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145
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1 // P0784R7
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2 // { dg-do compile { target c++2a } }
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3
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4 struct S
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5 {
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6 constexpr S () : s (0) {}
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7 constexpr ~S () {}
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8 int s;
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9 };
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10 struct T // { dg-message "'T' is not literal because" }
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11 { // { dg-message "'T' does not have 'constexpr' destructor" "" { target *-*-* } .-1 }
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12 constexpr T () : t (0) {}
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13 ~T () {} // { dg-message "defaulted destructor calls non-'constexpr' 'T::~T\\(\\)'" }
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14 int t;
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15 };
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16 struct U : public S
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17 {
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18 constexpr U () : u (0) {}
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19 constexpr ~U () = default; // { dg-error "explicitly defaulted function 'constexpr U::~U\\(\\)' cannot be declared 'constexpr' because the implicit declaration is not 'constexpr'" }
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20 int u;
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21 T t;
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22 };
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23 struct V : virtual public S
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24 {
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25 V () : v (0) {}
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26 constexpr ~V () = default; // { dg-error "explicitly defaulted function 'constexpr V::~V\\(\\)' cannot be declared 'constexpr' because the implicit declaration is not 'constexpr'" }
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27 int v;
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28 };
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29 struct W0
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30 {
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31 constexpr W0 () : w (0) {}
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32 constexpr W0 (int x) : w (x) {}
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33 constexpr ~W0 () { if (w == 5) asm (""); w = 3; }
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34 int w;
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35 };
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36 struct W1
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37 {
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38 constexpr W1 () : w (0) {}
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39 constexpr W1 (int x) : w (x) {}
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40 constexpr ~W1 () { if (w == 5) asm (""); w = 3; } // { dg-error "inline assembly is not a constant expression" }
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41 // { dg-message "only unevaluated inline assembly is allowed in a 'constexpr' function" "" { target *-*-* } .-1 }
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42 int w;
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43 };
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44 struct W2
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45 {
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46 constexpr W2 () : w (0) {}
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47 constexpr W2 (int x) : w (x) {}
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48 constexpr ~W2 () { if (w == 5) asm (""); w = 3; } // { dg-error "inline assembly is not a constant expression" }
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49 // { dg-message "only unevaluated inline assembly is allowed in a 'constexpr' function" "" { target *-*-* } .-1 }
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50 int w;
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51 };
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52 struct W3
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53 {
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54 constexpr W3 () : w (0) {}
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55 constexpr W3 (int x) : w (x) {}
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56 constexpr ~W3 () { if (w == 5) asm (""); w = 3; } // { dg-error "inline assembly is not a constant expression" }
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57 // { dg-message "only unevaluated inline assembly is allowed in a 'constexpr' function" "" { target *-*-* } .-1 }
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58 int w;
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59 };
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60 struct W4
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61 {
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62 constexpr W4 () : w (0) {}
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63 constexpr W4 (int x) : w (x) {}
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64 constexpr ~W4 () { if (w == 5) asm (""); w = 3; } // { dg-error "inline assembly is not a constant expression" }
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65 // { dg-message "only unevaluated inline assembly is allowed in a 'constexpr' function" "" { target *-*-* } .-1 }
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66 int w;
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67 };
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68 struct W5
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69 {
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70 constexpr W5 () : w (0) {}
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71 constexpr W5 (int x) : w (x) {}
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72 constexpr ~W5 () { if (w == 5) asm (""); w = 3; } // { dg-error "inline assembly is not a constant expression" }
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73 // { dg-message "only unevaluated inline assembly is allowed in a 'constexpr' function" "" { target *-*-* } .-1 }
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74 int w;
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75 };
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76 struct W6
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77 {
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78 constexpr W6 () : w (0) {}
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79 constexpr W6 (int x) : w (x) {}
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80 constexpr ~W6 () { if (w == 5) asm (""); w = 3; } // { dg-error "inline assembly is not a constant expression" }
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81 // { dg-message "only unevaluated inline assembly is allowed in a 'constexpr' function" "" { target *-*-* } .-1 }
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82 int w;
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83 };
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84 struct W7
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85 {
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86 constexpr W7 () : w (0) {}
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87 constexpr W7 (int x) : w (x) {}
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88 constexpr ~W7 () { if (w == 5) asm (""); w = 3; } // { dg-error "inline assembly is not a constant expression" }
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89 // { dg-message "only unevaluated inline assembly is allowed in a 'constexpr' function" "" { target *-*-* } .-1 }
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90 int w;
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91 };
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92 struct W8
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93 {
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94 constexpr W8 () : w (0) {}
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95 constexpr W8 (int x) : w (x) {}
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96 constexpr ~W8 () { if (w == 5) asm (""); w = 3; } // { dg-error "inline assembly is not a constant expression" }
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97 // { dg-message "only unevaluated inline assembly is allowed in a 'constexpr' function" "" { target *-*-* } .-1 }
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98 int w;
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99 };
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100 struct X : public T
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101 {
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102 constexpr X () : x (0) {}
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103 constexpr ~X () = default; // { dg-error "explicitly defaulted function 'constexpr X::~X\\(\\)' cannot be declared 'constexpr' because the implicit declaration is not 'constexpr'" }
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104 int x;
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105 };
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106 constexpr S s;
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107 constexpr T t; // { dg-error "the type 'const T' of 'constexpr' variable 't' is not literal" }
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108 constexpr W0 w1;
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109 constexpr W0 w2 = 12;
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110 constexpr W1 w3 = 5; // { dg-message "in 'constexpr' expansion of" }
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111 constexpr W0 w4[3] = { 1, 2, 3 };
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112 constexpr W2 w5[3] = { 4, 5, 6 }; // { dg-message "in 'constexpr' expansion of" }
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113
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114 void
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115 f1 ()
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116 {
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117 constexpr S s2;
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118 constexpr W0 w6;
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119 constexpr W0 w7 = 12;
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120 constexpr W3 w8 = 5; // { dg-message "in 'constexpr' expansion of" }
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121 constexpr W0 w9[3] = { 1, 2, 3 };
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122 constexpr W4 w10[3] = { 4, 5, 6 }; // { dg-message "in 'constexpr' expansion of" }
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123 }
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124
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125 constexpr int
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126 f2 ()
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127 {
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128 constexpr S s3;
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129 constexpr W0 w11;
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130 constexpr W0 w12 = 12;
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131 constexpr W5 w13 = 5; // { dg-message "in 'constexpr' expansion of" }
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132 constexpr W0 w14[3] = { 1, 2, 3 };
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133 constexpr W6 w15[3] = { 4, 5, 6 }; // { dg-message "in 'constexpr' expansion of" }
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134 return 0;
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135 }
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136
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137 constexpr int
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138 f3 ()
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139 {
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140 S s3;
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141 W0 w11;
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142 W0 w12 = 12;
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143 W0 w14[3] = { 1, 2, 3 };
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144 return 0;
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145 }
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146
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147 constexpr int x3 = f3 ();
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148
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149 constexpr int
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150 f4 ()
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151 {
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152 W7 w13 = 5; // { dg-message "in 'constexpr' expansion of" }
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153 return 0;
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154 }
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155
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156 constexpr int x4 = f4 (); // { dg-message "in 'constexpr' expansion of" }
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157
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158 constexpr int
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159 f5 ()
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160 {
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161 W8 w15[3] = { 4, 5, 6 }; // { dg-message "in 'constexpr' expansion of" }
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162 return 0;
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163 }
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164
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165 constexpr int x5 = f5 (); // { dg-message "in 'constexpr' expansion of" }
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166
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167 void
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168 f6 ()
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169 {
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170 constexpr T t2; // { dg-error "the type 'const T' of 'constexpr' variable 't2' is not literal" }
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171 }
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172
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173 constexpr int
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174 f7 ()
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175 {
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176 constexpr T t3; // { dg-error "the type 'const T' of 'constexpr' variable 't3' is not literal" }
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177 return 0;
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178 }
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179
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180 constexpr int
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181 f8 ()
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182 {
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183 T t4; // { dg-error "variable 't4' of non-literal type 'T' in 'constexpr' function" }
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184 return 0;
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185 }
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