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annotate gcc/testsuite/g++.dg/cpp0x/constexpr-decltype3.C @ 145:1830386684a0

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gcc-9.2.0
author anatofuz
date Thu, 13 Feb 2020 11:34:05 +0900
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145
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1 // PR c++/88815
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2 // { dg-do compile { target c++11 } }
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3
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4 struct true_type {
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5 constexpr operator bool() const { return true; }
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6 };
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7
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8 struct false_type {
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9 constexpr operator bool() const { return false; }
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10 };
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11
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12 template<int (*p)()>
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13 true_type is_constexpr_impl(decltype(int{(p(), 0U)}));
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14
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15 template<int (*p)()>
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16 false_type is_constexpr_impl(...);
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17
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18 template<int (*p)()>
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19 using is_constexpr = decltype(is_constexpr_impl<p>(0));
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20
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21 constexpr int f() { return 0; }
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22 int g() { return 0; }
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23
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24 static_assert(is_constexpr<f>(), "");
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25 static_assert(!is_constexpr<g>(), "");