libcxx/test/std/containers/views/mdspan/ConvertibleToIntegral.h

   1 //===----------------------------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #ifndef TEST_STD_CONTAINERS_VIEWS_MDSPAN_CONVERTIBLE_TO_INTEGRAL_H
  10 #define TEST_STD_CONTAINERS_VIEWS_MDSPAN_CONVERTIBLE_TO_INTEGRAL_H
  11
  12 struct IntType {
  13   int val;
  14   constexpr IntType() = default;
  15   constexpr IntType(int v) noexcept : val(v) {}
  16
  17   constexpr bool operator==(const IntType& rhs) const { return val == rhs.val; }
  18   constexpr operator int() const noexcept { return val; }
  19   constexpr operator unsigned char() const { return static_cast<unsigned char>(val); }
  20   constexpr operator signed char() const noexcept { return static_cast<signed char>(val); }
  21 };
  22
  23 // only non-const convertible
  24 struct IntTypeNC {
  25   int val;
  26   constexpr IntTypeNC() = default;
  27   constexpr IntTypeNC(int v) noexcept : val(v) {}
  28
  29   constexpr bool operator==(const IntType& rhs) const { return val == rhs.val; }
  30   constexpr operator int() noexcept { return val; }
  31   constexpr operator unsigned() { return static_cast<unsigned>(val); }
  32   constexpr operator char() noexcept { return static_cast<char>(val); }
  33 };
  34
  35 // weird configurability of convertibility to int
  36 template<bool conv_c, bool conv_nc, bool ctor_nt_c, bool ctor_nt_nc>
  37 struct IntConfig {
  38   int val;
  39   constexpr explicit IntConfig(int val_):val(val_){}
  40   constexpr operator int() noexcept(ctor_nt_nc) requires(conv_nc) { return val; }
  41   constexpr operator int() const noexcept(ctor_nt_c) requires(conv_c) { return val; }
  42 };
  43
  44 #endif // TEST_STD_CONTAINERS_VIEWS_MDSPAN_CONVERTIBLE_TO_INTEGRAL_H