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annotate gcc/testsuite/g++.dg/concepts/placeholder2.C @ 111:04ced10e8804

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gcc 7
author kono
date Fri, 27 Oct 2017 22:46:09 +0900
parents
children 84e7813d76e9
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111
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1 // { dg-options "-std=c++17 -fconcepts" }
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2
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3 // Check argument deduction constraints.
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4 // TODO: We shoul have more of these...
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5
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6 template<typename T>
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7 concept bool C1 = sizeof(T) == 0;
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8
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9 template<typename T, typename U>
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10 concept bool C2 = __is_same_as(T, U);
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11
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12
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13 template<typename T>
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14 concept bool D1()
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15 {
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16 return requires (T t) { { t } -> C1; };
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17 }
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18
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19 template<typename T>
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20 concept bool D2()
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21 {
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22 return requires (T t) { { t } -> C2<void>; };
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23 }
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24
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25 void f1(D1) { }
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26 void f2(D2) { }
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27
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28 int main()
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29 {
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30 f1(0); // { dg-error "cannot call" }
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31 f2(0); // { dg-error "cannot call" }
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32 }