下表显示了一元运算符，其目的列表。
| 函数名称 | 运算符 | 目的 |
|---|---|---|
| opUnary | - | 负数(数字补) |
| opUnary | + | 相同值(或者，副本) |
| opUnary | ~ | 按位取反 |
| opUnary | * | 访问指向 |
| opUnary | ++ | 自增 |
| opUnary | -- | 自减 |
一个例子如下，解释如何重载一个二元运算符。
import std.stdio class Box { public: double getVolume() { return length * breadth * height } void setLength( double len ) { length = len } void setBreadth( double bre ) { breadth = bre } void setHeight( double hei ) { height = hei } Box opUnary(string op)() { if(op == "++") { Box box = new Box() box.length = this.length + 1 box.breadth = this.breadth + 1 box.height = this.height + 1 return box } } private: double length // Length of a box double breadth // Breadth of a box double height // Height of a box } // Main function for the program void main( ) { Box Box1 = new Box() // Declare Box1 of type Box Box Box2 = new Box() // Declare Box2 of type Box double volume = 0.0 // Store the volume of a box here // box 1 specification Box1.setLength(6.0) Box1.setBreadth(7.0) Box1.setHeight(5.0) // volume of box 1 volume = Box1.getVolume() writeln("Volume of Box1 : ", volume) // Add two object as follows: Box2 = ++Box1 // volume of box2 volume = Box2.getVolume() writeln("Volume of Box2 : ", volume) }
让我们编译和运行上面的程序，这将产生以下结果：
Volume of Box1 : 210 Volume of Box2 : 336