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* [gcc r11-7670] libstdc++: Implement missing operator overloads in max_size_type.h
@ 2021-03-15 14:34 Patrick Palka
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From: Patrick Palka @ 2021-03-15 14:34 UTC (permalink / raw)
To: gcc-cvs, libstdc++-cvs
https://gcc.gnu.org/g:dce586ff83e5bf86956cb24e646c7b9a21283ce4
commit r11-7670-gdce586ff83e5bf86956cb24e646c7b9a21283ce4
Author: Patrick Palka <ppalka@redhat.com>
Date: Mon Mar 15 10:31:45 2021 -0400
libstdc++: Implement missing operator overloads in max_size_type.h
This implements operator++, operator-- and operator<=> for the
integer-class types defined in max_size_type.h, which I overlooked
when originally implementing the class.
libstdc++-v3/ChangeLog:
* include/bits/max_size_type.h (__max_size_type::operator _Tp):
Fix formatting.
(__max_size_type::operator++): Define.
(__max_size_type::operator--): Likewise.
(__max_size_type::operator<=>): Conditionally define (in place
of the other comparison operators).
(__max_diff_type::operator _Tp): Fix formatting.
(__max_diff_type::operator++): Define.
(__max_diff_type::operator--): Likewise.
(__max_diff_type::operator<=>): Conditionally define (in place
of the other comparison operators).
* testsuite/std/ranges/iota/max_size_type.cc (test01): Test
these operator overloads.
Diff:
---
libstdc++-v3/include/bits/max_size_type.h | 78 +++++++++++++++++++++-
.../testsuite/std/ranges/iota/max_size_type.cc | 36 ++++++++++
2 files changed, 112 insertions(+), 2 deletions(-)
diff --git a/libstdc++-v3/include/bits/max_size_type.h b/libstdc++-v3/include/bits/max_size_type.h
index 05984a30f1d..27d63797c49 100644
--- a/libstdc++-v3/include/bits/max_size_type.h
+++ b/libstdc++-v3/include/bits/max_size_type.h
@@ -71,7 +71,8 @@ namespace ranges
__max_size_type(const __max_diff_type& __d) noexcept;
template<typename _Tp> requires integral<_Tp> || __is_int128<_Tp>
- constexpr explicit operator _Tp() const noexcept
+ constexpr explicit
+ operator _Tp() const noexcept
{ return _M_val; }
constexpr explicit
@@ -90,6 +91,30 @@ namespace ranges
operator-() const noexcept
{ return operator~() + 1; }
+ constexpr __max_size_type&
+ operator++() noexcept
+ { return *this += 1; }
+
+ constexpr __max_size_type
+ operator++(int) noexcept
+ {
+ auto __tmp = *this;
+ ++*this;
+ return __tmp;
+ }
+
+ constexpr __max_size_type&
+ operator--() noexcept
+ { return *this -= 1; }
+
+ constexpr __max_size_type
+ operator--(int) noexcept
+ {
+ auto __tmp = *this;
+ --*this;
+ return __tmp;
+ }
+
constexpr __max_size_type&
operator+=(const __max_size_type& __r) noexcept
{
@@ -355,6 +380,16 @@ namespace ranges
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; }
+#if __cpp_lib_three_way_comparison
+ friend constexpr strong_ordering
+ operator<=>(const __max_size_type& __l, const __max_size_type& __r) noexcept
+ {
+ if (__l._M_msb ^ __r._M_msb)
+ return __l._M_msb ? strong_ordering::greater : strong_ordering::less;
+ else
+ return __l._M_val <=> __r._M_val;
+ }
+#else
friend constexpr bool
operator!=(const __max_size_type& __l, const __max_size_type& __r) noexcept
{ return !(__l == __r); }
@@ -379,6 +414,7 @@ namespace ranges
friend constexpr bool
operator>=(const __max_size_type& __l, const __max_size_type& __r) noexcept
{ return __r <= __l; }
+#endif
#if __SIZEOF_INT128__
using __rep = unsigned __int128;
@@ -417,7 +453,8 @@ namespace ranges
{ }
template<typename _Tp> requires integral<_Tp> || __is_int128<_Tp>
- constexpr explicit operator _Tp() const noexcept
+ constexpr explicit
+ operator _Tp() const noexcept
{ return static_cast<_Tp>(_M_rep); }
constexpr explicit
@@ -436,6 +473,30 @@ namespace ranges
operator~() const noexcept
{ return __max_diff_type(~_M_rep); }
+ constexpr __max_diff_type&
+ operator++() noexcept
+ { return *this += 1; }
+
+ constexpr __max_diff_type
+ operator++(int) noexcept
+ {
+ auto __tmp = *this;
+ ++*this;
+ return __tmp;
+ }
+
+ constexpr __max_diff_type&
+ operator--() noexcept
+ { return *this -= 1; }
+
+ constexpr __max_diff_type
+ operator--(int) noexcept
+ {
+ auto __tmp = *this;
+ --*this;
+ return __tmp;
+ }
+
constexpr __max_diff_type&
operator+=(const __max_diff_type& __r) noexcept
{
@@ -647,6 +708,18 @@ namespace ranges
operator==(const __max_diff_type& __l, const __max_diff_type& __r) noexcept
{ return __l._M_rep == __r._M_rep; }
+#if __cpp_lib_three_way_comparison
+ constexpr strong_ordering
+ 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 ? strong_ordering::less : strong_ordering::greater;
+ else
+ return _M_rep <=> __r._M_rep;
+ }
+#else
friend constexpr bool
operator!=(const __max_diff_type& __l, const __max_diff_type& __r) noexcept
{ return !(__l == __r); }
@@ -673,6 +746,7 @@ namespace ranges
friend constexpr bool
operator>=(const __max_diff_type& __l, const __max_diff_type& __r) noexcept
{ return !(__l < __r); }
+#endif
private:
__max_size_type _M_rep = 0;
diff --git a/libstdc++-v3/testsuite/std/ranges/iota/max_size_type.cc b/libstdc++-v3/testsuite/std/ranges/iota/max_size_type.cc
index 9284d71dbeb..983bdfbdaa6 100644
--- a/libstdc++-v3/testsuite/std/ranges/iota/max_size_type.cc
+++ b/libstdc++-v3/testsuite/std/ranges/iota/max_size_type.cc
@@ -145,6 +145,42 @@ test01()
auto h = [] (auto a) { a <<= a; return a; };
static_assert(h(max_size_t(3)) == 24);
static_assert(h(max_diff_t(3)) == 24);
+
+ auto w = [] (auto a) {
+ const auto b = a;
+ VERIFY( a++ == b && a == b+1 );
+ VERIFY( a-- == b+1 && a == b );
+
+ VERIFY( ++(++a) == b+2 );
+ VERIFY( --(--a) == b );
+ return true;
+ };
+ static_assert(w(max_size_t(10)));
+ static_assert(w(-max_diff_t(10)));
+
+#if __cpp_lib_three_way_comparison
+ static_assert(max_size_t{1} <=> max_size_t{9} == std::strong_ordering::less);
+ static_assert(max_size_t{3} <=> max_size_t{2} == std::strong_ordering::greater);
+ static_assert(max_size_t{5} <=> max_size_t{5} == std::strong_ordering::equal);
+ static_assert(~max_size_t{1} <=> ~max_size_t{9} == std::strong_ordering::greater);
+ static_assert(~max_size_t{3} <=> ~max_size_t{2} == std::strong_ordering::less);
+ static_assert(~max_size_t{5} <=> ~max_size_t{5} == std::strong_ordering::equal);
+ static_assert(~max_size_t{5} <=> max_size_t{9} == std::strong_ordering::greater);
+ static_assert(~max_size_t{9} <=> max_size_t{5} == std::strong_ordering::greater);
+ static_assert(max_size_t{5} <=> ~max_size_t{9} == std::strong_ordering::less);
+ static_assert(max_size_t{9} <=> ~max_size_t{5} == std::strong_ordering::less);
+
+ static_assert(max_diff_t{1} <=> max_diff_t{9} == std::strong_ordering::less);
+ static_assert(max_diff_t{3} <=> max_diff_t{2} == std::strong_ordering::greater);
+ static_assert(max_diff_t{5} <=> max_diff_t{5} == std::strong_ordering::equal);
+ static_assert(max_diff_t{-1} <=> max_diff_t{-9} == std::strong_ordering::greater);
+ static_assert(max_diff_t{-3} <=> max_diff_t{-2} == std::strong_ordering::less);
+ static_assert(max_diff_t{-5} <=> max_diff_t{-5} == std::strong_ordering::equal);
+ static_assert(max_diff_t{-5} <=> max_diff_t{9} == std::strong_ordering::less);
+ static_assert(max_diff_t{-9} <=> max_diff_t{5} == std::strong_ordering::less);
+ static_assert(max_diff_t{5} <=> max_diff_t{-9} == std::strong_ordering::greater);
+ static_assert(max_diff_t{9} <=> max_diff_t{-5} == std::strong_ordering::greater);
+#endif
}
template<bool signed_p, bool shorten_p>
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