_off(100)) == 100);
static_assert(mp::proj(int512_et_off(100)) == 100);
static_assert(mp::powm(int512_et_off(-5), 2, 7) == 4);

static_assert(mp::abs(int512_et_on(-12345)) == 12345);
static_assert(mp::conj(int512_et_on(100)) == 100);
static_assert(mp::proj(int512_et_on(100)) == 100);
static_assert(mp::powm(int512_et_on(-5), 2, 7) == 4);
}
#else
int main() {}
#endif

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