include/o3tl/concepts.hxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  */
   9
  10 #pragma once
  11
  12 #include <sal/config.h>
  13
  14 #include <concepts>
  15
  16 // LLVM 12 libc++ only provides a bare-bones <concepts> that lacks most of its C++20 content, so
  17 // replicate here fore now what we need:
  18
  19 #if defined __cpp_lib_concepts
  20
  21 namespace o3tl
  22 {
  23 using std::integral;
  24 using std::signed_integral;
  25 using std::unsigned_integral;
  26 using std::floating_point;
  27 }
  28
  29 #else
  30
  31 #include <type_traits>
  32
  33 namespace o3tl
  34 {
  35 // Taken from the C++20 spec:
  36
  37 template <typename T> concept integral = std::is_integral_v<T>;
  38
  39 template <typename T> concept signed_integral = integral<T>&& std::is_signed_v<T>;
  40
  41 template <typename T> concept unsigned_integral = integral<T> && !signed_integral<T>;
  42
  43 template <typename T> concept floating_point = std::is_floating_point_v<T>;
  44 }
  45
  46 #endif
  47
  48 /* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */