[gcc(refs/users/ppalka/heads/integer_class_type)] Implement integer-like class types as defined in [iterator.concept.winc]
Patrick Palka
ppalka@gcc.gnu.org
Fri Jan 17 06:07:00 GMT 2020
https://gcc.gnu.org/g:f09ede1b9efce84a4c649c58ec44125800177053
commit f09ede1b9efce84a4c649c58ec44125800177053
Author: Patrick Palka <ppalka@gcc.gnu.org>
Date: Wed Jan 15 14:37:45 2020 +0000
Implement integer-like class types as defined in [iterator.concept.winc]
Diff:
---
libstdc++-v3/include/bits/iterator_concepts.h | 15 +-
libstdc++-v3/include/bits/range_access.h | 516 +++++++++++++++++++++
.../testsuite/std/ranges/iota/difference_type.cc | 221 +++++++++
3 files changed, 745 insertions(+), 7 deletions(-)
diff --git a/libstdc++-v3/include/bits/iterator_concepts.h b/libstdc++-v3/include/bits/iterator_concepts.h
index bf58159..32cf02c 100644
--- a/libstdc++-v3/include/bits/iterator_concepts.h
+++ b/libstdc++-v3/include/bits/iterator_concepts.h
@@ -494,20 +494,21 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
namespace ranges::__detail
{
-#if __SIZEOF_INT128__
- using __max_diff_type = __int128;
- using __max_size_type = unsigned __int128;
-#else
- using __max_diff_type = long long;
- using __max_size_type = unsigned long long;
-#endif
+ class __max_diff_type;
+ class __max_size_type;
template<typename _Tp>
concept __is_integer_like = integral<_Tp>
+#if __SIZEOF_INT128__
+ || same_as<_Tp, __int128> || same_as<_Tp, unsigned __int128>
+#endif
|| same_as<_Tp, __max_diff_type> || same_as<_Tp, __max_size_type>;
template<typename _Tp>
concept __is_signed_integer_like = signed_integral<_Tp>
+#if __SIZEOF_INT128__
+ || same_as<_Tp, __int128>
+#endif
|| same_as<_Tp, __max_diff_type>;
} // namespace ranges::__detail
diff --git a/libstdc++-v3/include/bits/range_access.h b/libstdc++-v3/include/bits/range_access.h
index 8b546a5..697712b2 100644
--- a/libstdc++-v3/include/bits/range_access.h
+++ b/libstdc++-v3/include/bits/range_access.h
@@ -347,6 +347,522 @@ namespace ranges
namespace __detail
{
+ class __max_size_type
+ {
+ public:
+ __max_size_type() = default;
+
+ template<integral _Tp>
+ constexpr
+ __max_size_type(_Tp __i) noexcept
+ : _M_val(__i), _M_msb(__i < 0)
+ { }
+
+ template<int __dummy = 0>
+ constexpr explicit
+ __max_size_type(const __max_diff_type& __d) noexcept
+ : __max_size_type(__d._M_rep)
+ { }
+
+ template<integral _Tp>
+ constexpr explicit operator _Tp() const noexcept
+ { return _M_val; }
+
+ constexpr explicit
+ operator bool() const noexcept { return _M_val != 0 || _M_msb != 0; }
+
+ constexpr __max_size_type
+ operator+() const noexcept { return *this; }
+
+ constexpr __max_size_type
+ operator~() const noexcept
+ { return __max_size_type{~_M_val, !_M_msb}; }
+
+ constexpr __max_size_type
+ operator-() const noexcept
+ { return operator~() + 1; }
+
+ constexpr __max_size_type&
+ operator+=(const __max_size_type& __r) noexcept
+ {
+ const auto __sum = _M_val + __r._M_val;
+ const bool __overflow = (__sum < _M_val);
+ _M_msb = _M_msb ^ __r._M_msb ^ __overflow;
+ _M_val = __sum;
+ return *this;
+ }
+
+ constexpr __max_size_type&
+ operator-=(const __max_size_type& __r) noexcept
+ { return *this += -__r; }
+
+ constexpr __max_size_type&
+ operator*=(const __max_size_type& __r) noexcept
+ {
+ const bool __lsb = _M_val % 2;
+ *this >>= 1;
+
+ auto __rcopy = __r;
+ const bool __rlsb = __rcopy._M_val % 2;
+ __rcopy >>= 1;
+
+ auto __res = 2 * _M_val * __rcopy._M_val;
+ __res += _M_val * __rlsb;
+ __res += __rcopy._M_val * __lsb;
+ _M_val = __res;
+ *this <<= 1;
+ *this += __rlsb * __lsb;
+
+ return *this;
+ }
+
+ constexpr __max_size_type&
+ operator/=(const __max_size_type& __r) noexcept
+ {
+ __glibcxx_assert(__r != 0);
+
+ if (_M_msb && __r._M_msb)
+ {
+ _M_val = (_M_val >= __r._M_val);
+ _M_msb = 0;
+ }
+ else if (!_M_msb && __r._M_msb)
+ _M_val = 0;
+ else if (!_M_msb && !__r._M_msb)
+ _M_val /= __r._M_val;
+ else if (_M_msb && !__r._M_msb)
+ {
+ const auto __orig = *this;
+ *this >>= 1;
+ _M_val /= __r._M_val;
+ *this <<= 1;
+ if (__orig - *this * __r >= __r)
+ _M_val++;
+ }
+ return *this;
+ }
+
+ constexpr __max_size_type&
+ operator%=(const __max_size_type& __r) noexcept
+ {
+ *this = *this - (*this / __r) * __r;
+ return *this;
+ }
+
+ constexpr __max_size_type&
+ operator<<=(const __max_size_type& __r) noexcept
+ {
+ constexpr auto __bits = sizeof(__rep) * __CHAR_BIT__;
+ __glibcxx_assert(__r._M_val < __bits);
+ __glibcxx_assert(__r._M_msb == 0);
+ if (_M_val & (__rep(1) << __bits - __r._M_val))
+ _M_msb = 1;
+ else
+ _M_msb = 0;
+ _M_val <<= __r._M_val;
+ return *this;
+ }
+
+ constexpr __max_size_type&
+ operator>>=(const __max_size_type& __r) noexcept
+ {
+ constexpr auto __bits = sizeof(__rep) * __CHAR_BIT__;
+ __glibcxx_assert(__r._M_val < __bits);
+ __glibcxx_assert(__r._M_msb == 0);
+
+ _M_val >>= __r._M_val;
+ if (_M_msb && __r._M_val != 0)
+ {
+ _M_val |= __rep(1) << (__bits - __r._M_val);
+ _M_msb = 0;
+ }
+
+ return *this;
+ }
+
+ constexpr __max_size_type&
+ operator&=(const __max_size_type& __r) noexcept
+ {
+ _M_val &= __r._M_val;
+ _M_msb &= __r._M_msb;
+ return *this;
+ }
+
+ constexpr __max_size_type&
+ operator|=(const __max_size_type& __r) noexcept
+ {
+ _M_val |= __r._M_val;
+ _M_msb |= __r._M_msb;
+ return *this;
+ }
+
+ constexpr __max_size_type&
+ operator^=(const __max_size_type& __r) noexcept
+ {
+ _M_val ^= __r._M_val;
+ _M_msb ^= __r._M_msb;
+ return *this;
+ }
+
+ friend constexpr __max_size_type
+ operator+(__max_size_type __l, const __max_size_type& __r) noexcept
+ {
+ __l += __r;
+ return __l;
+ }
+
+ friend constexpr __max_size_type
+ operator-(__max_size_type __l, const __max_size_type& __r) noexcept
+ {
+ __l -= __r;
+ return __l;
+ }
+
+ friend constexpr __max_size_type
+ operator*(__max_size_type __l, const __max_size_type& __r) noexcept
+ {
+ __l *= __r;
+ return __l;
+ }
+
+ friend constexpr __max_size_type
+ operator/(__max_size_type __l, const __max_size_type& __r) noexcept
+ {
+ __l /= __r;
+ return __l;
+ }
+
+ friend constexpr __max_size_type
+ operator%(__max_size_type __l, const __max_size_type& __r) noexcept
+ {
+ __l %= __r;
+ return __l;
+ }
+
+ friend constexpr __max_size_type
+ operator<<(__max_size_type __l, const __max_size_type& __r) noexcept
+ {
+ __l <<= __r;
+ return __l;
+ }
+
+ friend constexpr __max_size_type
+ operator>>(__max_size_type __l, const __max_size_type& __r) noexcept
+ {
+ __l >>= __r;
+ return __l;
+ }
+
+ friend constexpr __max_size_type
+ operator&(__max_size_type __l, const __max_size_type& __r) noexcept
+ {
+ __l &= __r;
+ return __l;
+ }
+
+ friend constexpr __max_size_type
+ operator|(__max_size_type __l, const __max_size_type& __r) noexcept
+ {
+ __l |= __r;
+ return __l;
+ }
+
+ friend constexpr __max_size_type
+ operator^(__max_size_type __l, const __max_size_type& __r) noexcept
+ {
+ __l ^= __r;
+ return __l;
+ }
+
+ friend constexpr bool
+ operator==(const __max_size_type& __l, const __max_size_type& __r)
+ noexcept
+ { return __l._M_val == __r._M_val && __l._M_msb == __r._M_msb; }
+
+ friend constexpr bool
+ operator!=(const __max_size_type& __l, const __max_size_type& __r)
+ noexcept
+ { return !(__l == __r); }
+
+ friend constexpr bool
+ operator<(const __max_size_type& __l, const __max_size_type& __r) noexcept
+ {
+ if (__l._M_msb == __r._M_msb)
+ return __l._M_val < __r._M_val;
+ else
+ return __r._M_msb;
+ }
+
+ friend constexpr bool
+ operator>(const __max_size_type& __l, const __max_size_type& __r) noexcept
+ { return __r < __l; }
+
+ friend constexpr bool
+ operator<=(const __max_size_type& __l, const __max_size_type& __r) noexcept
+ { return !(__l > __r); }
+
+ friend constexpr bool
+ operator>=(const __max_size_type& __l, const __max_size_type& __r) noexcept
+ { return __r <= __l; }
+
+#ifdef __SIZEOF_INT128__
+ using __rep = unsigned __int128;
+#else
+ using __rep = unsigned long long;
+#endif
+ private:
+ __rep _M_val = 0;
+ unsigned _M_msb : 1 = 0;
+
+ constexpr explicit
+ __max_size_type(__rep __val, int __msb) noexcept
+ : _M_val(__val), _M_msb(__msb)
+ { }
+
+ friend class __max_diff_type;
+ };
+
+ class __max_diff_type
+ {
+ public:
+ __max_diff_type() = default;
+
+ template<integral _Tp>
+ constexpr
+ __max_diff_type(_Tp __i) noexcept
+ : _M_rep(__i)
+ { }
+
+ constexpr explicit
+ __max_diff_type(const __max_size_type& __d) noexcept
+ : _M_rep(__d)
+ { }
+
+ template<integral _Tp>
+ constexpr explicit operator _Tp() const noexcept
+ { return static_cast<_Tp>(_M_rep); }
+
+ constexpr explicit
+ operator bool() const noexcept { return _M_rep != 0; }
+
+ constexpr __max_diff_type
+ operator+() const noexcept { return *this; }
+
+ constexpr __max_diff_type
+ operator-() const noexcept
+ { return __max_diff_type(-_M_rep); }
+
+ constexpr __max_diff_type
+ operator~() const noexcept
+ { return __max_diff_type(~_M_rep); }
+
+ constexpr __max_diff_type&
+ operator+=(const __max_diff_type& __r) noexcept
+ {
+ _M_rep += __r._M_rep;
+ return *this;
+ }
+
+ constexpr __max_diff_type&
+ operator-=(const __max_diff_type& __r) noexcept
+ {
+ _M_rep -= __r._M_rep;
+ return *this;
+ }
+
+ constexpr __max_diff_type&
+ operator*=(const __max_diff_type& __r) noexcept
+ {
+ _M_rep *= __r._M_rep;
+ return *this;
+ }
+
+ constexpr __max_diff_type&
+ operator/=(const __max_diff_type& __r) noexcept
+ {
+ const auto __neg = *this < 0;
+ const auto __rneg = __r < 0;
+ if (!__neg && !__rneg)
+ _M_rep = _M_rep / __r._M_rep;
+ else if (__neg && __rneg)
+ _M_rep = -_M_rep / -__r._M_rep;
+ else
+ {
+ auto __rcopy = __r;
+ if (__neg)
+ _M_rep = -_M_rep;
+ if (__rneg)
+ __rcopy = -__rcopy;
+ _M_rep = -(_M_rep / __rcopy._M_rep);
+ }
+ return *this;
+ }
+
+ constexpr __max_diff_type&
+ operator%=(const __max_diff_type& __r) noexcept
+ {
+ *this = *this - (*this / __r) * __r;
+ return *this;
+ }
+
+ constexpr __max_diff_type&
+ operator<<=(const __max_diff_type& __r) noexcept
+ {
+ _M_rep.operator<<=(__r._M_rep);
+ return *this;
+ }
+
+ constexpr __max_diff_type&
+ operator>>=(const __max_diff_type& __r) noexcept
+ {
+ const auto __msb = _M_rep._M_msb;
+ _M_rep >>= __r._M_rep;
+ _M_rep._M_msb |= __msb;
+ return *this;
+ }
+
+ constexpr __max_diff_type&
+ operator&=(const __max_diff_type& __r) noexcept
+ {
+ _M_rep &= __r._M_rep;
+ return *this;
+ }
+
+ constexpr __max_diff_type&
+ operator|=(const __max_diff_type& __r) noexcept
+ {
+ _M_rep |= __r._M_rep;
+ return *this;
+ }
+
+ constexpr __max_diff_type&
+ operator^=(const __max_diff_type& __r) noexcept
+ {
+ _M_rep ^= __r._M_rep;
+ return *this;
+ }
+
+ friend constexpr __max_diff_type
+ operator+(__max_diff_type __l, const __max_diff_type& __r) noexcept
+ {
+ __l += __r;
+ return __l;
+ }
+
+ friend constexpr __max_diff_type
+ operator-(__max_diff_type __l, const __max_diff_type& __r) noexcept
+ {
+ __l -= __r;
+ return __l;
+ }
+
+ friend constexpr __max_diff_type
+ operator*(__max_diff_type __l, const __max_diff_type& __r) noexcept
+ {
+ __l *= __r;
+ return __l;
+ }
+
+ friend constexpr __max_diff_type
+ operator/(__max_diff_type __l, const __max_diff_type& __r) noexcept
+ {
+ __l /= __r;
+ return __l;
+ }
+
+ friend constexpr __max_diff_type
+ operator%(__max_diff_type __l, const __max_diff_type& __r) noexcept
+ {
+ __l %= __r;
+ return __l;
+ }
+
+ friend constexpr __max_diff_type
+ operator<<(__max_diff_type __l, const __max_diff_type& __r) noexcept
+ {
+ __l <<= __r;
+ return __l;
+ }
+
+ friend constexpr __max_diff_type
+ operator>>(__max_diff_type __l, const __max_diff_type& __r) noexcept
+ {
+ __l >>= __r;
+ return __l;
+ }
+
+ friend constexpr __max_diff_type
+ operator&(__max_diff_type __l, const __max_diff_type& __r) noexcept
+ {
+ __l &= __r;
+ return __l;
+ }
+
+ friend constexpr __max_diff_type
+ operator|(__max_diff_type __l, const __max_diff_type& __r) noexcept
+ {
+ __l |= __r;
+ return __l;
+ }
+
+ friend constexpr __max_diff_type
+ operator^(__max_diff_type __l, const __max_diff_type& __r) noexcept
+ {
+ __l ^= __r;
+ return __l;
+ }
+
+ friend constexpr bool
+ operator==(const __max_diff_type& __l, const __max_diff_type& __r)
+ noexcept
+ {
+ return __l._M_rep == __r._M_rep;
+ }
+
+ friend constexpr bool
+ operator!=(const __max_diff_type& __l, const __max_diff_type& __r)
+ noexcept
+ { return !(__l == __r); }
+
+ constexpr bool
+ operator<(const __max_diff_type& __r) const noexcept
+ {
+ const auto __lsign = _M_rep._M_msb;
+ const auto __rsign = __r._M_rep._M_msb;
+ if (__lsign ^ __rsign)
+ return __lsign;
+ else
+ return _M_rep < __r._M_rep;
+ }
+
+ friend constexpr bool
+ operator>(const __max_diff_type& __l, const __max_diff_type& __r) noexcept
+ { return __r < __l; }
+
+ friend constexpr bool
+ operator<=(const __max_diff_type& __l, const __max_diff_type& __r) noexcept
+ { return !(__r < __l); }
+
+ friend constexpr bool
+ operator>=(const __max_diff_type& __l, const __max_diff_type& __r) noexcept
+ { return !(__l < __r); }
+
+ private:
+ __max_size_type _M_rep = 0;
+
+ friend class __max_size_type;
+ };
+
+ static_assert(sizeof(__max_diff_type) == sizeof(__max_size_type));
+
+ constexpr __max_size_type
+ __to_unsigned_like(__max_size_type __t) noexcept
+ { return __t; }
+
+ constexpr __max_size_type
+ __to_unsigned_like(__max_diff_type __t) noexcept
+ { return __max_size_type(__t); }
+
template<integral _Tp>
constexpr make_unsigned_t<_Tp>
__to_unsigned_like(_Tp __t) noexcept
diff --git a/libstdc++-v3/testsuite/std/ranges/iota/difference_type.cc b/libstdc++-v3/testsuite/std/ranges/iota/difference_type.cc
new file mode 100644
index 0000000..a3b3029
--- /dev/null
+++ b/libstdc++-v3/testsuite/std/ranges/iota/difference_type.cc
@@ -0,0 +1,221 @@
+// Copyright (C) 2020 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// <http://www.gnu.org/licenses/>.
+
+// { dg-options "-std=gnu++2a" }
+// { dg-do run { target c++2a } }
+
+#include <ranges>
+#include <testsuite_hooks.h>
+
+void
+test01()
+{
+ using I = unsigned long long;
+ auto imax = std::numeric_limits<I>::max();
+ std::ranges::iota_view<I, I> i(0, imax);
+ auto begin = i.begin();
+ static_assert( std::input_or_output_iterator<decltype(begin)> );
+ auto size = std::ranges::end(i) - std::ranges::begin(i);
+ VERIFY( size > 0 );
+ VERIFY( size == imax );
+}
+
+void
+test02()
+{
+#if __SIZEOF_INT128__
+ using I = unsigned __int128;
+ auto imax = std::numeric_limits<I>::max();
+ std::ranges::iota_view<I, I> i(0, imax);
+ auto begin = i.begin();
+ static_assert( std::input_or_output_iterator<decltype(begin)> );
+ auto size = std::ranges::end(i) - std::ranges::begin(i);
+ VERIFY( size > 0 );
+ VERIFY( size == imax );
+#endif
+}
+
+using max_size_t = std::ranges::__detail::__max_size_type;
+using max_diff_t = std::ranges::__detail::__max_diff_type;
+using rep_t = max_size_t::__rep;
+
+void
+test03()
+{
+ static_assert(max_size_t(7) % 3 == 1);
+ static_assert(max_size_t(7) % 4 == 3);
+
+ static_assert(-max_diff_t(1) == max_diff_t(-1));
+ static_assert(max_diff_t(3) % 2 == 1);
+ static_assert(max_diff_t(-3) / 2 == -1);
+ static_assert(max_diff_t(-3) % 2 == -1);
+ static_assert(max_diff_t(3) % -2 == 1);
+ static_assert(max_diff_t(-3) << 1 == -6);
+ static_assert(max_diff_t(-3) >> 1 == -2);
+ static_assert(max_diff_t(3) >> 1 == 1);
+ static_assert(max_diff_t(3) >> 2 == 0);
+
+ static_assert(max_diff_t(-5) / 3 == -1);
+ static_assert(max_diff_t(5) / -3 == -1);
+ static_assert(max_diff_t(-5) / -3 == 1);
+ static_assert(max_diff_t(5) / 3 == 1);
+
+ static_assert(max_diff_t(-6) / 3 == -2);
+ static_assert(max_diff_t(6) / -3 == -2);
+ static_assert(max_diff_t(-6) / -3 == 2);
+ static_assert(max_diff_t(6) / 3 == 2);
+
+ static_assert(~max_size_t(-3) == 2);
+ static_assert(~max_diff_t(-3) == 2);
+
+ static_assert(max_diff_t(1) < max_diff_t(3));
+ static_assert(max_diff_t(-1) < max_diff_t(3));
+ static_assert(max_diff_t(1) > max_diff_t(-3));
+ static_assert(max_diff_t(-1) > max_diff_t(-3));
+
+ constexpr max_size_t mu = std::numeric_limits<rep_t>::max();
+
+ static_assert(max_diff_t(mu)/-1 == -max_diff_t(mu));
+ static_assert(-max_diff_t(mu)/1 == -max_diff_t(mu));
+ static_assert(max_diff_t(mu)>>1 == max_diff_t(mu)/2);
+ static_assert(-max_diff_t(mu+1) == max_diff_t(mu+1));
+ static_assert(-(mu+1) == mu+1);
+ static_assert((mu+1)<<1 == 0);
+ static_assert(max_diff_t(mu+1)<<1 == 0);
+ static_assert(max_diff_t(mu+1)>>1 < 0);
+
+ static_assert(int(max_diff_t(mu+1)) == 0);
+ static_assert(rep_t(max_diff_t(mu+1)) == 0);
+ static_assert(int(max_diff_t(mu)) == -1);
+ static_assert(rep_t(max_diff_t(mu)) == rep_t(-1));
+
+ static_assert(2*mu+1 > 2*mu);
+ static_assert(~(2*mu+1) == 0);
+ static_assert(mu/mu == 1);
+ static_assert(2*mu > mu);
+ static_assert(2*mu-mu == mu);
+ static_assert((2*mu)/mu == 2);
+ static_assert((2*mu+1)/mu == 2);
+ static_assert((2*mu-1)/(mu-1) == 2);
+ static_assert((2*mu-1)/mu == 1);
+ static_assert((2*mu+-1)/mu == 1);
+ static_assert(2*mu-1 < 2*mu);
+ static_assert(2*mu-1 <= 2*mu);
+ static_assert(2*mu+1 > 2*mu);
+ static_assert(2*mu+1 >= 2*mu);
+ static_assert((2*mu)/1 == 2*mu);
+ static_assert(mu/mu-1 == 0);
+ static_assert(mu*0 == 0);
+ static_assert((2*mu-1)*0 == 0);
+ static_assert((2*mu-1)>>1 == mu-1);
+ static_assert(mu+-1+1 == mu);
+ static_assert(mu+1+-1 == mu);
+ static_assert(mu+1);
+ static_assert((2*mu)/2 == mu);
+ static_assert((2*mu)>>1 == mu);
+ static_assert((mu<<1)>>1 == mu);
+ static_assert(1/mu == 0);
+ static_assert(mu/1 == mu);
+ static_assert(((mu+1)|mu) == -1);
+ static_assert((mu+1)+(mu+1) < mu+1);
+
+ constexpr max_size_t ou = 1;
+ constexpr max_diff_t ns = -1;
+
+ static_assert(max_size_t(ns) == -1);
+ static_assert(-max_diff_t(ou) == -1);
+ static_assert(-max_diff_t(-ou) == 1);
+ static_assert(max_size_t(-max_diff_t(-ou)) == 1);
+ static_assert(ns*ns == max_diff_t(ou));
+ static_assert(max_size_t(ns)*max_size_t(ns) == ou);
+ static_assert(-max_diff_t(0) == max_diff_t(0));
+ static_assert(-ou-ou == -2*ou);
+
+ static_assert(int(ns) == -1);
+ static_assert(rep_t(ns) == rep_t(-1));
+
+ static_assert(max_size_t() == 0);
+ static_assert(max_diff_t() == 0);
+
+ auto f = [] (auto a) { a /= a; return a; };
+ static_assert(f(max_size_t(5)) == 1);
+ static_assert(f(max_size_t(-5)) == 1);
+ static_assert(f(max_diff_t(5)) == 1);
+
+ auto g = [] (auto a) { a >>= a; return a; };
+ static_assert(g(max_size_t(5)) == 0);
+ static_assert(g(max_diff_t(5)) == 0);
+
+ auto h = [] (auto a) { a <<= a; return a; };
+ static_assert(h(max_size_t(3)) == 24);
+ static_assert(h(max_diff_t(3)) == 24);
+}
+
+template<bool signed_p, bool shorten_p>
+void
+test04()
+{
+ using hw_type = std::conditional_t<signed_p, long, unsigned long>;
+ using max_type = std::conditional_t<signed_p, max_diff_t, max_size_t>;
+ using shorten_type = std::conditional_t<shorten_p, hw_type, max_type>;
+ const int min = (signed_p ? -1000 : 0);
+ const int max = 1000;
+ for (hw_type i = min; i <= max; i++)
+ {
+ bool ok = true;
+ if (!signed_p && !shorten_p)
+ ;
+ else
+ {
+ ok &= (~i == shorten_type(~max_type(i)));
+ ok &= (-i == shorten_type(-max_type(i)));
+ }
+ for (hw_type j = min; j <= max; j++)
+ {
+ ok &= (i*j == shorten_type(max_type(i)*j));
+ ok &= (i+j == shorten_type(max_type(i)+j));
+ if (j != 0)
+ ok &= (i/j == shorten_type(max_type(i)/j));
+ if (!signed_p && !shorten_p)
+ ;
+ else
+ ok &= (i-j == shorten_type(max_type(i)-j));
+ ok &= ((i&j) == shorten_type(max_type(i)&j));
+ ok &= ((i|j) == shorten_type(max_type(i)|j));
+ ok &= ((i^j) == shorten_type(max_type(i)^j));
+ if (!ok)
+ {
+ fprintf(stderr,
+ "Inconsistency found: %d %d %ld %ld\n",
+ signed_p, shorten_p, i, j) ;
+ VERIFY(0);
+ }
+ }
+ }
+}
+
+int
+main()
+{
+ test01();
+ test02();
+ test03();
+ test04<false,false>();
+ test04<false,true>();
+ test04<true,false>();
+ test04<true,true>();
+}
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