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comparison 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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131:84e7813d76e9 145:1830386684a0
1 // PR c++/88815
2 // { dg-do compile { target c++11 } }
3
4 struct true_type {
5 constexpr operator bool() const { return true; }
6 };
7
8 struct false_type {
9 constexpr operator bool() const { return false; }
10 };
11
12 template<int (*p)()>
13 true_type is_constexpr_impl(decltype(int{(p(), 0U)}));
14
15 template<int (*p)()>
16 false_type is_constexpr_impl(...);
17
18 template<int (*p)()>
19 using is_constexpr = decltype(is_constexpr_impl<p>(0));
20
21 constexpr int f() { return 0; }
22 int g() { return 0; }
23
24 static_assert(is_constexpr<f>(), "");
25 static_assert(!is_constexpr<g>(), "");