mamodev opened a new issue, #329:
URL: https://github.com/apache/tvm-ffi/issues/329
# Summary
When attempting to register a constructor that accepts tvm::ffi::Any using
the reflection system (refl::init), compilation fails. The error indicates that
the TypeTraits template for tvm::ffi::Any (specifically TypeTraitsNoCR) is
missing the TypeStr() member function, which is required to generate the
function signature string for Python bindings.
# Steps to Reproduce
the following minimal C++ snippet reproduces the error when compiled against
tvm_ffi:
```cpp
#include <tvm/ffi/reflection/registry.h>
#include <tvm/ffi/any.h>
using namespace tvm::ffi;
struct MyNode : Object {
// Constructor accepting Any
MyNode(Any a) {}
TVM_FFI_DECLARE_OBJECT_INFO_FINAL("mod.MyNode", MyNode, Object);
};
TVM_FFI_STATIC_INIT_BLOCK() {
namespace refl = tvm::ffi::reflection;
refl::ObjectDef<MyNode>()
.def(refl::init<Any>()); // This line triggers the
compilation error
}
```
### Example of error
```
/include/tvm/ffi/any.h: In instantiation of ‘static std::string
tvm::ffi::details::Type2Str<Type>::v() [with Type = tvm::ffi::Any&&;
std::string = std::__cxx11::basic_string<char>]’:
...
/include/tvm/ffi/any.h:506:64: error: ‘TypeStr’ is not a member of
‘tvm::ffi::TypeTraitsNoCR<tvm::ffi::Any&&>’ {aka
‘tvm::ffi::TypeTraits<tvm::ffi::Any, void>’}
506 | static std::string v() { return TypeTraitsNoCR<Type>::TypeStr(); }
```
# Context
**Compiler**: G++ (C++17 standard)
**Package**: standalone tvm_ffi (via PyPI)
**Use Case**: Trying to expose a constructor that accepts either a primitive
(int/float) or an ObjectRef.
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