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 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
