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
11 // <string_view>
12
13 // void clear() noexcept
14
15 #include <string_view>
16 #include <cassert>
17
18 #include "test_macros.h"
19
20 template<typename CharT>
test(const CharT * s,size_t len)21 void test ( const CharT *s, size_t len ) {
22 typedef std::basic_string_view<CharT> SV;
23 {
24 SV sv1 ( s );
25 assert ( sv1.size() == len );
26 assert ( sv1.data() == s );
27
28 sv1.clear ();
29 assert ( sv1.data() == nullptr );
30 assert ( sv1.size() == 0 );
31 assert ( sv1 == SV());
32 }
33 }
34
35 #if TEST_STD_VER > 11
test_ce(size_t n)36 constexpr size_t test_ce ( size_t n ) {
37 typedef std::basic_string_view<char> SV;
38 SV sv1{ "ABCDEFGHIJKL", n };
39 sv1.clear();
40 return sv1.size();
41 }
42 #endif
43
main()44 int main () {
45 test ( "ABCDE", 5 );
46 test ( "a", 1 );
47 test ( "", 0 );
48
49 test ( L"ABCDE", 5 );
50 test ( L"a", 1 );
51 test ( L"", 0 );
52
53 #if TEST_STD_VER >= 11
54 test ( u"ABCDE", 5 );
55 test ( u"a", 1 );
56 test ( u"", 0 );
57
58 test ( U"ABCDE", 5 );
59 test ( U"a", 1 );
60 test ( U"", 0 );
61 #endif
62
63 #if TEST_STD_VER > 11
64 static_assert ( test_ce (5) == 0, "" );
65 #endif
66
67 }
68