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 
10 // <string_view>
11 
12 // void remove_suffix(size_type _n)
13 
14 #include <string_view>
15 #include <cassert>
16 
17 #include "test_macros.h"
18 
19 template<typename CharT>
20 void test ( const CharT *s, size_t len ) {
21     typedef std::basic_string_view<CharT> SV;
22     {
23     SV sv1 ( s );
24     assert ( sv1.size() == len );
25     assert ( sv1.data() == s );
26 
27     if ( len > 0 ) {
28         sv1.remove_suffix ( 1 );
29         assert ( sv1.size() == (len - 1));
30         assert ( sv1.data() == s);
31         sv1.remove_suffix ( len - 1 );
32         }
33 
34     assert ( sv1.size() == 0 );
35     sv1.remove_suffix ( 0 );
36     assert ( sv1.size() == 0 );
37     }
38 
39 }
40 
41 #if TEST_STD_VER > 11
42 constexpr size_t test_ce ( size_t n, size_t k ) {
43     typedef std::basic_string_view<char> SV;
44     SV sv1{ "ABCDEFGHIJKL", n };
45     sv1.remove_suffix ( k );
46     return sv1.size();
47 }
48 #endif
49 
50 int main(int, char**) {
51     test ( "ABCDE", 5 );
52     test ( "a", 1 );
53     test ( "", 0 );
54 
55     test ( L"ABCDE", 5 );
56     test ( L"a", 1 );
57     test ( L"", 0 );
58 
59 #if TEST_STD_VER >= 11
60     test ( u"ABCDE", 5 );
61     test ( u"a", 1 );
62     test ( u"", 0 );
63 
64     test ( U"ABCDE", 5 );
65     test ( U"a", 1 );
66     test ( U"", 0 );
67 #endif
68 
69 #if TEST_STD_VER > 11
70     {
71     static_assert ( test_ce ( 5, 0 ) == 5, "" );
72     static_assert ( test_ce ( 5, 1 ) == 4, "" );
73     static_assert ( test_ce ( 5, 5 ) == 0, "" );
74     static_assert ( test_ce ( 9, 3 ) == 6, "" );
75     }
76 #endif
77 
78   return 0;
79 }
80