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131
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1 // P1064R0
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2 // { dg-do compile }
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3 // { dg-options "-std=c++2a" }
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4
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5 struct X1
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6 {
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7 virtual int f() const = 0;
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8 };
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9
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10 struct X2: public X1
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11 {
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12 constexpr virtual int f() const { return 2; }
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13 };
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14
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15 struct X3: public X2
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16 {
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17 virtual int f() const { return 3; }
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18 };
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19
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20 struct X4: public X3
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21 {
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22 constexpr virtual int f() const { return 4; }
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23 };
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24
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25 constexpr int (X1::*pf)() const = &X1::f;
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26
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27 constexpr X2 x2;
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28
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29 struct S
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30 {
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31 int i, j;
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32 constexpr S() : i(x2.f()), j((x2.*pf)()) { }
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33 };
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34
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35 static_assert(S().i == 2);
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36 static_assert(S().j == 2);
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37
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38 constexpr X1 const& r2 = x2;
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39
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40 struct S2
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41 {
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42 int i, j;
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43 constexpr S2() : i(r2.f()), j((r2.*pf)()) { }
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44 };
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45
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46 static_assert(S2().i == 2);
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47 static_assert(S2().j == 2);
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48
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49 constexpr X1 const* p2 = &x2;
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50 struct S3
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51 {
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52 int i, j;
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53 constexpr S3() : i(p2->f()), j((p2->*pf)()) { }
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54 };
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55
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56 static_assert(S3().i == 2);
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57 static_assert(S3().j == 2);
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58
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59 constexpr X4 x4;
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60 struct S4
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61 {
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62 int i, j;
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63 constexpr S4() : i(x4.f()), j((x4.*pf)()) { }
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64 };
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65
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66 static_assert(S4().i == 4);
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67 static_assert(S4().j == 4);
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68
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69 constexpr X1 const& r4 = x4;
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70 struct S5
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71 {
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72 int i, j;
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73 constexpr S5() : i(r4.f()), j((r4.*pf)()) { }
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74 };
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75
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76 static_assert(S5().i == 4);
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77 static_assert(S5().j == 4);
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78
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79 constexpr X1 const* p4 = &x4;
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80 struct S6
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81 {
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82 int i, j;
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83 constexpr S6() : i(p4->f()), j((p4->*pf)()) { }
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84 };
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85
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86 static_assert(S6().i == 4);
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87 static_assert(S6().j == 4);
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