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 // UNSUPPORTED: c++98, c++03, c++11, c++14 11 12 // <iterator> 13 // template <class C> constexpr auto data(C& c) -> decltype(c.data()); // C++17 14 // template <class C> constexpr auto data(const C& c) -> decltype(c.data()); // C++17 15 // template <class T, size_t N> constexpr T* data(T (&array)[N]) noexcept; // C++17 16 // template <class E> constexpr const E* data(initializer_list<E> il) noexcept; // C++17 17 18 #include <iterator> 19 #include <cassert> 20 #include <vector> 21 #include <array> 22 #include <initializer_list> 23 24 #include "test_macros.h" 25 26 template<typename C> 27 void test_const_container( const C& c ) 28 { 29 // Can't say noexcept here because the container might not be 30 assert ( std::data(c) == c.data()); 31 } 32 33 template<typename T> 34 void test_const_container( const std::initializer_list<T>& c ) 35 { 36 ASSERT_NOEXCEPT(std::data(c)); 37 assert ( std::data(c) == c.begin()); 38 } 39 40 template<typename C> 41 void test_container( C& c ) 42 { 43 // Can't say noexcept here because the container might not be 44 assert ( std::data(c) == c.data()); 45 } 46 47 template<typename T> 48 void test_container( std::initializer_list<T>& c) 49 { 50 ASSERT_NOEXCEPT(std::data(c)); 51 assert ( std::data(c) == c.begin()); 52 } 53 54 template<typename T, size_t Sz> 55 void test_const_array( const T (&array)[Sz] ) 56 { 57 ASSERT_NOEXCEPT(std::data(array)); 58 assert ( std::data(array) == &array[0]); 59 } 60 61 int main() 62 { 63 std::vector<int> v; v.push_back(1); 64 std::array<int, 1> a; a[0] = 3; 65 std::initializer_list<int> il = { 4 }; 66 67 test_container ( v ); 68 test_container ( a ); 69 test_container ( il ); 70 71 test_const_container ( v ); 72 test_const_container ( a ); 73 test_const_container ( il ); 74 75 static constexpr int arrA [] { 1, 2, 3 }; 76 test_const_array ( arrA ); 77 } 78