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
|
// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef _LIBCPP___FORMAT_RANGE_FORMAT_H
#define _LIBCPP___FORMAT_RANGE_FORMAT_H
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif
#include <__concepts/same_as.h>
#include <__config>
#include <__format/fmt_pair_like.h>
#include <__ranges/concepts.h>
#include <__type_traits/remove_cvref.h>
_LIBCPP_BEGIN_NAMESPACE_STD
#if _LIBCPP_STD_VER >= 23
_LIBCPP_DIAGNOSTIC_PUSH
_LIBCPP_CLANG_DIAGNOSTIC_IGNORED("-Wshadow")
_LIBCPP_GCC_DIAGNOSTIC_IGNORED("-Wshadow")
// This shadows map, set, and string.
enum class range_format { disabled, map, set, sequence, string, debug_string };
_LIBCPP_DIAGNOSTIC_POP
template <class _Rp>
constexpr range_format format_kind = [] {
// [format.range.fmtkind]/1
// A program that instantiates the primary template of format_kind is ill-formed.
static_assert(sizeof(_Rp) != sizeof(_Rp), "create a template specialization of format_kind for your type");
return range_format::disabled;
}();
template <ranges::input_range _Rp>
requires same_as<_Rp, remove_cvref_t<_Rp>>
inline constexpr range_format format_kind<_Rp> = [] {
// [format.range.fmtkind]/2
// 2.1 If same_as<remove_cvref_t<ranges::range_reference_t<R>>, R> is true,
// Otherwise format_kind<R> is range_format::disabled.
if constexpr (same_as<remove_cvref_t<ranges::range_reference_t<_Rp>>, _Rp>)
return range_format::disabled;
// 2.2 Otherwise, if the qualified-id R::key_type is valid and denotes a type:
else if constexpr (requires { typename _Rp::key_type; }) {
// 2.2.1 If the qualified-id R::mapped_type is valid and denotes a type ...
if constexpr (requires { typename _Rp::mapped_type; } &&
// 2.2.1 ... If either U is a specialization of pair or U is a specialization
// of tuple and tuple_size_v<U> == 2
__fmt_pair_like<remove_cvref_t<ranges::range_reference_t<_Rp>>>)
return range_format::map;
else
// 2.2.2 Otherwise format_kind<R> is range_format::set.
return range_format::set;
} else
// 2.3 Otherwise, format_kind<R> is range_format::sequence.
return range_format::sequence;
}();
#endif // _LIBCPP_STD_VER >= 23
_LIBCPP_END_NAMESPACE_STD
#endif
|
