1// -*- C++ -*-
 2//===----------------------------------------------------------------------===//
 3//
 4// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 5// See https://llvm.org/LICENSE.txt for license information.
 6// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 7//
 8//===----------------------------------------------------------------------===//
 9
10#ifndef _LIBCPP___CHRONO_STATICALLY_WIDEN_H
11#define _LIBCPP___CHRONO_STATICALLY_WIDEN_H
12
13// Implements the STATICALLY-WIDEN exposition-only function. ([time.general]/2)
14
15#include <__concepts/same_as.h>
16#include <__config>
17#include <__format/concepts.h>
18
19#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
20#  pragma GCC system_header
21#endif
22
23_LIBCPP_BEGIN_NAMESPACE_STD
24
25#if _LIBCPP_STD_VER >= 20
26
27#  if _LIBCPP_HAS_WIDE_CHARACTERS
28template <__fmt_char_type _CharT>
29_LIBCPP_HIDE_FROM_ABI constexpr const _CharT* __statically_widen(const char* __str, const wchar_t* __wstr) {
30  if constexpr (same_as<_CharT, char>)
31    return __str;
32  else
33    return __wstr;
34}
35#    define _LIBCPP_STATICALLY_WIDEN(_CharT, __str) ::std::__statically_widen<_CharT>(__str, L##__str)
36#  else // _LIBCPP_HAS_WIDE_CHARACTERS
37
38// Without this indirection the unit test test/libcxx/modules_include.sh.cpp
39// fails for the CI build "No wide characters". This seems like a bug.
40// TODO FMT investigate why this is needed.
41template <__fmt_char_type _CharT>
42_LIBCPP_HIDE_FROM_ABI constexpr const _CharT* __statically_widen(const char* __str) {
43  return __str;
44}
45#    define _LIBCPP_STATICALLY_WIDEN(_CharT, __str) ::std::__statically_widen<_CharT>(__str)
46#  endif // _LIBCPP_HAS_WIDE_CHARACTERS
47
48#endif // _LIBCPP_STD_VER >= 20
49
50_LIBCPP_END_NAMESPACE_STD
51
52#endif // _LIBCPP___CHRONO_STATICALLY_WIDEN_H