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 // UNSUPPORTED: !stdlib=libc++ && (c++03 || c++11 || c++14)
10 
11 // <string_view>
12 
13 // size_type copy(charT* s, size_type n, size_type pos = 0) const;
14 
15 // Throws: out_of_range if pos > size().
16 // Remarks: Let rlen be the smaller of n and size() - pos.
17 // Requires: [s, s+rlen) is a valid range.
18 // Effects: Equivalent to std::copy_n(begin() + pos, rlen, s).
19 // Returns: rlen.
20 
21 #include <string_view>
22 #include <algorithm>
23 #include <cassert>
24 #include <stdexcept>
25 
26 #include "test_macros.h"
27 
28 template<typename CharT>
29 void test1 ( std::basic_string_view<CharT> sv, size_t n, size_t pos ) {
30     const size_t rlen = std::min ( n, sv.size() - pos );
31 
32     CharT *dest1 = new CharT [rlen + 1];    dest1[rlen] = 0;
33     CharT *dest2 = new CharT [rlen + 1];    dest2[rlen] = 0;
34 
35     if (pos > sv.size()) {
36 #ifndef TEST_HAS_NO_EXCEPTIONS
37         try {
38             sv.copy(dest1, n, pos);
39             assert(false);
40         } catch (const std::out_of_range&) {
41         } catch (...) {
42             assert(false);
43         }
44 #endif
45     } else {
46         sv.copy(dest1, n, pos);
47         std::copy_n(sv.begin() + pos, rlen, dest2);
48         for ( size_t i = 0; i <= rlen; ++i )
49             assert ( dest1[i] == dest2[i] );
50     }
51     delete [] dest1;
52     delete [] dest2;
53 }
54 
55 
56 template<typename CharT>
57 void test ( const CharT *s ) {
58     typedef std::basic_string_view<CharT> string_view_t;
59 
60     string_view_t sv1 ( s );
61 
62     test1(sv1,  0, 0);
63     test1(sv1,  1, 0);
64     test1(sv1, 20, 0);
65     test1(sv1, sv1.size(), 0);
66     test1(sv1, 20, string_view_t::npos);
67 
68     test1(sv1,   0, 3);
69     test1(sv1,   2, 3);
70     test1(sv1, 100, 3);
71     test1(sv1, 100, string_view_t::npos);
72 
73     test1(sv1, sv1.size(), string_view_t::npos);
74 
75     test1(sv1, sv1.size() + 1, 0);
76     test1(sv1, sv1.size() + 1, 1);
77     test1(sv1, sv1.size() + 1, string_view_t::npos);
78 }
79 
80 template<typename CharT>
81 TEST_CONSTEXPR_CXX20 bool test_constexpr_copy(const CharT *abcde, const CharT *ghijk, const CharT *bcdjk)
82 {
83     CharT buf[6] = {};
84     std::basic_string_view<CharT> lval(ghijk); lval.copy(buf, 6);
85     std::basic_string_view<CharT>(abcde).copy(buf, 3, 1);
86     assert(std::basic_string_view<CharT>(buf) == bcdjk);
87     return true;
88 }
89 
90 int main(int, char**) {
91     test ( "ABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDE" );
92     test ( "ABCDE");
93     test ( "a" );
94     test ( "" );
95 
96     test ( L"ABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDE" );
97     test ( L"ABCDE" );
98     test ( L"a" );
99     test ( L"" );
100 
101 #if TEST_STD_VER >= 11
102     test ( u"ABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDE" );
103     test ( u"ABCDE" );
104     test ( u"a" );
105     test ( u"" );
106 
107     test ( U"ABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDE" );
108     test ( U"ABCDE" );
109     test ( U"a" );
110     test ( U"" );
111 #endif
112 
113     test_constexpr_copy("ABCDE", "GHIJK", "BCDJK");
114     test_constexpr_copy(L"ABCDE", L"GHIJK", L"BCDJK");
115 #if TEST_STD_VER >= 11
116     test_constexpr_copy(u"ABCDE", u"GHIJK", u"BCDJK");
117     test_constexpr_copy(U"ABCDE", U"GHIJK", U"BCDJK");
118 #endif
119 #if TEST_STD_VER >= 17
120     test_constexpr_copy(u8"ABCDE", u8"GHIJK", u8"BCDJK");
121 #endif
122 #if TEST_STD_VER >= 20
123     static_assert(test_constexpr_copy("ABCDE", "GHIJK", "BCDJK"));
124     static_assert(test_constexpr_copy(L"ABCDE", L"GHIJK", L"BCDJK"));
125     static_assert(test_constexpr_copy(u"ABCDE", u"GHIJK", u"BCDJK"));
126     static_assert(test_constexpr_copy(U"ABCDE", U"GHIJK", U"BCDJK"));
127     static_assert(test_constexpr_copy(u8"ABCDE", u8"GHIJK", u8"BCDJK"));
128 #endif
129 
130   return 0;
131 }
132