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 size(const C& c) -> decltype(c.size());         // C++17
12 // template <class T, size_t N> constexpr size_t size(const T (&array)[N]) noexcept; // C++17
13 
14 #if __cplusplus <= 201402L
main()15 int main () {}
16 #else
17 
18 #include <iterator>
19 #include <cassert>
20 #include <vector>
21 #include <array>
22 #include <list>
23 #include <initializer_list>
24 
25 template<typename C>
test_const_container(const C & c)26 void test_const_container( const C& c )
27 {
28     assert ( std::size(c)   == c.size());
29 }
30 
31 template<typename T>
test_const_container(const std::initializer_list<T> & c)32 void test_const_container( const std::initializer_list<T>& c)
33 {
34     assert ( std::size(c)   == c.size());
35 }
36 
37 template<typename C>
test_container(C & c)38 void test_container( C& c)
39 {
40     assert ( std::size(c)   == c.size());
41 }
42 
43 template<typename T>
test_container(std::initializer_list<T> & c)44 void test_container( std::initializer_list<T>& c )
45 {
46     assert ( std::size(c)   == c.size());
47 }
48 
49 template<typename T, size_t Sz>
test_const_array(const T (& array)[Sz])50 void test_const_array( const T (&array)[Sz] )
51 {
52     assert ( std::size(array) == Sz );
53 }
54 
main()55 int main()
56 {
57     std::vector<int> v; v.push_back(1);
58     std::list<int>   l; l.push_back(2);
59     std::array<int, 1> a; a[0] = 3;
60     std::initializer_list<int> il = { 4 };
61 
62     test_container ( v );
63     test_container ( l );
64     test_container ( a );
65     test_container ( il );
66 
67     test_const_container ( v );
68     test_const_container ( l );
69     test_const_container ( a );
70     test_const_container ( il );
71 
72     static constexpr int arrA [] { 1, 2, 3 };
73     test_const_array ( arrA );
74 }
75 
76 #endif
77