1 //===----------------------------------------------------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 // UNSUPPORTED: c++03, c++11, c++14 10 11 // <iterator> 12 // template <class C> constexpr auto data(C& c) -> decltype(c.data()); // C++17 13 // template <class C> constexpr auto data(const C& c) -> decltype(c.data()); // C++17 14 // template <class T, size_t N> constexpr T* data(T (&array)[N]) noexcept; // C++17 15 // template <class E> constexpr const E* data(initializer_list<E> il) noexcept; // C++17 16 17 #include <iterator> 18 #include <cassert> 19 #include <vector> 20 #include <array> 21 #include <initializer_list> 22 23 #include "test_macros.h" 24 25 #if TEST_STD_VER > 14 26 #include <string_view> 27 #endif 28 29 template<typename C> 30 void test_const_container( const C& c ) 31 { 32 // Can't say noexcept here because the container might not be 33 assert ( std::data(c) == c.data()); 34 } 35 36 template<typename T> 37 void test_const_container( const std::initializer_list<T>& c ) 38 { 39 ASSERT_NOEXCEPT(std::data(c)); 40 assert ( std::data(c) == c.begin()); 41 } 42 43 template<typename C> 44 void test_container( C& c ) 45 { 46 // Can't say noexcept here because the container might not be 47 assert ( std::data(c) == c.data()); 48 } 49 50 template<typename T> 51 void test_container( std::initializer_list<T>& c) 52 { 53 ASSERT_NOEXCEPT(std::data(c)); 54 assert ( std::data(c) == c.begin()); 55 } 56 57 template<typename T, size_t Sz> 58 void test_const_array( const T (&array)[Sz] ) 59 { 60 ASSERT_NOEXCEPT(std::data(array)); 61 assert ( std::data(array) == &array[0]); 62 } 63 64 int main(int, char**) 65 { 66 std::vector<int> v; v.push_back(1); 67 std::array<int, 1> a; a[0] = 3; 68 std::initializer_list<int> il = { 4 }; 69 70 test_container ( v ); 71 test_container ( a ); 72 test_container ( il ); 73 74 test_const_container ( v ); 75 test_const_container ( a ); 76 test_const_container ( il ); 77 78 #if TEST_STD_VER > 14 79 std::string_view sv{"ABC"}; 80 test_container ( sv ); 81 test_const_container ( sv ); 82 #endif 83 84 static constexpr int arrA [] { 1, 2, 3 }; 85 test_const_array ( arrA ); 86 87 return 0; 88 } 89