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a5544970 | 1 | // Copyright (C) 2018-2019 Free Software Foundation, Inc. |
0d7924f2 JJ |
2 | // |
3 | // This file is part of the GNU ISO C++ Library. This library is free | |
4 | // software; you can redistribute it and/or modify it under the | |
5 | // terms of the GNU General Public License as published by the | |
6 | // Free Software Foundation; either version 3, or (at your option) | |
7 | // any later version. | |
8 | ||
9 | // This library is distributed in the hope that it will be useful, | |
10 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | // GNU General Public License for more details. | |
13 | ||
14 | // You should have received a copy of the GNU General Public License along | |
15 | // with this library; see the file COPYING3. If not see | |
16 | // <http://www.gnu.org/licenses/>. | |
17 | ||
18 | // { dg-options "-std=gnu++2a" } | |
19 | // { dg-do run { target c++2a } } | |
20 | ||
21 | #include <type_traits> | |
22 | #include <testsuite_hooks.h> | |
23 | ||
24 | template<int N> | |
25 | struct X { int v = N; }; | |
26 | X<std::is_constant_evaluated()> x; // type X<true> | |
27 | int y = 4; | |
28 | int a = std::is_constant_evaluated() ? y : 1; // initializes a to 1 | |
29 | int b = std::is_constant_evaluated() ? 2 : y; // initializes b to 2 | |
30 | int c = y + (std::is_constant_evaluated() ? 2 : y); // initializes c to 2*y | |
31 | int d = std::is_constant_evaluated(); // initializes d to 1 | |
32 | int e = d + std::is_constant_evaluated(); // initializes e to 1 + 0 | |
33 | ||
34 | constexpr int | |
35 | foo(int x) | |
36 | { | |
37 | const int n = std::is_constant_evaluated() ? 13 : 17; // n == 13 | |
38 | int m = std::is_constant_evaluated() ? 13 : 17; // m might be 13 or 17 (see below) | |
39 | char arr[n] = {}; // char[13] | |
40 | return m + sizeof (arr) + x; | |
41 | } | |
42 | ||
43 | constexpr int | |
44 | bar() | |
45 | { | |
46 | const int n = std::is_constant_evaluated() ? 13 : 17; | |
47 | X<n> x1; | |
48 | X<std::is_constant_evaluated() ? 13 : 17> x2; | |
49 | static_assert(std::is_same<decltype(x1), decltype(x2)>::value, | |
50 | "x1/x2's type"); | |
51 | return x1.v + x2.v; | |
52 | } | |
53 | ||
54 | int p = foo(0); // m == 13; initialized to 26 | |
55 | int q = p + foo(0); // m == 17 for this call; initialized to 56 | |
56 | static_assert(bar() == 26, "bar"); | |
57 | ||
58 | struct S { int a, b; }; | |
59 | ||
60 | S s = { std::is_constant_evaluated() ? 2 : 3, y }; | |
61 | S t = { std::is_constant_evaluated() ? 2 : 3, 4 }; | |
62 | ||
63 | static_assert(std::is_same<decltype(x), X<true> >::value, "x's type"); | |
64 | ||
65 | void | |
66 | test01() | |
67 | { | |
68 | VERIFY( a == 1 && b == 2 && c == 8 && d == 1 && e == 1 && p == 26 ); | |
69 | VERIFY( q == 56 && s.a == 3 && s.b == 4 && t.a == 2 && t.b == 4 ); | |
70 | VERIFY( foo (y) == 34 ); | |
71 | if constexpr (foo (0) != 26) | |
72 | VERIFY( 0 ); | |
73 | constexpr int w = foo (0); | |
74 | VERIFY( w == 26 ); | |
75 | } | |
76 | ||
77 | int main() | |
78 | { | |
79 | test01(); | |
80 | } |