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 // <iterator> 11 // template <class C> constexpr auto data(C& c) -> decltype(c.data()); // C++17 12 // template <class C> constexpr auto data(const C& c) -> decltype(c.data()); // C++17 13 // template <class T, size_t N> constexpr T* data(T (&array)[N]) noexcept; // C++17 14 // template <class E> constexpr const E* data(initializer_list<E> il) noexcept; // C++17 15 16 #if __cplusplus <= 201402L 17 int main () {} 18 #else 19 20 #include <iterator> 21 #include <cassert> 22 #include <vector> 23 #include <array> 24 #include <initializer_list> 25 26 template<typename C> 27 void test_const_container( const C& c ) 28 { 29 assert ( std::data(c) == c.data()); 30 } 31 32 template<typename T> 33 void test_const_container( const std::initializer_list<T>& c ) 34 { 35 assert ( std::data(c) == c.begin()); 36 } 37 38 template<typename C> 39 void test_container( C& c ) 40 { 41 assert ( std::data(c) == c.data()); 42 } 43 44 template<typename T> 45 void test_container( std::initializer_list<T>& c) 46 { 47 assert ( std::data(c) == c.begin()); 48 } 49 50 template<typename T, size_t Sz> 51 void test_const_array( const T (&array)[Sz] ) 52 { 53 assert ( std::data(array) == &array[0]); 54 } 55 56 int main() 57 { 58 std::vector<int> v; v.push_back(1); 59 std::array<int, 1> a; a[0] = 3; 60 std::initializer_list<int> il = { 4 }; 61 62 test_container ( v ); 63 test_container ( a ); 64 test_container ( il ); 65 66 test_const_container ( v ); 67 test_const_container ( a ); 68 test_const_container ( il ); 69 70 static constexpr int arrA [] { 1, 2, 3 }; 71 test_const_array ( arrA ); 72 } 73 74 #endif 75
