有没有办法在C ++中显式调用可选参数？

当我创建一个函数时，例如：

int addThree(int x=1, int y=1, int z=1)

我想调用该函数，使其使用x和z的默认参数，但不使用y。

Some attempts have been addThree(5,,5) and addThree(5,NULL,5), but neither work effectively. Hopefully these help convey my question better.

感谢任何帮助。干杯!