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152
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1 // PR c++/90938 - Initializing array with {1} works, but not {0}
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2 // { dg-do compile { target c++20 } }
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3 // { dg-options "-Wall" }
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4
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5 struct A { int i; };
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6 struct B { A a[2]; };
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7
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8 static const constexpr A a0 = { 0 };
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9 static const constexpr A a_ = { };
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10
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11 template <B> struct X { };
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12
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13 typedef X<B{ }> XB;
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14 typedef X<B{{A{ }}}> XB;
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15 typedef X<B{{A{ 0 }}}> XB;
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16 typedef X<B{{a_}}> XB;
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17 typedef X<B{{a0}}> XB;
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18 typedef X<B{{a_, A{ }}}> XB;
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19 typedef X<B{{a_, A{ 0 }}}> XB;
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20 typedef X<B{{a_, a_}}> XB;
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21 typedef X<B{{a_, a0}}> XB;
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22
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23
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24 struct C { constexpr C () = default; };
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25 struct D { C c[2]; };
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26
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27 static const constexpr C c_ = { };
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28
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29 template <D> struct Y { };
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30
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31 typedef Y<D{ }> YD;
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32 typedef Y<D{C { }}> YD;
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33 typedef Y<D{{c_}}> YD;
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34 typedef Y<D{C{ }, C{ }}> YD;
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35 typedef Y<D{C{ }, c_}> YD;
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36 typedef Y<D{{c_, c_}}> YD;
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