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 remove_suffix(size_type _n)
14 
15 #include <experimental/string_view>
16 #include <cassert>
17 
18 template<typename CharT>
19 void test ( const CharT *s, size_t len ) {
20     typedef std::experimental::basic_string_view<CharT> SV;
21     {
22     SV sv1 ( s );
23     assert ( sv1.size() == len );
24     assert ( sv1.data() == s );
25 
26     if ( len > 0 ) {
27         sv1.remove_suffix ( 1 );
28         assert ( sv1.size() == (len - 1));
29         assert ( sv1.data() == s);
30         sv1.remove_suffix ( len - 1 );
31         }
32 
33     assert ( sv1.size() == 0 );
34     sv1.remove_suffix ( 0 );
35     assert ( sv1.size() == 0 );
36     }
37 
38 }
39 
40 #if _LIBCPP_STD_VER > 11
41 constexpr size_t test_ce ( size_t n, size_t k ) {
42     typedef std::experimental::basic_string_view<char> SV;
43     SV sv1{ "ABCDEFGHIJKL", n };
44     sv1.remove_suffix ( k );
45     return sv1.size();
46 }
47 #endif
48 
49 int main () {
50     test ( "ABCDE", 5 );
51     test ( "a", 1 );
52     test ( "", 0 );
53 
54     test ( L"ABCDE", 5 );
55     test ( L"a", 1 );
56     test ( L"", 0 );
57 
58 #if __cplusplus >= 201103L
59     test ( u"ABCDE", 5 );
60     test ( u"a", 1 );
61     test ( u"", 0 );
62 
63     test ( U"ABCDE", 5 );
64     test ( U"a", 1 );
65     test ( U"", 0 );
66 #endif
67 
68 #if _LIBCPP_STD_VER > 11
69     {
70     static_assert ( test_ce ( 5, 0 ) == 5, "" );
71     static_assert ( test_ce ( 5, 1 ) == 4, "" );
72     static_assert ( test_ce ( 5, 5 ) == 0, "" );
73     static_assert ( test_ce ( 9, 3 ) == 6, "" );
74     }
75 #endif
76 }
77