Message ID | 20200305162409.2723743-1-ppalka@redhat.com |
---|---|
State | New |
Headers | show |
Series | None | expand |
On 05/03/20 11:24 -0500, Patrick Palka wrote: >The converting constructor of join_view::_Sentinel<true> needs to be able to >access the private members of join_view::_Sentinel<false>. > >libstdc++-v3/ChangeLog: > > * include/std/ranges (join_view::_Sentinel<_Const>): Befriend > join_view::_Sentinel<!_Const>. > * testsuite/std/ranges/adaptors/join.cc: Augment test. OK.
On Thu, 5 Mar 2020, Jonathan Wakely wrote: > On 05/03/20 11:24 -0500, Patrick Palka wrote: > > The converting constructor of join_view::_Sentinel<true> needs to be able to > > access the private members of join_view::_Sentinel<false>. > > > > libstdc++-v3/ChangeLog: > > > > * include/std/ranges (join_view::_Sentinel<_Const>): Befriend > > join_view::_Sentinel<!_Const>. > > * testsuite/std/ranges/adaptors/join.cc: Augment test. > > OK. Thanks for the review. Unfortunately the added test fails to compile without first a fix for PR 93978 (or alternatively, we can add -O0 to dg-options in join.cc).
diff --git a/libstdc++-v3/include/std/ranges b/libstdc++-v3/include/std/ranges index 57edc895e3d..16195812b70 100644 --- a/libstdc++-v3/include/std/ranges +++ b/libstdc++-v3/include/std/ranges @@ -2593,6 +2593,8 @@ namespace views friend constexpr bool operator==(const _Iterator<_Const>& __x, const _Sentinel& __y) { return __y.__equal(__x); } + + friend _Sentinel<!_Const>; }; _Vp _M_base = _Vp(); diff --git a/libstdc++-v3/testsuite/std/ranges/adaptors/join.cc b/libstdc++-v3/testsuite/std/ranges/adaptors/join.cc index d3e652da009..142c9feddcd 100644 --- a/libstdc++-v3/testsuite/std/ranges/adaptors/join.cc +++ b/libstdc++-v3/testsuite/std/ranges/adaptors/join.cc @@ -101,6 +101,28 @@ test05() VERIFY( i == v.end() ); } +void +test06() +{ + std::vector<std::string> x = {""}; + auto i = std::counted_iterator(x.begin(), 1); + auto r = ranges::subrange{i, std::default_sentinel}; + auto v = r | views::transform(std::identity{}) | views::join; + + // Verify that _Iterator<false> is implicitly convertible to _Iterator<true>. + static_assert(!std::same_as<decltype(ranges::begin(v)), + decltype(ranges::cbegin(v))>); + auto a = ranges::cbegin(v); + a = ranges::begin(v); + + // Verify that _Sentinel<false> is implicitly convertible to _Sentinel<true>. + static_assert(!ranges::common_range<decltype(v)>); + static_assert(!std::same_as<decltype(ranges::end(v)), + decltype(ranges::cend(v))>); + auto b = ranges::cend(v); + b = ranges::end(v); +} + int main() { @@ -109,4 +131,5 @@ main() test03(); test04(); test05(); + test06(); }