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7adcbafe | 1 | // Copyright (C) 2020-2022 Free Software Foundation, Inc. |
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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 | ||
aa89c53c | 18 | // expensive: * [1-9] * * |
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19 | #include "bits/verify.h" |
20 | #include "bits/metahelpers.h" | |
21 | ||
22 | template <class V> | |
23 | struct call_generator | |
24 | { | |
25 | template <class F> | |
26 | auto | |
27 | operator()(const F& f) -> decltype(V(f)); | |
28 | }; | |
29 | ||
30 | using schar = signed char; | |
31 | using uchar = unsigned char; | |
32 | using ullong = unsigned long long; | |
33 | ||
34 | template <typename V> | |
35 | void | |
36 | test() | |
37 | { | |
38 | using T = typename V::value_type; | |
39 | V x([](int) { return T(1); }); | |
40 | COMPARE(x, V(1)); | |
41 | // unconditionally returns int from generator lambda | |
42 | x = V([](int) { return 1; }); | |
43 | COMPARE(x, V(1)); | |
44 | x = V([](auto i) { return T(i); }); | |
45 | COMPARE(x, V([](T i) { return i; })); | |
46 | ||
47 | VERIFY((// that int always works | |
48 | sfinae_is_callable<int (&)(int)>(call_generator<V>()))); | |
49 | COMPARE(sfinae_is_callable<schar (&)(int)>(call_generator<V>()), | |
50 | std::is_signed<T>::value); | |
51 | COMPARE(sfinae_is_callable<uchar (&)(int)>(call_generator<V>()), | |
52 | !(std::is_signed_v<T> && sizeof(T) <= sizeof(uchar))); | |
53 | COMPARE(sfinae_is_callable<float (&)(int)>(call_generator<V>()), | |
54 | (std::is_floating_point<T>::value)); | |
55 | ||
56 | COMPARE(sfinae_is_callable<ullong (&)(int)>(call_generator<V>()), | |
57 | std::__finite_max_v<T> >= std::__finite_max_v<ullong> | |
58 | && std::__digits_v<T> >= std::__digits_v<ullong>); | |
59 | } |