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 // std::array is explicitly allowed to be initialized with A a = { init-list };. 23 // Disable the missing braces warning for this reason. 24 #include "disable_missing_braces_warning.h" 25 26 int main() 27 { 28 { 29 typedef double T; 30 typedef std::array<T, 3> C; 31 C c = {1, 2, 3.5}; 32 C::reference r1 = c[0]; 33 assert(r1 == 1); 34 r1 = 5.5; 35 assert(c.front() == 5.5); 36 37 C::reference r2 = c[2]; 38 assert(r2 == 3.5); 39 r2 = 7.5; 40 assert(c.back() == 7.5); 41 } 42 { 43 typedef double T; 44 typedef std::array<T, 3> C; 45 const C c = {1, 2, 3.5}; 46 C::const_reference r1 = c[0]; 47 assert(r1 == 1); 48 C::const_reference r2 = c[2]; 49 assert(r2 == 3.5); 50 } 51 52 #if TEST_STD_VER > 11 53 { 54 typedef double T; 55 typedef std::array<T, 3> C; 56 constexpr C c = {1, 2, 3.5}; 57 58 constexpr T t1 = c[0]; 59 static_assert (t1 == 1, ""); 60 61 constexpr T t2 = c[2]; 62 static_assert (t2 == 3.5, ""); 63 } 64 #endif 65 66 } 67