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
20 #include "test_macros.h"
21
22 #include "suppress_array_warnings.h"
23
main()24 int main()
25 {
26 {
27 typedef double T;
28 typedef std::array<T, 3> C;
29 C c = {1, 2, 3.5};
30 C::reference r1 = c[0];
31 assert(r1 == 1);
32 r1 = 5.5;
33 assert(c.front() == 5.5);
34
35 C::reference r2 = c[2];
36 assert(r2 == 3.5);
37 r2 = 7.5;
38 assert(c.back() == 7.5);
39 }
40 {
41 typedef double T;
42 typedef std::array<T, 3> C;
43 const C c = {1, 2, 3.5};
44 C::const_reference r1 = c[0];
45 assert(r1 == 1);
46 C::const_reference r2 = c[2];
47 assert(r2 == 3.5);
48 }
49
50 #if TEST_STD_VER > 11
51 {
52 typedef double T;
53 typedef std::array<T, 3> C;
54 constexpr C c = {1, 2, 3.5};
55
56 constexpr T t1 = c[0];
57 static_assert (t1 == 1, "");
58
59 constexpr T t2 = c[2];
60 static_assert (t2 == 3.5, "");
61 }
62 #endif
63
64 }
65