[libcxx-commits] [libcxx] [libc++] Add container_traits (prework for `std::flat_map`) (PR #109578)

[Louis Dionne via libcxx-commits]

================
@@ -1544,6 +1545,17 @@ erase(forward_list<_Tp, _Allocator>& __c, const _Up& __v) {
 }
 #endif
 
+template <class _Tp, class _Allocator>
+struct __container_traits<forward_list<_Tp, _Allocator> > {
+  // http://eel.is/c++draft/container.reqmts
+  // 66 Unless otherwise specified (see [associative.reqmts.except], [unord.req.except], [deque.modifiers],
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ldionne wrote:

```suggestion
  // Unless otherwise specified (see [associative.reqmts.except], [unord.req.except], [deque.modifiers],
```

https://github.com/llvm/llvm-project/pull/109578