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>
test(const CharT * s,size_t len)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 }
31
32 sv1.remove_suffix ( len - 1 );
33 assert ( sv1.size() == 0 );
34
35 SV sv2 ( s );
36 sv2.remove_suffix ( len << 1 );
37 assert ( sv1.size() == 0 );
38 }
39
40 }
41
42 #if _LIBCPP_STD_VER > 11
test_ce(size_t n,size_t k)43 constexpr size_t test_ce ( size_t n, size_t k ) {
44 typedef std::experimental::basic_string_view<char> SV;
45 SV sv1{ "ABCDEFGHIJKL", n };
46 sv1.remove_suffix ( k );
47 return sv1.size();
48 }
49 #endif
50
main()51 int main () {
52 test ( "ABCDE", 5 );
53 test ( "a", 1 );
54 test ( "", 0 );
55
56 test ( L"ABCDE", 5 );
57 test ( L"a", 1 );
58 test ( L"", 0 );
59
60 #if __cplusplus >= 201103L
61 test ( u"ABCDE", 5 );
62 test ( u"a", 1 );
63 test ( u"", 0 );
64
65 test ( U"ABCDE", 5 );
66 test ( U"a", 1 );
67 test ( U"", 0 );
68 #endif
69
70 #if _LIBCPP_STD_VER > 11
71 {
72 static_assert ( test_ce ( 5, 0 ) == 5, "" );
73 static_assert ( test_ce ( 5, 1 ) == 4, "" );
74 static_assert ( test_ce ( 5, 5 ) == 0, "" );
75 static_assert ( test_ce ( 5, 9 ) == 0, "" );
76 static_assert ( test_ce ( 9, 3 ) == 6, "" );
77 }
78 #endif
79 }
80