下面的代码应该表明我的意思是您是否可以在参数中使用模板化函数typedef...#includestructvec2{floatx,y;};structdvec2{doublex,y;};templatevoidfunction(std::vector&list,decltype(T::x)scalarVal,decltype(T::x)scalarVal2){typedefdecltype(T::x)scalarType;scalarTypea;//aisnowadoubleorfloatdependingontemplateargument}intmain(){std::vecto

在cloudera的Impala指南中(https://www.cloudera.com/documentation/enterprise/5-8-x/topics/impala_conversion_functions.html)有一个示例演示了如何使用typeof()函数来检查数值表达式的返回数据类型:+--------------------------+|typeof(5.30001/2342.1)|+--------------------------+|DECIMAL(13,11)|+--------------------------+当我这样做时:selecttypeo