From: Patrick Palka <ppalka@redhat.com>
To: gcc-patches@gcc.gnu.org
Cc: libstdc++@gcc.gnu.org, jwakely@redhat.com,
Patrick Palka <ppalka@redhat.com>
Subject: [PATCH] libstdc++: Add a test that takes the split_view of a non-forward range
Date: Wed, 11 Mar 2020 11:46:54 -0400 [thread overview]
Message-ID: <20200311154654.837650-1-ppalka@redhat.com> (raw)
This adds a tests that verifies taking the split_view of a non-forward range
works correctly. Doing so revealed a typo in one of _OuterIter's constructors.
It also revealed that the default constructor of
__gnu_test::test_range::iterator misbehaves, because by delegating to
Iter<T>(nullptr, nullptr) we perform a null-pointer deref at runtime in
input_iterator_wrapper's constructor due to the ITERATOR_VERIFY check therein.
Instead of delegating to this constructor it seems we can just inherit the
protected default constructor, which does not contain this ITERATOR_VERIFY
check.
libstdc++-v3/ChangeLog:
* include/std/ranges (split_view::_OuterIter::_OuterIter): Typo fix,
'address' -> 'std::__addressof'.
* testsuite/std/ranges/adaptors/split.cc: Test taking the split_view of
a non-forward input_range.
* testsuite/util/testsuite_iterators.h (output_iterator_wrapper): Make
default constructor protected instead of deleted, like with
input_iterator_wrapper.
(test_range::iterator): Add comment explaining that this type is used
only when the underlying wrapper is input_iterator_wrapper or
output_iterator_wrapper. Remove delegating defaulted constructor so
that the inherited default constructor is used instead.
---
libstdc++-v3/include/std/ranges | 2 +-
.../testsuite/std/ranges/adaptors/split.cc | 20 +++++++++++++++++++
.../testsuite/util/testsuite_iterators.h | 14 ++++++++-----
3 files changed, 30 insertions(+), 6 deletions(-)
diff --git a/libstdc++-v3/include/std/ranges b/libstdc++-v3/include/std/ranges
index 23396947ac3..f4faec463e8 100644
--- a/libstdc++-v3/include/std/ranges
+++ b/libstdc++-v3/include/std/ranges
@@ -2786,7 +2786,7 @@ namespace views
constexpr explicit
_OuterIter(_Parent& __parent) requires (!forward_range<_Base>)
- : _M_parent(address(__parent))
+ : _M_parent(std::__addressof(__parent))
{ }
constexpr
diff --git a/libstdc++-v3/testsuite/std/ranges/adaptors/split.cc b/libstdc++-v3/testsuite/std/ranges/adaptors/split.cc
index abdbfb41d8b..fe895827fc5 100644
--- a/libstdc++-v3/testsuite/std/ranges/adaptors/split.cc
+++ b/libstdc++-v3/testsuite/std/ranges/adaptors/split.cc
@@ -27,6 +27,7 @@
using __gnu_test::test_range;
using __gnu_test::forward_iterator_wrapper;
+using __gnu_test::input_iterator_wrapper;
namespace ranges = std::ranges;
namespace views = std::ranges::views;
@@ -133,6 +134,24 @@ test07()
static_assert( noexcept(iter_swap(b, b2)) );
}
+void
+test08()
+{
+ char x[] = "the quick brown fox";
+ test_range<char, input_iterator_wrapper> rx(x, x+sizeof(x)-1);
+ auto v = rx | views::split(' ');
+ auto i = v.begin();
+ VERIFY( ranges::equal(*i, "the"sv) );
+ ++i;
+ VERIFY( ranges::equal(*i, "quick"sv) );
+ ++i;
+ VERIFY( ranges::equal(*i, "brown"sv) );
+ ++i;
+ VERIFY( ranges::equal(*i, "fox"sv) );
+ ++i;
+ VERIFY( i == v.end() );
+}
+
int
main()
{
@@ -143,4 +162,5 @@ main()
test05();
test06();
test07();
+ test08();
}
diff --git a/libstdc++-v3/testsuite/util/testsuite_iterators.h b/libstdc++-v3/testsuite/util/testsuite_iterators.h
index a915c02248b..5be47f47915 100644
--- a/libstdc++-v3/testsuite/util/testsuite_iterators.h
+++ b/libstdc++-v3/testsuite/util/testsuite_iterators.h
@@ -124,6 +124,11 @@ namespace __gnu_test
struct output_iterator_wrapper
: public std::iterator<std::output_iterator_tag, T, std::ptrdiff_t, T*, T&>
{
+ protected:
+ output_iterator_wrapper() : ptr(0), SharedInfo(0)
+ { }
+
+ public:
typedef OutputContainer<T> ContainerType;
T* ptr;
ContainerType* SharedInfo;
@@ -135,8 +140,6 @@ namespace __gnu_test
}
#if __cplusplus >= 201103L
- output_iterator_wrapper() = delete;
-
output_iterator_wrapper(const output_iterator_wrapper&) = default;
output_iterator_wrapper&
@@ -706,13 +709,14 @@ namespace __gnu_test
template<typename T, template<typename> class Iter>
class test_range
{
- // Adds default constructor to Iter<T> if needed
+ // Exposes the protected default constructor of Iter<T> if needed. This
+ // is needed only when Iter is input_iterator_wrapper or
+ // output_iterator_wrapper, because legacy forward iterators and beyond
+ // are already default constructible.
struct iterator : Iter<T>
{
using Iter<T>::Iter;
- iterator() : Iter<T>(nullptr, nullptr) { }
-
using Iter<T>::operator++;
iterator& operator++() { Iter<T>::operator++(); return *this; }
--
2.26.0.rc1
next reply other threads:[~2020-03-11 15:47 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-11 15:46 Patrick Palka [this message]
2020-03-11 15:57 ` Jonathan Wakely
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