[gcc r14-8292] libstdc++: Fix P2255R2 dangling checks for std::tuple in C++17 [PR108822]

[Jonathan Wakely <redi@gcc.gnu.org>]

https://gcc.gnu.org/g:502a3c03e40e8920afb734c077b045f6c5efd087

commit r14-8292-g502a3c03e40e8920afb734c077b045f6c5efd087
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Fri Jan 19 12:28:30 2024 +0000

    libstdc++: Fix P2255R2 dangling checks for std::tuple in C++17 [PR108822]
    
    I accidentally used && in a fold-expression instead of || which meant
    that in C++17 the tuple(UElements&&...) constructor only failed its
    debug assertion if all tuple elements were dangling references. Some
    missing tests (noted as "TODO") meant this wasn't tested.
    
    This fixes the fold expression and adds the missing tests.
    
    libstdc++-v3/ChangeLog:
    
            PR libstdc++/108822
            * include/std/tuple (__glibcxx_no_dangling_refs) [C++17]: Fix
            wrong fold-operator.
            * testsuite/20_util/tuple/dangling_ref.cc: Check tuples with one
            element and three elements. Check allocator-extended
            constructors.

Diff:
---
 libstdc++-v3/include/std/tuple                     |   2 +-
 .../testsuite/20_util/tuple/dangling_ref.cc        | 156 ++++++++++++++-------
 2 files changed, 110 insertions(+), 48 deletions(-)

diff --git a/libstdc++-v3/include/std/tuple b/libstdc++-v3/include/std/tuple
index 7a045b3e6a1..be92f1eb973 100644
--- a/libstdc++-v3/include/std/tuple
+++ b/libstdc++-v3/include/std/tuple
@@ -1299,7 +1299,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       // Error if construction from U... would create a dangling ref.
 # if __cpp_fold_expressions
 #  define __glibcxx_dangling_refs(U) \
-  (__reference_constructs_from_temporary(_Elements, U) && ...)
+  (__reference_constructs_from_temporary(_Elements, U) || ...)
 # else
 #  define __glibcxx_dangling_refs(U) \
   __or_<__bool_constant<__reference_constructs_from_temporary(_Elements, U) \
diff --git a/libstdc++-v3/testsuite/20_util/tuple/dangling_ref.cc b/libstdc++-v3/testsuite/20_util/tuple/dangling_ref.cc
index 74fdc242349..b2dcf359438 100644
--- a/libstdc++-v3/testsuite/20_util/tuple/dangling_ref.cc
+++ b/libstdc++-v3/testsuite/20_util/tuple/dangling_ref.cc
@@ -7,6 +7,7 @@
 
 #if __cplusplus >= 202002L
 // For C++20 and later, constructors are constrained to disallow dangling.
+static_assert(!std::is_constructible_v<std::tuple<const int&>, long>);
 static_assert(!std::is_constructible_v<std::tuple<const int&, int>, long, int>);
 static_assert(!std::is_constructible_v<std::tuple<int, const int&>, int, long>);
 static_assert(!std::is_constructible_v<std::tuple<const int&, int>,
@@ -30,76 +31,137 @@ static_assert(!std::is_constructible_v<std::tuple<int, const int&>,
 void
 test_ary_ctors()
 {
-  std::tuple<const int&, int> t1(1L, 2);
-  // { dg-error "here" "" { target { c++17_down && hosted } } 33 }
-  // { dg-error "use of deleted function" "" { target c++20 } 33 }
+  std::tuple<const int&> t1(1L);
+  // { dg-error "here" "" { target { c++17_down && hosted } } 34 }
+  // { dg-error "use of deleted function" "" { target c++20 } 34 }
 
-  std::tuple<int, const int&> t2(1, 2L);
-  // { dg-error "here" "" { target { c++17_down && hosted } } 37 }
-  // { dg-error "use of deleted function" "" { target c++20 } 37 }
+  std::tuple<const int&, int> t2(1L, 2);
+  // { dg-error "here" "" { target { c++17_down && hosted } } 38 }
+  // { dg-error "use of deleted function" "" { target c++20 } 38 }
 
-  std::tuple<const int&, const int&> t3(1L, 2L);
-  // { dg-error "here" "" { target { c++17_down && hosted } } 41 }
-  // { dg-error "use of deleted function" "" { target c++20 } 41 }
+  std::tuple<int, const int&> t3(1, 2L);
+  // { dg-error "here" "" { target { c++17_down && hosted } } 42 }
+  // { dg-error "use of deleted function" "" { target c++20 } 42 }
 
-  std::tuple<const int&, const int&> t4(std::pair<long, int>{});
-  // { dg-error "here" "" { target { c++17_down && hosted } } 45 }
-  // { dg-error "use of deleted function" "" { target c++20 } 45 }
+  std::tuple<const int&, const int&> t4(1L, 2L);
+  // { dg-error "here" "" { target { c++17_down && hosted } } 46 }
+  // { dg-error "use of deleted function" "" { target c++20 } 46 }
 
-  std::pair<int, long> p;
-  std::tuple<const int&, const int&> t5(p);
+  std::tuple<const int&, const int&> t5(std::pair<long, int>{});
   // { dg-error "here" "" { target { c++17_down && hosted } } 50 }
   // { dg-error "use of deleted function" "" { target c++20 } 50 }
+
+  std::pair<int, long> p;
+  std::tuple<const int&, const int&> t6(p);
+  // { dg-error "here" "" { target { c++17_down && hosted } } 55 }
+  // { dg-error "use of deleted function" "" { target c++20 } 55 }
+
+  std::tuple<const int&, int, int> t7(1L, 2, 3);
+  // { dg-error "here" "" { target { c++17_down && hosted } } 59 }
+  // { dg-error "use of deleted function" "" { target c++20 } 59 }
 }
 
 void
 test_converting_ctors()
 {
-  std::tuple<long, long> t0;
+  std::tuple<long> t10;
+
+  std::tuple<const int&> t11(t10);
+  // { dg-error "here" "" { target { c++17_down && hosted } } 69 }
+  // { dg-error "use of deleted function" "" { target c++20 } 69 }
+
+  std::tuple<const int&> t12(std::move(t10));
+  // { dg-error "here" "" { target { c++17_down && hosted } } 73 }
+  // { dg-error "use of deleted function" "" { target c++20 } 73 }
 
-  std::tuple<const int&, int> t1(t0);
-  // { dg-error "here" "" { target { c++17_down && hosted } } 60 }
-  // { dg-error "use of deleted function" "" { target c++20 } 60 }
+  std::tuple<long, long> t20;
 
-  std::tuple<int, const int&> t2(t0);
-  // { dg-error "here" "" { target { c++17_down && hosted } } 64 }
-  // { dg-error "use of deleted function" "" { target c++20 } 64 }
+  std::tuple<const int&, int> t21(t20);
+  // { dg-error "here" "" { target { c++17_down && hosted } } 79 }
+  // { dg-error "use of deleted function" "" { target c++20 } 79 }
 
-  std::tuple<const int&, const int&> t3(t0);
-  // { dg-error "here" "" { target { c++17_down && hosted } } 68 }
-  // { dg-error "use of deleted function" "" { target c++20 } 68 }
+  std::tuple<int, const int&> t22(t20);
+  // { dg-error "here" "" { target { c++17_down && hosted } } 83 }
+  // { dg-error "use of deleted function" "" { target c++20 } 83 }
 
-  std::tuple<const int&, int> t4(std::move(t0));
-  // { dg-error "here" "" { target { c++17_down && hosted } } 72 }
-  // { dg-error "use of deleted function" "" { target c++20 } 72 }
+  std::tuple<const int&, const int&> t23(t20);
+  // { dg-error "here" "" { target { c++17_down && hosted } } 87 }
+  // { dg-error "use of deleted function" "" { target c++20 } 87 }
 
-  std::tuple<int, const int&> t5(std::move(t0));
-  // { dg-error "here" "" { target { c++17_down && hosted } } 76 }
-  // { dg-error "use of deleted function" "" { target c++20 } 76 }
+  std::tuple<const int&, int> t24(std::move(t20));
+  // { dg-error "here" "" { target { c++17_down && hosted } } 91 }
+  // { dg-error "use of deleted function" "" { target c++20 } 91 }
 
-  std::tuple<const int&, const int&> t6(std::move(t0));
-  // { dg-error "here" "" { target { c++17_down && hosted } } 80 }
-  // { dg-error "use of deleted function" "" { target c++20 } 80 }
+  std::tuple<int, const int&> t25(std::move(t20));
+  // { dg-error "here" "" { target { c++17_down && hosted } } 95 }
+  // { dg-error "use of deleted function" "" { target c++20 } 95 }
+
+  std::tuple<const int&, const int&> t26(std::move(t20));
+  // { dg-error "here" "" { target { c++17_down && hosted } } 99 }
+  // { dg-error "use of deleted function" "" { target c++20 } 99 }
 
   std::pair<long, long> p0;
-  std::tuple<const int&, int> t7(p0);
-  // { dg-error "here" "" { target { c++17_down && hosted } } 85 }
-  // { dg-error "use of deleted function" "" { target c++20 } 85 }
+  std::tuple<const int&, int> t27(p0);
+  // { dg-error "here" "" { target { c++17_down && hosted } } 104 }
+  // { dg-error "use of deleted function" "" { target c++20 } 104 }
 
-  std::tuple<int, const int&> t8(p0);
-  // { dg-error "here" "" { target { c++17_down && hosted } } 89 }
-  // { dg-error "use of deleted function" "" { target c++20 } 89 }
+  std::tuple<int, const int&> t28(p0);
+  // { dg-error "here" "" { target { c++17_down && hosted } } 108 }
+  // { dg-error "use of deleted function" "" { target c++20 } 108 }
 
-  std::tuple<const int&, int> t9(std::move(p0));
-  // { dg-error "here" "" { target { c++17_down && hosted } } 93 }
-  // { dg-error "use of deleted function" "" { target c++20 } 93 }
+  std::tuple<const int&, int> t29(std::move(p0));
+  // { dg-error "here" "" { target { c++17_down && hosted } } 112 }
+  // { dg-error "use of deleted function" "" { target c++20 } 112 }
 
-  std::tuple<int, const int&> t10(std::move(p0));
-  // { dg-error "here" "" { target { c++17_down && hosted } } 97 }
-  // { dg-error "use of deleted function" "" { target c++20 } 97 }
+  std::tuple<int, const int&> t210(std::move(p0));
+  // { dg-error "here" "" { target { c++17_down && hosted } } 116 }
+  // { dg-error "use of deleted function" "" { target c++20 } 116 }
 }
 
-// TODO: test allocator-extended ctors
-// TODO: test 1-tuple or 3-tuple, not just 2-tuple
+#include <memory>
+
+void
+test_allocator_extended_ctors()
+{
+  std::allocator<int> a;
+
+  std::tuple<const int&> t1(std::allocator_arg, a, 1L);
+  // { dg-error "here" "" { target { c++17_down && hosted } } 128 }
+  // { dg-error "use of deleted function" "" { target c++20 } 128 }
+
+  std::tuple<const int&, int> t2(std::allocator_arg, a, 1L, 2);
+  // { dg-error "here" "" { target { c++17_down && hosted } } 132 }
+  // { dg-error "use of deleted function" "" { target c++20 } 132 }
+
+  std::tuple<long> tl;
+
+  std::tuple<const int&> t3(std::allocator_arg, a, tl);
+  // { dg-error "here" "" { target { c++17_down && hosted } } 138 }
+  // { dg-error "use of deleted function" "" { target c++20 } 138 }
+
+  std::tuple<const int&> t4(std::allocator_arg, a, std::move(tl));
+  // { dg-error "here" "" { target { c++17_down && hosted } } 142 }
+  // { dg-error "use of deleted function" "" { target c++20 } 142 }
+
+  std::tuple<long, long> tll;
+
+  std::tuple<const int&, int> t5(std::allocator_arg, a, tll);
+  // { dg-error "here" "" { target { c++17_down && hosted } } 148 }
+  // { dg-error "use of deleted function" "" { target c++20 } 148 }
+
+  std::tuple<const int&, int> t6(std::allocator_arg, a, std::move(tll));
+  // { dg-error "here" "" { target { c++17_down && hosted } } 152 }
+  // { dg-error "use of deleted function" "" { target c++20 } 152 }
+
+  std::pair<long, long> pll;
+
+  std::tuple<const int&, int> t7(std::allocator_arg, a, pll);
+  // { dg-error "here" "" { target { c++17_down && hosted } } 158 }
+  // { dg-error "use of deleted function" "" { target c++20 } 158 }
+
+  std::tuple<const int&, int> t8(std::allocator_arg, a, std::move(pll));
+  // { dg-error "here" "" { target { c++17_down && hosted } } 162 }
+  // { dg-error "use of deleted function" "" { target c++20 } 162 }
+}
 
 // { dg-error "static assert.* dangling reference" "" { target { c++17_down && hosted } } 0 }