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.at(0);
27 assert(r1 == 1);
28 r1 = 5.5;
29 assert(c.front() == 5.5);
30
31 C::reference r2 = c.at(2);
32 assert(r2 == 3.5);
33 r2 = 7.5;
34 assert(c.back() == 7.5);
35
36 try { (void) c.at(3); }
37 catch (const std::out_of_range &) {}
38 }
39 {
40 typedef double T;
41 typedef std::array<T, 3> C;
42 const C c = {1, 2, 3.5};
43 C::const_reference r1 = c.at(0);
44 assert(r1 == 1);
45
46 C::const_reference r2 = c.at(2);
47 assert(r2 == 3.5);
48
49 try { (void) c.at(3); }
50 catch (const std::out_of_range &) {}
51 }
52
53 #if _LIBCPP_STD_VER > 11
54 {
55 typedef double T;
56 typedef std::array<T, 3> C;
57 constexpr C c = {1, 2, 3.5};
58
59 constexpr T t1 = c.at(0);
60 static_assert (t1 == 1, "");
61
62 constexpr T t2 = c.at(2);
63 static_assert (t2 == 3.5, "");
64 }
65 #endif
66
67 }
68