1 //===----------------------------------------------------------------------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is dual licensed under the MIT and the University of Illinois Open
6 // Source Licenses. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 
10 // UNSUPPORTED: c++98, c++03, c++11, c++14
11 
12 // <iterator>
13 // template <class C> constexpr auto data(C& c) -> decltype(c.data());               // C++17
14 // template <class C> constexpr auto data(const C& c) -> decltype(c.data());         // C++17
15 // template <class T, size_t N> constexpr T* data(T (&array)[N]) noexcept;           // C++17
16 // template <class E> constexpr const E* data(initializer_list<E> il) noexcept;      // C++17
17 
18 #include <iterator>
19 #include <cassert>
20 #include <vector>
21 #include <array>
22 #include <initializer_list>
23 
24 #include "test_macros.h"
25 
26 #if TEST_STD_VER > 14
27 #include <string_view>
28 #endif
29 
30 template<typename C>
test_const_container(const C & c)31 void test_const_container( const C& c )
32 {
33 //  Can't say noexcept here because the container might not be
34     assert ( std::data(c)   == c.data());
35 }
36 
37 template<typename T>
test_const_container(const std::initializer_list<T> & c)38 void test_const_container( const std::initializer_list<T>& c )
39 {
40     ASSERT_NOEXCEPT(std::data(c));
41     assert ( std::data(c)   == c.begin());
42 }
43 
44 template<typename C>
test_container(C & c)45 void test_container( C& c )
46 {
47 //  Can't say noexcept here because the container might not be
48     assert ( std::data(c)   == c.data());
49 }
50 
51 template<typename T>
test_container(std::initializer_list<T> & c)52 void test_container( std::initializer_list<T>& c)
53 {
54     ASSERT_NOEXCEPT(std::data(c));
55     assert ( std::data(c)   == c.begin());
56 }
57 
58 template<typename T, size_t Sz>
test_const_array(const T (& array)[Sz])59 void test_const_array( const T (&array)[Sz] )
60 {
61     ASSERT_NOEXCEPT(std::data(array));
62     assert ( std::data(array) == &array[0]);
63 }
64 
main()65 int main()
66 {
67     std::vector<int> v; v.push_back(1);
68     std::array<int, 1> a; a[0] = 3;
69     std::initializer_list<int> il = { 4 };
70 
71     test_container ( v );
72     test_container ( a );
73     test_container ( il );
74 
75     test_const_container ( v );
76     test_const_container ( a );
77     test_const_container ( il );
78 
79 #if TEST_STD_VER > 14
80     std::string_view sv{"ABC"};
81     test_container ( sv );
82     test_const_container ( sv );
83 #endif
84 
85     static constexpr int arrA [] { 1, 2, 3 };
86     test_const_array ( arrA );
87 }
88