被 cgo 的 union 折磨的不要不要的

typedef struct tagVARIANT {
	 union 
	{
		 struct
		{
			VARTYPE vt;
			 union
			{
				int64_t llVal;
				int32_t lVal;
				int16_t iVal;
				int8_t bVal;
				float fltVal;
				double dblVal;
				double date;
				char* cstrVal;
				short* bstrVal;
				void* pyref;
				int8_t* pbVal;
				int16_t* piVal;
				int32_t* plVal;
				int64_t* pllVal;
				float* pfltVal;
				double* pdblVal;
				double* pdate;
				char** pcstrVal;
				short** pbstrVal;
				SAFEARRAY* parray;
				VARIANT* pvarVal;
			} __VARIANT_NAME_3;
		} __VARIANT_NAME_2;
	} __VARIANT_NAME_1;
} tagVARIANT;

cgo 处理 union 太痛苦了，大家有什么好的解决办法吗？谢谢。