D语言中的简单运算符重载会引发异常

Question

这段代码:

class C 
{
    int opAdd(C b) { return 1; }
    private int j;
}

void main() 
{
    C a;
    C c;

    int j = a + c;
}

抛出:

"object.Exception: Access Violate - Read at address 0x0"

Answer 1

D中的类是引用类型.您需要实例化它们:

C a = new C();
C b = new C();

此外,opAdd已opBinary!"+"在D2中替换(参见D2运算符重载).