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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 // constexpr basic_string_view substr(size_type pos = 0, size_type n = npos) const;
14 
15 // Throws: out_of_range if pos > size().
16 // Effects: Determines the effective length rlen of the string to reference as the smaller of n and size() - pos.
17 // Returns: basic_string_view(data()+pos, rlen).
18 
19 #include <experimental/string_view>
20 #include <cassert>
21 
22 template<typename CharT>
test1(std::experimental::basic_string_view<CharT> sv,size_t n,size_t pos)23 void test1 ( std::experimental::basic_string_view<CharT> sv, size_t n, size_t pos ) {
24     try {
25         std::experimental::basic_string_view<CharT> sv1 = sv.substr(pos, n);
26         const size_t rlen = std::min ( n, sv.size() - pos );
27         assert ( sv1.size() == rlen );
28         for ( size_t i = 0; i <= rlen; ++i )
29             assert ( sv[pos+i] == sv1[i] );
30         }
31     catch ( const std::out_of_range & ) { assert ( pos > sv.size()); }
32 }
33 
34 
35 template<typename CharT>
test(const CharT * s)36 void test ( const CharT *s ) {
37     typedef std::experimental::basic_string_view<CharT> string_view_t;
38 
39     string_view_t sv1 ( s );
40 
41     test1(sv1,  0, 0);
42     test1(sv1,  1, 0);
43     test1(sv1, 20, 0);
44     test1(sv1, sv1.size(), 0);
45 
46     test1(sv1,   0, 3);
47     test1(sv1,   2, 3);
48     test1(sv1, 100, 3);
49 
50     test1(sv1, 0, string_view_t::npos);
51     test1(sv1, 2, string_view_t::npos);
52     test1(sv1, sv1.size(), string_view_t::npos);
53 
54     test1(sv1, sv1.size() + 1, 0);
55     test1(sv1, sv1.size() + 1, 1);
56     test1(sv1, sv1.size() + 1, string_view_t::npos);
57 }
58 
main()59 int main () {
60     test ( "ABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDE" );
61     test ( "ABCDE");
62     test ( "a" );
63     test ( "" );
64 
65     test ( L"ABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDE" );
66     test ( L"ABCDE" );
67     test ( L"a" );
68     test ( L"" );
69 
70 #if __cplusplus >= 201103L
71     test ( u"ABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDE" );
72     test ( u"ABCDE" );
73     test ( u"a" );
74     test ( u"" );
75 
76     test ( U"ABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDE" );
77     test ( U"ABCDE" );
78     test ( U"a" );
79     test ( U"" );
80 #endif
81 
82 #if _LIBCPP_STD_VER > 11
83     {
84     constexpr std::experimental::string_view sv1 { "ABCDE", 5 };
85 
86     {
87     constexpr std::experimental::string_view sv2 = sv1.substr ( 0, 3 );
88     static_assert ( sv2.size() == 3, "" );
89     static_assert ( sv2[0] == 'A', "" );
90     static_assert ( sv2[1] == 'B', "" );
91     static_assert ( sv2[2] == 'C', "" );
92     }
93 
94     {
95     constexpr std::experimental::string_view sv2 = sv1.substr ( 3, 0 );
96     static_assert ( sv2.size() == 0, "" );
97     }
98 
99     {
100     constexpr std::experimental::string_view sv2 = sv1.substr ( 3, 3 );
101     static_assert ( sv2.size() == 2, "" );
102     static_assert ( sv2[0] == 'D', "" );
103     static_assert ( sv2[1] == 'E', "" );
104     }
105     }
106 #endif
107 }
108