================
@@ -0,0 +1,137 @@
+//===---------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM 
Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "LibStdcpp.h"
+
+#include "lldb/DataFormatters/TypeSynthetic.h"
+#include "lldb/Utility/ConstString.h"
+#include "lldb/ValueObject/ValueObject.h"
+#include "lldb/lldb-enumerations.h"
+#include "llvm/Support/Error.h"
+
+using namespace lldb;
+
+namespace lldb_private::formatters {
+
+class LibStdcppAtomicSyntheticFrontEnd final
+    : public SyntheticChildrenFrontEnd {
+public:
+  explicit LibStdcppAtomicSyntheticFrontEnd(ValueObject &valobj)
+      : SyntheticChildrenFrontEnd(valobj) {}
+
+  llvm::Expected<uint32_t> CalculateNumChildren() final {
+    if (!m_inner)
+      return llvm::createStringError("Invalid atomic ValueObject.");
+    return 1;
+  }
+
+  ValueObjectSP GetChildAtIndex(uint32_t idx) final {
+    if (idx == 0 && m_inner)
+      return m_inner->GetSP()->Clone(k_inner_name);
+
+    return {};
+  }
+
+  lldb::ChildCacheState Update() final {
+    if (ValueObjectSP value = ContainerFieldName(m_backend)) {
+      // show the Type, instead of std::__atomic_base<Type>::__Type_type.
+      value = value->Cast(value->GetCompilerType().GetCanonicalType());
+      m_inner = value.get();
+    }
+
+    return lldb::ChildCacheState::eRefetch;
+  }
+
+  llvm::Expected<size_t> GetIndexOfChildWithName(ConstString name) final {
+    if (name == k_inner_name)
+      return 0;
+
+    return llvm::createStringError("Type has no child named '%s'",
+                                   name.AsCString());
+  }
+
+  static ValueObjectSP ContainerFieldName(ValueObject &backend_syn) {
+    const ValueObjectSP non_synthetic = backend_syn.GetNonSyntheticValue();
+    if (!non_synthetic)
+      return {};
+    ValueObject &backend = *non_synthetic;
+
+    const CompilerType type = backend.GetCompilerType();
+    if (!type || type.GetNumTemplateArguments() < 1)
+      return {};
+
+    const CompilerType first_type = type.GetTypeTemplateArgument(0);
+    if (!first_type)
+      return {};
+
+    const lldb::BasicType basic_type = first_type.GetBasicTypeEnumeration();
+    if (basic_type == eBasicTypeBool)
----------------
Michael137 wrote:

```suggestion
    if (first_type.IsBoolean())
```

https://github.com/llvm/llvm-project/pull/174218
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