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 // UNSUPPORTED: c++03, c++11, c++14
10 
11 // <iterator>
12 // template <class C> constexpr auto data(C& c) -> decltype(c.data());               // C++17
13 // template <class C> constexpr auto data(const C& c) -> decltype(c.data());         // C++17
14 // template <class T, size_t N> constexpr T* data(T (&array)[N]) noexcept;           // C++17
15 // template <class E> constexpr const E* data(initializer_list<E> il) noexcept;      // C++17
16 
17 #include <iterator>
18 #include <cassert>
19 #include <vector>
20 #include <array>
21 #include <initializer_list>
22 
23 #include "test_macros.h"
24 
25 #if TEST_STD_VER > 14
26 #include <string_view>
27 #endif
28 
29 template<typename C>
test_const_container(const C & c)30 void test_const_container( const C& c )
31 {
32 //  Can't say noexcept here because the container might not be
33     assert ( std::data(c)   == c.data());
34 }
35 
36 template<typename T>
test_const_container(const std::initializer_list<T> & c)37 void test_const_container( const std::initializer_list<T>& c )
38 {
39     ASSERT_NOEXCEPT(std::data(c));
40     assert ( std::data(c)   == c.begin());
41 }
42 
43 template<typename C>
test_container(C & c)44 void test_container( C& c )
45 {
46 //  Can't say noexcept here because the container might not be
47     assert ( std::data(c)   == c.data());
48 }
49 
50 template<typename T>
test_container(std::initializer_list<T> & c)51 void test_container( std::initializer_list<T>& c)
52 {
53     ASSERT_NOEXCEPT(std::data(c));
54     assert ( std::data(c)   == c.begin());
55 }
56 
57 template<typename T, size_t Sz>
test_const_array(const T (& array)[Sz])58 void test_const_array( const T (&array)[Sz] )
59 {
60     ASSERT_NOEXCEPT(std::data(array));
61     assert ( std::data(array) == &array[0]);
62 }
63 
main(int,char **)64 int main(int, char**)
65 {
66     std::vector<int> v; v.push_back(1);
67     std::array<int, 1> a; a[0] = 3;
68     std::initializer_list<int> il = { 4 };
69 
70     test_container ( v );
71     test_container ( a );
72     test_container ( il );
73 
74     test_const_container ( v );
75     test_const_container ( a );
76     test_const_container ( il );
77 
78 #if TEST_STD_VER > 14
79     std::string_view sv{"ABC"};
80     test_container ( sv );
81     test_const_container ( sv );
82 #endif
83 
84     static constexpr int arrA [] { 1, 2, 3 };
85     test_const_array ( arrA );
86 
87   return 0;
88 }
89