下表显示了二元运算符，其目的列表。
| 函数名称 | 运算符 | 目的 |
|---|---|---|
| opBinary | + | 加法 |
| opBinary | - | 减法 |
| opBinary | * | 乘法 |
| opBinary | / | 除法 |
| opBinary | % | 求余 |
| opBinary | ^^ | 幂 |
| opBinary | & | 按位与 |
| opBinary | | | 按位或 |
| opBinary | ^ | 按位异或 |
| opBinary | << | 左移 |
| opBinary | >> | 右移 |
| opBinary | >>> | 逻辑右移 |
| opBinary | ~ | 串连 |
| opBinary | in | 是否包含 |
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 opBinary(string op)(Box b) { if(op == "+") { Box box = new Box() box.length = this.length + b.length box.breadth = this.breadth + b.breadth box.height = this.height + b.height 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 Box box3 = new Box() // Declare Box3 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) // box 2 specification box2.setLength(12.0) box2.setBreadth(13.0) box2.setHeight(10.0) // volume of box 1 volume = box1.getVolume() writeln("Volume of Box1 : ", volume) // volume of box 2 volume = box2.getVolume() writeln("Volume of Box2 : ", volume) // Add two object as follows: box3 = box1 + box2 // volume of box 3 volume = box3.getVolume() writeln("Volume of Box3 : ", 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 : 1560 Volume of Box3 : 5400