1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
|
//===----------------------------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// <string_view>
// void remove_prefix(size_type _n)
#include <experimental/string_view>
#include <cassert>
#include <iostream>
template<typename CharT>
void test ( const CharT *s, size_t len ) {
typedef std::experimental::basic_string_view<CharT> SV;
{
SV sv1 ( s );
assert ( sv1.size() == len );
assert ( sv1.data() == s );
if ( len > 0 ) {
sv1.remove_prefix ( 1 );
assert ( sv1.size() == (len - 1));
assert ( sv1.data() == (s + 1));
}
sv1.remove_prefix ( len - 1 );
assert ( sv1.size() == 0 );
SV sv2 ( s );
sv2.remove_prefix ( len << 1 );
assert ( sv1.size() == 0 );
}
}
#if _LIBCPP_STD_VER > 11
constexpr size_t test_ce ( size_t n, size_t k ) {
typedef std::experimental::basic_string_view<char> SV;
SV sv1{ "ABCDEFGHIJKL", n };
sv1.remove_prefix ( k );
return sv1.size();
}
#endif
int main () {
test ( "ABCDE", 5 );
test ( "a", 1 );
test ( "", 0 );
test ( L"ABCDE", 5 );
test ( L"a", 1 );
test ( L"", 0 );
#if __cplusplus >= 201103L
test ( u"ABCDE", 5 );
test ( u"a", 1 );
test ( u"", 0 );
test ( U"ABCDE", 5 );
test ( U"a", 1 );
test ( U"", 0 );
#endif
#if _LIBCPP_STD_VER > 11
{
static_assert ( test_ce ( 5, 0 ) == 5, "" );
static_assert ( test_ce ( 5, 1 ) == 4, "" );
static_assert ( test_ce ( 5, 5 ) == 0, "" );
static_assert ( test_ce ( 5, 9 ) == 0, "" );
static_assert ( test_ce ( 9, 3 ) == 6, "" );
}
#endif
}
|
