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1
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1 struct S
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2 {
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3 int i;
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4 int square()
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5 {
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6 return i*i;
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7 }
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8 int plus(int a)
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9 {
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10 return i + a;
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11 }
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12 int minus(int a)
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13 {
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14 return i - a;
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15 }
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16 int delegate(int) get(char op)
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17 {
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18 int delegate(int) rval;
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19 if (op == '+')
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20 rval = +
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21 else if (op == '-')
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22 rval = −
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23 return rval;
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24 }
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25 }
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26
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27 int calldg1(int delegate(int) dg, int i)
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28 {
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29 return dg(i);
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30 }
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31
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32 void delegate() retdg()
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33 {
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34 void delegate() dg;
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35 return dg;
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36 }
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37
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38 void getretdg()
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39 {
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40 void delegate() dg;
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41 dg = retdg();
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42 }
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43
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44 class C
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45 {
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46 int i;
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47 void m()
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48 {
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49 i = 42;
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50 }
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51 }
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52
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53 void getclassdg()
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54 {
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55 scope c = new C;
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56 void delegate() dg = &c.m;
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57 assert(c.i != 42);
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58 dg();
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59 assert(c.i == 42);
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60 }
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61
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62 void main()
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63 {
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64 printf("Delegate test\n");
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65 S s = S(4);
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66
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67 auto dg = &s.square;
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68 //assert(dg() == 16);
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69 //dg();
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70
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71 /*auto dg1 = &s.plus;
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72 assert(dg1(6) == 10);
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73
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74 auto dg2 = &s.minus;
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75 assert(calldg1(dg2,30) == -26);
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76
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77 auto dg3 = s.get('+');
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78 assert(dg3(16) == 20);
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79
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80 getretdg();
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81 getclassdg();*/
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82
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83 printf(" SUCCESS\n");
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84 }
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