| // Copyright (C) 2019-2023 Free Software Foundation, Inc. |
| // |
| // This file is part of the GNU ISO C++ Library. This library is free |
| // software; you can redistribute it and/or modify it under the |
| // terms of the GNU General Public License as published by the |
| // Free Software Foundation; either version 3, or (at your option) |
| // any later version. |
| |
| // This library is distributed in the hope that it will be useful, |
| // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| // GNU General Public License for more details. |
| |
| // You should have received a copy of the GNU General Public License along |
| // with this library; see the file COPYING3. If not see |
| // <http://www.gnu.org/licenses/>. |
| |
| // { dg-options "-std=gnu++2a" } |
| // { dg-do run { target c++2a } } |
| |
| #include <numeric> |
| |
| #ifndef __cpp_lib_interpolate |
| # error "Feature-test macro for midpoint and lerp missing in <numeric>" |
| #elif __cpp_lib_interpolate != 201902L |
| # error "Feature-test macro for midpoint and lerp has wrong value in <numeric>" |
| #endif |
| |
| #include <climits> |
| #include <testsuite_hooks.h> |
| |
| static_assert(std::is_same_v<decltype(std::midpoint(0, 1)), int>); |
| static_assert(noexcept(std::midpoint(1, 2))); |
| |
| struct test_type { }; |
| template<typename T> decltype(std::midpoint<T>(T(), T())) try_midpoint(int); |
| template<typename T> test_type try_midpoint(...); |
| template<typename T> constexpr bool no_midpoint() |
| { return std::is_same_v<decltype(try_midpoint<T>()), test_type>; } |
| |
| static_assert(no_midpoint<bool>()); |
| static_assert(no_midpoint<const bool>()); |
| static_assert(no_midpoint<const int>()); |
| static_assert(no_midpoint<volatile int>()); |
| |
| static_assert( std::midpoint(0, 0) == 0 ); |
| static_assert( std::midpoint(1, 1) == 1 ); |
| static_assert( std::midpoint(0, 1) == 0 ); |
| static_assert( std::midpoint(1, 0) == 1 ); |
| static_assert( std::midpoint(0, 2) == 1 ); |
| static_assert( std::midpoint(3, 2) == 3 ); |
| static_assert( std::midpoint(-5, 4) == -1 ); |
| static_assert( std::midpoint(5, -4) == 1 ); |
| static_assert( std::midpoint(-5, -4) == -5 ); |
| static_assert( std::midpoint(-4, -5) == -4 ); |
| static_assert( std::midpoint(INT_MIN, INT_MAX) == -1 ); |
| static_assert( std::midpoint(INT_MAX, INT_MIN) == 0 ); |
| static_assert( std::midpoint(INT_MAX, INT_MAX) == INT_MAX ); |
| static_assert( std::midpoint(INT_MAX, INT_MAX-1) == INT_MAX ); |
| static_assert( std::midpoint(INT_MAX-1, INT_MAX-1) == INT_MAX-1 ); |
| static_assert( std::midpoint(INT_MAX-1, INT_MAX) == INT_MAX-1 ); |
| static_assert( std::midpoint(INT_MAX, INT_MAX-2) == INT_MAX-1 ); |
| |
| static_assert( std::midpoint(0u, 0u) == 0 ); |
| static_assert( std::midpoint(0u, 1u) == 0 ); |
| static_assert( std::midpoint(1u, 0u) == 1 ); |
| static_assert( std::midpoint(0u, 2u) == 1 ); |
| static_assert( std::midpoint(3u, 2u) == 3 ); |
| static_assert( std::midpoint(0u, UINT_MAX) == UINT_MAX/2 ); |
| static_assert( std::midpoint(UINT_MAX, 0u) == (UINT_MAX/2 + 1) ); |
| static_assert( std::midpoint(UINT_MAX, UINT_MAX) == UINT_MAX ); |
| static_assert( std::midpoint(UINT_MAX, UINT_MAX-1) == UINT_MAX ); |
| static_assert( std::midpoint(UINT_MAX-1, UINT_MAX-1) == UINT_MAX-1 ); |
| static_assert( std::midpoint(UINT_MAX-1, UINT_MAX) == UINT_MAX-1 ); |
| static_assert( std::midpoint(UINT_MAX, UINT_MAX-2) == UINT_MAX-1 ); |
| |
| static_assert( std::midpoint<short>(0, 0) == 0 ); |
| static_assert( std::midpoint<short>(0, 1) == 0 ); |
| static_assert( std::midpoint<short>(1, 0) == 1 ); |
| static_assert( std::midpoint<short>(0, 2) == 1 ); |
| static_assert( std::midpoint<short>(3, 2) == 3 ); |
| static_assert( std::midpoint<short>(-5, 4) == -1 ); |
| static_assert( std::midpoint<short>(5, -4) == 1 ); |
| static_assert( std::midpoint<short>(-5, -4) == -5 ); |
| static_assert( std::midpoint<short>(-4, -5) == -4 ); |
| static_assert( std::midpoint<short>(SHRT_MIN, SHRT_MAX) == -1 ); |
| static_assert( std::midpoint<short>(SHRT_MAX, SHRT_MIN) == 0 ); |
| static_assert( std::midpoint<short>(SHRT_MAX, SHRT_MAX) == SHRT_MAX ); |
| static_assert( std::midpoint<short>(SHRT_MAX, SHRT_MAX-1) == SHRT_MAX ); |
| static_assert( std::midpoint<short>(SHRT_MAX-1, SHRT_MAX-1) == SHRT_MAX-1 ); |
| static_assert( std::midpoint<short>(SHRT_MAX-1, SHRT_MAX) == SHRT_MAX-1 ); |
| static_assert( std::midpoint<short>(SHRT_MAX, SHRT_MAX-2) == SHRT_MAX-1 ); |
| |
| static_assert( std::midpoint<signed char>(0, 0) == 0 ); |
| static_assert( std::midpoint<signed char>(1, 1) == 1 ); |
| static_assert( std::midpoint<signed char>(0, 1) == 0 ); |
| static_assert( std::midpoint<signed char>(1, 0) == 1 ); |
| static_assert( std::midpoint<signed char>(0, 2) == 1 ); |
| static_assert( std::midpoint<signed char>(3, 2) == 3 ); |
| static_assert( std::midpoint<signed char>(-5, 4) == -1 ); |
| static_assert( std::midpoint<signed char>(5, -4) == 1 ); |
| static_assert( std::midpoint<signed char>(-5, -4) == -5 ); |
| static_assert( std::midpoint<signed char>(-4, -5) == -4 ); |
| static_assert( std::midpoint<signed char>(SCHAR_MIN, SCHAR_MAX) == -1 ); |
| static_assert( std::midpoint<signed char>(SCHAR_MAX, SCHAR_MIN) == 0 ); |
| static_assert( std::midpoint<signed char>(SCHAR_MAX, SCHAR_MAX) == SCHAR_MAX ); |
| static_assert( std::midpoint<signed char>(SCHAR_MAX, SCHAR_MAX-1) == SCHAR_MAX); |
| |
| void |
| test01() |
| { |
| // Test every possibility for signed char. |
| for (int a = SCHAR_MIN; a <= SCHAR_MAX; ++a) |
| for (int b = SCHAR_MIN; b <= SCHAR_MAX; ++b) |
| VERIFY( std::midpoint(a, b) == std::midpoint<int>(a, b) ); |
| } |
| |
| int main() |
| { |
| test01(); |
| } |