xref: /llvm-project/libcxx/test/std/language.support/support.runtime/cstdlib.pass.cpp (revision 14324fa4285f5cd1e421a6cebdceb05d6c49a8dc)
1 //===----------------------------------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 // test <cstdlib>
10 
11 #include <cstdlib>
12 #include <type_traits>
13 #include <cassert>
14 
15 #include "test_macros.h"
16 
17 #ifndef EXIT_FAILURE
18 #error EXIT_FAILURE not defined
19 #endif
20 
21 #ifndef EXIT_SUCCESS
22 #error EXIT_SUCCESS not defined
23 #endif
24 
25 #ifndef MB_CUR_MAX
26 #error MB_CUR_MAX not defined
27 #endif
28 
29 #ifndef NULL
30 #error NULL not defined
31 #endif
32 
33 #ifndef RAND_MAX
34 #error RAND_MAX not defined
35 #endif
36 
37 template <class TestType, class IntType>
38 void test_div_struct() {
39     TestType obj;
40     static_assert(sizeof(obj) >= sizeof(IntType) * 2, ""); // >= to account for alignment.
41     static_assert((std::is_same<decltype(obj.quot), IntType>::value), "");
42     static_assert((std::is_same<decltype(obj.rem), IntType>::value), "");
43     ((void) obj);
44 };
45 
46 template <class T, class = decltype(std::abs(std::declval<T>()))>
47 std::true_type has_abs_imp(int);
48 template <class T>
49 std::false_type has_abs_imp(...);
50 
51 template <class T>
52 struct has_abs : decltype(has_abs_imp<T>(0)) {};
53 
54 void test_abs() {
55     TEST_DIAGNOSTIC_PUSH
56     TEST_CLANG_DIAGNOSTIC_IGNORED("-Wabsolute-value")
57     static_assert((std::is_same<decltype(std::abs((float)0)), float>::value), "");
58     static_assert((std::is_same<decltype(std::abs((double)0)), double>::value), "");
59     static_assert(
60         (std::is_same<decltype(std::abs((long double)0)), long double>::value), "");
61     static_assert((std::is_same<decltype(std::abs((int)0)), int>::value), "");
62     static_assert((std::is_same<decltype(std::abs((long)0)), long>::value), "");
63     static_assert((std::is_same<decltype(std::abs((long long)0)), long long>::value),
64                   "");
65     static_assert((std::is_same<decltype(std::abs((unsigned char)0)), int>::value),
66                   "");
67     static_assert((std::is_same<decltype(std::abs((unsigned short)0)), int>::value),
68                   "");
69     static_assert((std::is_same<decltype(std::abs((signed char)0)), int>::value),
70                   "");
71     static_assert((std::is_same<decltype(std::abs((short)0)), int>::value),
72                   "");
73     static_assert((std::is_same<decltype(std::abs((unsigned char)0)), int>::value),
74                   "");
75     static_assert((std::is_same<decltype(std::abs((char)0)), int>::value),
76                   "");
77 
78     static_assert(!has_abs<unsigned>::value, "");
79     static_assert(!has_abs<unsigned long>::value, "");
80     static_assert(!has_abs<unsigned long long>::value, "");
81     static_assert(!has_abs<size_t>::value, "");
82 
83     TEST_DIAGNOSTIC_POP
84 
85     assert(std::abs(-1.) == 1);
86 }
87 
88 int main(int, char**)
89 {
90     std::size_t s = 0;
91     ((void)s);
92     static_assert((std::is_same<std::size_t, decltype(sizeof(int))>::value), "");
93     test_div_struct<std::div_t, int>();
94     test_div_struct<std::ldiv_t, long>();
95     test_div_struct<std::lldiv_t, long long>();
96     char** endptr = 0;
97     static_assert((std::is_same<decltype(std::atof("")), double>::value), "");
98     static_assert((std::is_same<decltype(std::atoi("")), int>::value), "");
99     static_assert((std::is_same<decltype(std::atol("")), long>::value), "");
100     static_assert((std::is_same<decltype(std::atoll("")), long long>::value), "");
101     static_assert((std::is_same<decltype(std::getenv("")), char*>::value), "");
102     static_assert((std::is_same<decltype(std::strtod("", endptr)), double>::value), "");
103     static_assert((std::is_same<decltype(std::strtof("", endptr)), float>::value), "");
104     static_assert((std::is_same<decltype(std::strtold("", endptr)), long double>::value), "");
105     static_assert((std::is_same<decltype(std::strtol("", endptr,0)), long>::value), "");
106     static_assert((std::is_same<decltype(std::strtoll("", endptr,0)), long long>::value), "");
107     static_assert((std::is_same<decltype(std::strtoul("", endptr,0)), unsigned long>::value), "");
108     static_assert((std::is_same<decltype(std::strtoull("", endptr,0)), unsigned long long>::value), "");
109     static_assert((std::is_same<decltype(std::rand()), int>::value), "");
110     static_assert((std::is_same<decltype(std::srand(0)), void>::value), "");
111 
112     // std::aligned_alloc tested in cstdlib.aligned_alloc.compile.pass.cpp
113 
114     void* pv = 0;
115     void (*handler)() = 0;
116     int (*comp)(void const*, void const*) = 0;
117     static_assert((std::is_same<decltype(std::calloc(0,0)), void*>::value), "");
118     static_assert((std::is_same<decltype(std::free(0)), void>::value), "");
119     static_assert((std::is_same<decltype(std::malloc(0)), void*>::value), "");
120     static_assert((std::is_same<decltype(std::realloc(0,0)), void*>::value), "");
121     static_assert((std::is_same<decltype(std::abort()), void>::value), "");
122     static_assert((std::is_same<decltype(std::atexit(handler)), int>::value), "");
123     static_assert((std::is_same<decltype(std::exit(0)), void>::value), "");
124     static_assert((std::is_same<decltype(std::_Exit(0)), void>::value), "");
125     static_assert((std::is_same<decltype(std::getenv("")), char*>::value), "");
126     static_assert((std::is_same<decltype(std::system("")), int>::value), "");
127     static_assert((std::is_same<decltype(std::bsearch(pv,pv,0,0,comp)), void*>::value), "");
128     static_assert((std::is_same<decltype(std::qsort(pv,0,0,comp)), void>::value), "");
129     static_assert((std::is_same<decltype(std::abs(0)), int>::value), "");
130     static_assert((std::is_same<decltype(std::abs((long)0)), long>::value), "");
131     static_assert((std::is_same<decltype(std::abs((long long)0)), long long>::value), "");
132     static_assert((std::is_same<decltype(std::labs((long)0)), long>::value), "");
133     static_assert((std::is_same<decltype(std::llabs((long long)0)), long long>::value), "");
134     static_assert((std::is_same<decltype(std::div(0,0)), std::div_t>::value), "");
135     static_assert((std::is_same<decltype(std::div(0L,0L)), std::ldiv_t>::value), "");
136     static_assert((std::is_same<decltype(std::div(0LL,0LL)), std::lldiv_t>::value), "");
137     static_assert((std::is_same<decltype(std::ldiv(0L,0L)), std::ldiv_t>::value), "");
138     static_assert((std::is_same<decltype(std::lldiv(0LL,0LL)), std::lldiv_t>::value), "");
139 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
140     wchar_t* pw = 0;
141     const wchar_t* pwc = 0;
142     char* pc = 0;
143     static_assert((std::is_same<decltype(std::mblen("",0)), int>::value), "");
144     static_assert((std::is_same<decltype(std::mbtowc(pw,"",0)), int>::value), "");
145     static_assert((std::is_same<decltype(std::wctomb(pc,L' ')), int>::value), "");
146     static_assert((std::is_same<decltype(std::mbstowcs(pw,"",0)), std::size_t>::value), "");
147     static_assert((std::is_same<decltype(std::wcstombs(pc,pwc,0)), std::size_t>::value), "");
148 #endif
149 
150     test_abs();
151 
152     return 0;
153 }
154