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 // <array>
11
12 // reference operator[] (size_type)
13 // const_reference operator[] (size_type); // constexpr in C++14
14 // reference at (size_type)
15 // const_reference at (size_type); // constexpr in C++14
16
17 #include <array>
18 #include <cassert>
19
main()20 int main()
21 {
22 {
23 typedef double T;
24 typedef std::array<T, 3> C;
25 C c = {1, 2, 3.5};
26 C::reference r1 = c[0];
27 assert(r1 == 1);
28 r1 = 5.5;
29 assert(c.front() == 5.5);
30
31 C::reference r2 = c[2];
32 assert(r2 == 3.5);
33 r2 = 7.5;
34 assert(c.back() == 7.5);
35 }
36 {
37 typedef double T;
38 typedef std::array<T, 3> C;
39 const C c = {1, 2, 3.5};
40 C::const_reference r1 = c[0];
41 assert(r1 == 1);
42 C::const_reference r2 = c[2];
43 assert(r2 == 3.5);
44 }
45
46 #if _LIBCPP_STD_VER > 11
47 {
48 typedef double T;
49 typedef std::array<T, 3> C;
50 constexpr C c = {1, 2, 3.5};
51
52 constexpr T t1 = c[0];
53 static_assert (t1 == 1, "");
54
55 constexpr T t2 = c[2];
56 static_assert (t2 == 3.5, "");
57 }
58 #endif
59
60 }
61