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
|
// PR c++/99287
// { dg-do compile { target c++20 } }
namespace std {
struct source_location {
static consteval source_location
current(const void *__p = __builtin_source_location()) {
source_location __ret;
__ret._M_impl = static_cast<const __impl *>(__p);
return __ret;
}
constexpr const char *function_name() {
return _M_impl ? _M_impl->_M_function_name : "";
}
struct __impl {
const char *_M_file_name;
const char *_M_function_name;
unsigned _M_line;
unsigned _M_column;
} const *_M_impl;
};
struct char_traits {
static constexpr long length(const char *__s) {
return __builtin_strlen(__s);
}
};
template <typename _CharT, typename _Traits = char_traits>
class basic_string_view {
public:
using traits_type = _Traits;
using size_type = unsigned long;
constexpr basic_string_view(const _CharT *__str)
: _M_len{traits_type::length(__str)}, _M_str{__str} {}
constexpr size_type find(const _CharT *, size_type, size_type) const noexcept;
constexpr size_type find(_CharT *__str) {
long __trans_tmp_1 = traits_type::length(__str);
return find(__str, 0, __trans_tmp_1);
}
long _M_len;
const _CharT *_M_str;
};
using string_view = basic_string_view<const char>;
template <typename _CharT, typename _Traits>
constexpr unsigned long
basic_string_view<_CharT, _Traits>::find(const _CharT *__str, size_type,
size_type __n) const noexcept {
int __trans_tmp_2;
const _CharT *__first = _M_str;
size_type __len = _M_len;
while (__len >= __n) {
__trans_tmp_2 = __builtin_memcmp(__first, __str, __n);
if (__trans_tmp_2 == 0)
return __first - _M_str;
__len = _M_str - ++__first;
}
}
} // namespace std
template <typename> consteval auto f() {
return std::string_view{std::source_location::current().function_name()};
}
int main() { constexpr auto s = f<int>().find("int"); }
|
