[libcxx-commits] [libcxx] [libc++][test] Only `views::split(pattern)` can be piped (PR #74961)

[Stephan T. Lavavej via libcxx-commits]

https://github.com/StephanTLavavej updated https://github.com/llvm/llvm-project/pull/74961

>From 8dd5359fc253e27f2233b43c57c70eb00f13a914 Mon Sep 17 00:00:00 2001
From: "Stephan T. Lavavej" <stl at nuwen.net>
Date: Thu, 7 Dec 2023 22:10:42 -0800
Subject: [PATCH 1/2] Fix range.split/adaptor.pass.cpp; only views::split('x')
 can be piped.

This was failing with:

D:\GitHub\STL\llvm-project\libcxx\test\std\ranges\range.adaptors\range.split\adaptor.pass.cpp(42,1): error: static assertion failed
static_assert( CanBePiped<SomeView&,    decltype(std::views::split)>);
^              ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
D:\GitHub\STL\llvm-project\libcxx\test\std\ranges\range.adaptors\range.split\adaptor.pass.cpp(42,16): note: because 'CanBePiped<SomeView &, decltype(std::views::split)>' evaluated to false
static_assert( CanBePiped<SomeView&,    decltype(std::views::split)>);
               ^
D:\GitHub\STL\llvm-project\libcxx\test\std\ranges\range.adaptors\range.split\adaptor.pass.cpp(25,30): note: because 'std::forward<View>(view) | std::forward<T>(t)' would be invalid: invalid operands to binary expression ('SomeView' and 'const std::ranges::views::_Split_fn')
  { std::forward<View>(view) | std::forward<T>(t) };
                             ^
D:\GitHub\STL\llvm-project\libcxx\test\std\ranges\range.adaptors\range.split\adaptor.pass.cpp(43,1): error: static assertion failed
static_assert( CanBePiped<char(&)[10],  decltype(std::views::split)>);
^              ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
D:\GitHub\STL\llvm-project\libcxx\test\std\ranges\range.adaptors\range.split\adaptor.pass.cpp(43,16): note: because 'CanBePiped<char (&)[10], decltype(std::views::split)>' evaluated to false
static_assert( CanBePiped<char(&)[10],  decltype(std::views::split)>);
               ^
D:\GitHub\STL\llvm-project\libcxx\test\std\ranges\range.adaptors\range.split\adaptor.pass.cpp(25,30): note: because 'std::forward<View>(view) | std::forward<T>(t)' would be invalid: invalid operands to binary expression ('char[10]' and 'const std::ranges::views::_Split_fn')
  { std::forward<View>(view) | std::forward<T>(t) };
                             ^

Similarly for range.lazy.split/adaptor.pass.cpp.
---
 .../range.adaptors/range.lazy.split/adaptor.pass.cpp      | 8 ++++----
 .../ranges/range.adaptors/range.split/adaptor.pass.cpp    | 8 ++++----
 2 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/libcxx/test/std/ranges/range.adaptors/range.lazy.split/adaptor.pass.cpp b/libcxx/test/std/ranges/range.adaptors/range.lazy.split/adaptor.pass.cpp
index da4bd9fbbe1794..58be3713263c73 100644
--- a/libcxx/test/std/ranges/range.adaptors/range.lazy.split/adaptor.pass.cpp
+++ b/libcxx/test/std/ranges/range.adaptors/range.lazy.split/adaptor.pass.cpp
@@ -40,10 +40,10 @@ static_assert(!std::is_invocable_v<decltype(std::views::lazy_split), SomeView, N
 static_assert(!std::is_invocable_v<decltype(std::views::lazy_split), NotAView, SomeView>);
 static_assert( std::is_invocable_v<decltype(std::views::lazy_split), SomeView, SomeView>);
 
-static_assert( CanBePiped<SomeView&,    decltype(std::views::lazy_split)>);
-static_assert( CanBePiped<char(&)[10],  decltype(std::views::lazy_split)>);
-static_assert(!CanBePiped<char(&&)[10], decltype(std::views::lazy_split)>);
-static_assert(!CanBePiped<NotAView,     decltype(std::views::lazy_split)>);
+static_assert( CanBePiped<SomeView&,    decltype(std::views::lazy_split('x'))>);
+static_assert( CanBePiped<char(&)[10],  decltype(std::views::lazy_split('x'))>);
+static_assert(!CanBePiped<char(&&)[10], decltype(std::views::lazy_split('x'))>);
+static_assert(!CanBePiped<NotAView,     decltype(std::views::lazy_split('x'))>);
 
 static_assert(std::same_as<decltype(std::views::lazy_split), decltype(std::ranges::views::lazy_split)>);
 
diff --git a/libcxx/test/std/ranges/range.adaptors/range.split/adaptor.pass.cpp b/libcxx/test/std/ranges/range.adaptors/range.split/adaptor.pass.cpp
index cd12011daeab5d..4b13d1b361198f 100644
--- a/libcxx/test/std/ranges/range.adaptors/range.split/adaptor.pass.cpp
+++ b/libcxx/test/std/ranges/range.adaptors/range.split/adaptor.pass.cpp
@@ -39,10 +39,10 @@ static_assert(!std::is_invocable_v<decltype(std::views::split), SomeView, NotAVi
 static_assert(!std::is_invocable_v<decltype(std::views::split), NotAView, SomeView>);
 static_assert( std::is_invocable_v<decltype(std::views::split), SomeView, SomeView>);
 
-static_assert( CanBePiped<SomeView&,    decltype(std::views::split)>);
-static_assert( CanBePiped<char(&)[10],  decltype(std::views::split)>);
-static_assert(!CanBePiped<char(&&)[10], decltype(std::views::split)>);
-static_assert(!CanBePiped<NotAView,     decltype(std::views::split)>);
+static_assert( CanBePiped<SomeView&,    decltype(std::views::split('x'))>);
+static_assert( CanBePiped<char(&)[10],  decltype(std::views::split('x'))>);
+static_assert(!CanBePiped<char(&&)[10], decltype(std::views::split('x'))>);
+static_assert(!CanBePiped<NotAView,     decltype(std::views::split('x'))>);
 
 static_assert(std::same_as<decltype(std::views::split), decltype(std::ranges::views::split)>);
 

>From e9ffcc0d58b6d6f9a081f5c65d43d51fbbf623fc Mon Sep 17 00:00:00 2001
From: "Stephan T. Lavavej" <stl at nuwen.net>
Date: Sat, 9 Dec 2023 19:05:52 -0800
Subject: [PATCH 2/2] Apply clang-format from CI.

---
 .../range.adaptors/range.lazy.split/adaptor.pass.cpp      | 8 ++++----
 .../ranges/range.adaptors/range.split/adaptor.pass.cpp    | 8 ++++----
 2 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/libcxx/test/std/ranges/range.adaptors/range.lazy.split/adaptor.pass.cpp b/libcxx/test/std/ranges/range.adaptors/range.lazy.split/adaptor.pass.cpp
index 58be3713263c73..aae5b6e54f6484 100644
--- a/libcxx/test/std/ranges/range.adaptors/range.lazy.split/adaptor.pass.cpp
+++ b/libcxx/test/std/ranges/range.adaptors/range.lazy.split/adaptor.pass.cpp
@@ -40,10 +40,10 @@ static_assert(!std::is_invocable_v<decltype(std::views::lazy_split), SomeView, N
 static_assert(!std::is_invocable_v<decltype(std::views::lazy_split), NotAView, SomeView>);
 static_assert( std::is_invocable_v<decltype(std::views::lazy_split), SomeView, SomeView>);
 
-static_assert( CanBePiped<SomeView&,    decltype(std::views::lazy_split('x'))>);
-static_assert( CanBePiped<char(&)[10],  decltype(std::views::lazy_split('x'))>);
-static_assert(!CanBePiped<char(&&)[10], decltype(std::views::lazy_split('x'))>);
-static_assert(!CanBePiped<NotAView,     decltype(std::views::lazy_split('x'))>);
+static_assert(CanBePiped<SomeView&, decltype(std::views::lazy_split('x'))>);
+static_assert(CanBePiped<char (&)[10], decltype(std::views::lazy_split('x'))>);
+static_assert(!CanBePiped<char (&&)[10], decltype(std::views::lazy_split('x'))>);
+static_assert(!CanBePiped<NotAView, decltype(std::views::lazy_split('x'))>);
 
 static_assert(std::same_as<decltype(std::views::lazy_split), decltype(std::ranges::views::lazy_split)>);
 
diff --git a/libcxx/test/std/ranges/range.adaptors/range.split/adaptor.pass.cpp b/libcxx/test/std/ranges/range.adaptors/range.split/adaptor.pass.cpp
index 4b13d1b361198f..5bf2d56090e8fd 100644
--- a/libcxx/test/std/ranges/range.adaptors/range.split/adaptor.pass.cpp
+++ b/libcxx/test/std/ranges/range.adaptors/range.split/adaptor.pass.cpp
@@ -39,10 +39,10 @@ static_assert(!std::is_invocable_v<decltype(std::views::split), SomeView, NotAVi
 static_assert(!std::is_invocable_v<decltype(std::views::split), NotAView, SomeView>);
 static_assert( std::is_invocable_v<decltype(std::views::split), SomeView, SomeView>);
 
-static_assert( CanBePiped<SomeView&,    decltype(std::views::split('x'))>);
-static_assert( CanBePiped<char(&)[10],  decltype(std::views::split('x'))>);
-static_assert(!CanBePiped<char(&&)[10], decltype(std::views::split('x'))>);
-static_assert(!CanBePiped<NotAView,     decltype(std::views::split('x'))>);
+static_assert(CanBePiped<SomeView&, decltype(std::views::split('x'))>);
+static_assert(CanBePiped<char (&)[10], decltype(std::views::split('x'))>);
+static_assert(!CanBePiped<char (&&)[10], decltype(std::views::split('x'))>);
+static_assert(!CanBePiped<NotAView, decltype(std::views::split('x'))>);
 
 static_assert(std::same_as<decltype(std::views::split), decltype(std::ranges::views::split)>);