In your code omitting void don't affect the code. However, if you leave out void(), for future changes the code might run into issues down the line.

For example, if insert ever starts returning a type that has its own custom comma operator, things could break or behave unexpectedly. Plus, some compilers might throw warnings about unused return values, which can clutter your build output.

A good rule of thumb is to use void() to explicitly ignore results. This makes your intentions clear and keeps the code robust. It’s a standard trick in C++ for cases where you don’t care about the result of an expression but still want to ensure everything works as expected.