[libcxx-commits] [libcxx] [libcxx][string] Test: default constructed allocators can be unequal (PR #195839)

[A. Jiang via libcxx-commits]

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@@ -67,7 +67,10 @@ TEST_CONSTEXPR_CXX20 void test2() {
     assert(s.data());
     assert(s.size() == 0);
     assert(s.capacity() >= s.size());
-    assert(s.get_allocator() == typename S::allocator_type());
+#  if TEST_STD_VER >= 11
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frederick-vs-ja wrote:

> `decltype` is a C++11+ keyword, which, I believe, is a stronger limitation than library functionality that can be backported.

This is true. But Clang provides extension `__decltype` equivalent to `decltype`, and libc++ defines `decltype` as a macro expanding to `__decltype`. As a result, we can just use `decltype` in C++03 mode in libc++ test suite.

https://github.com/llvm/llvm-project/pull/195839