'C++ / Swift callback in Metal Framework method newBufferWithBytesNoCopy

I want to call the method newBufferWithBytesNoCopy from C++. This method is part of Apples Metal framework and is defined as this:

_MTL_INLINE MTL::Buffer* MTL::Device::newBuffer(const void* pointer,
                                                NS::UInteger length,
                                                MTL::ResourceOptions options,
                                                const void (^deallocator)(void*, NS::UInteger))

The last parameter deallocator defines a callback, which gets called when the buffer gets destroyed. I tried to use a function pointer, but my compiler complains:

no known conversion from 'void (void *, NS::UInteger)' (aka 'void (void *, unsigned long)') to 'const void (^)(void *, NS::UInteger)' for 4th argument
_MTL_INLINE MTL::Buffer* MTL::Device::newBuffer(const void* pointer, NS::UInteger length, MTL::ResourceOptions options, const void (^deallocator)(void*, NS::UInteger))

Does anyone can show me how to provide a callback to this method?

c++swiftmetal


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