[libcxx-commits] [libcxx] [libc++] Optimize standard streams with sync_with_stdio(false) (PR #209161)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions ,cpp -- libcxx/test/libcxx/input.output/iostream.objects/sync_with_stdio.buffer_type.pass.cpp libcxx/test/std/input.output/iostream.objects/narrow.stream.objects/cerr.sync_with_stdio.sh.cpp libcxx/test/std/input.output/iostream.objects/narrow.stream.objects/cin.readmany.sh.cpp libcxx/test/std/input.output/iostream.objects/narrow.stream.objects/cin.sync_with_stdio.sh.cpp libcxx/test/std/input.output/iostream.objects/narrow.stream.objects/clog.sync_with_stdio.sh.cpp libcxx/test/std/input.output/iostream.objects/narrow.stream.objects/cout.interleave_with_stdio.sh.cpp libcxx/test/std/input.output/iostream.objects/narrow.stream.objects/cout.sync_with_stdio.sh.cpp libcxx/test/std/input.output/iostream.objects/sync_with_stdio.state.pass.cpp libcxx/test/std/input.output/iostream.objects/wide.stream.objects/wcerr.sync_with_stdio.sh.cpp libcxx/test/std/input.output/iostream.objects/wide.stream.objects/wcin.readmany.sh.cpp libcxx/test/std/input.output/iostream.objects/wide.stream.objects/wcin.sync_with_stdio.sh.cpp libcxx/test/std/input.output/iostream.objects/wide.stream.objects/wclog.sync_with_stdio.sh.cpp libcxx/test/std/input.output/iostream.objects/wide.stream.objects/wcout.sync_with_stdio.sh.cpp libcxx/include/fstream libcxx/src/ios.cpp libcxx/src/iostream.cpp libcxx/test/std/input.output/iostreams.base/ios.base/ios.members.static/sync_with_stdio.pass.cpp --diff_from_common_commit
``````````

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``````````diff
diff --git a/libcxx/test/std/input.output/iostreams.base/ios.base/ios.members.static/sync_with_stdio.pass.cpp b/libcxx/test/std/input.output/iostreams.base/ios.base/ios.members.static/sync_with_stdio.pass.cpp
index 3051f0dc3..17251cdf4 100644
--- a/libcxx/test/std/input.output/iostreams.base/ios.base/ios.members.static/sync_with_stdio.pass.cpp
+++ b/libcxx/test/std/input.output/iostreams.base/ios.base/ios.members.static/sync_with_stdio.pass.cpp
@@ -17,16 +17,16 @@
 
 int main(int, char**)
 {
-    ASSERT_SAME_TYPE(decltype(std::ios_base::sync_with_stdio(false)), bool);
+  ASSERT_SAME_TYPE(decltype(std::ios_base::sync_with_stdio(false)), bool);
 
-    assert( std::ios_base::sync_with_stdio(false));
-    assert(!std::ios_base::sync_with_stdio(false));
-    assert(!std::ios_base::sync_with_stdio(true));
-    assert( std::ios_base::sync_with_stdio(true));
-    assert( std::ios_base::sync_with_stdio());
-    assert( std::ios_base::sync_with_stdio(false));
-    assert(!std::ios_base::sync_with_stdio());
-    assert( std::ios_base::sync_with_stdio());
+  assert(std::ios_base::sync_with_stdio(false));
+  assert(!std::ios_base::sync_with_stdio(false));
+  assert(!std::ios_base::sync_with_stdio(true));
+  assert(std::ios_base::sync_with_stdio(true));
+  assert(std::ios_base::sync_with_stdio());
+  assert(std::ios_base::sync_with_stdio(false));
+  assert(!std::ios_base::sync_with_stdio());
+  assert(std::ios_base::sync_with_stdio());
 
   return 0;
 }

``````````

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https://github.com/llvm/llvm-project/pull/209161