diff options
author | Ahmad Samir <a.samirh78@gmail.com> | 2023-04-08 23:24:17 +0200 |
---|---|---|
committer | Thiago Macieira <thiago.macieira@intel.com> | 2023-05-05 16:17:54 -0700 |
commit | bde5eeecaf35f7b7a94b7878289a8e7fcd057afa (patch) | |
tree | 31c2b6f621167e60652086420a31027c0b39a564 /src/corelib/global | |
parent | ce5eaeea59e4ccf5e38cfadfaa98bbdb7f10058c (diff) | |
download | qtbase-bde5eeecaf35f7b7a94b7878289a8e7fcd057afa.tar.gz |
q20: add C++20 chrono days/weeks/months/years
Change-Id: Ie2a167cbe6672694e15b7810daf7fad3fe0656a1
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Diffstat (limited to 'src/corelib/global')
-rw-r--r-- | src/corelib/global/q20chrono.h | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/src/corelib/global/q20chrono.h b/src/corelib/global/q20chrono.h new file mode 100644 index 0000000000..177d307e21 --- /dev/null +++ b/src/corelib/global/q20chrono.h @@ -0,0 +1,62 @@ +// Copyright (C) 2023 Ahmad Samir <a.samirh78@gmail.com> +// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only + +#ifndef Q20CHRONO_H +#define Q20CHRONO_H + +#include <QtCore/qtconfigmacros.h> + +#include <chrono> + +// +// W A R N I N G +// ------------- +// +// This file is not part of the Qt API. Types and functions defined in this +// file can reliably be replaced by their std counterparts, once available. +// You may use these definitions in your own code, but be aware that we +// will remove them once Qt depends on the C++ version that supports +// them in namespace std. There will be NO deprecation warning, the +// definitions will JUST go away. +// +// If you can't agree to these terms, don't use these definitions! +// +// We mean it. +// + +QT_BEGIN_NAMESPACE + +namespace q20 { +namespace chrono { + +#if defined(__GLIBCXX__) +// https://gcc.gnu.org/git/?p=gcc.git;a=blob;f=libstdc%2B%2B-v3/include/bits/chrono.h +using IntRep = int64_t; +#else +// https://github.com/llvm/llvm-project/blob/main/libcxx/include/__chrono/duration.h +// https://github.com/microsoft/STL/blob/main/stl/inc/__msvc_chrono.hpp +using IntRep = int; +#endif + +#if __cpp_lib_chrono >= 201611L && __cplusplus > 201703L +using std::chrono::days; +using std::chrono::weeks; +using std::chrono::years; +using std::chrono::months; + +static_assert(std::is_same_v<days::rep, IntRep>); +static_assert(std::is_same_v<weeks::rep, IntRep>); +static_assert(std::is_same_v<years::rep, IntRep>); +static_assert(std::is_same_v<months::rep, IntRep>); +#else // __cpp_lib_chrono >= 201907L +using days = std::chrono::duration<IntRep, std::ratio<86400>>; +using weeks = std::chrono::duration<IntRep, std::ratio_multiply<std::ratio<7>, days::period>>; +using years = std::chrono::duration<IntRep, std::ratio_multiply<std::ratio<146097, 400>, days::period>>; +using months = std::chrono::duration<IntRep, std::ratio_divide<years::period, std::ratio<12>>>; +#endif // __cpp_lib_chrono >= 201611L +} // namespace chrono +} // namespace q20 + +QT_END_NAMESPACE + +#endif /* Q20CHRONO_H */ |