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view libstdc++-v3/testsuite/26_numerics/bit/bit.pow.two/has_single_bit.cc @ 152:2b5abeee2509
update gcc11
author | anatofuz |
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date | Mon, 25 May 2020 07:50:57 +0900 |
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// Copyright (C) 2018-2020 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 compile { target c++2a } } #include <bit> #include <limits> template<typename UInt> constexpr auto test(UInt x) -> decltype(std::has_single_bit(x)) { static_assert( noexcept(std::has_single_bit(x)) ); static_assert( ! std::has_single_bit( (UInt)0 ) ); static_assert( ! std::has_single_bit( (UInt)-1 ) ); static_assert( ! std::has_single_bit( (UInt)3 ) ); static_assert( ! std::has_single_bit( (UInt)0x0f ) ); static_assert( ! std::has_single_bit( (UInt)0xff ) ); static_assert( ! std::has_single_bit( (UInt)0x0a ) ); static_assert( ! std::has_single_bit( (UInt)0xa0 ) ); constexpr UInt one = 1; static_assert( std::has_single_bit( (UInt)(one << 0) ) ); static_assert( std::has_single_bit( (UInt)(one << 1) ) ); static_assert( std::has_single_bit( (UInt)(one << 2) ) ); static_assert( std::has_single_bit( (UInt)(one << 3) ) ); static_assert( std::has_single_bit( (UInt)(one << 4) ) ); static_assert( std::has_single_bit( (UInt)(one << 5) ) ); static_assert( std::has_single_bit( (UInt)(one << 6) ) ); static_assert( std::has_single_bit( (UInt)(one << 7) ) ); if constexpr (std::numeric_limits<UInt>::digits > 8) { static_assert( std::has_single_bit( (UInt)(one << 8) ) ); static_assert( std::has_single_bit( (UInt)(one << 9) ) ); static_assert( std::has_single_bit( (UInt)(one << 10) ) ); static_assert( std::has_single_bit( (UInt)(one << 11) ) ); static_assert( std::has_single_bit( (UInt)(one << 12) ) ); static_assert( std::has_single_bit( (UInt)(one << 13) ) ); static_assert( std::has_single_bit( (UInt)(one << 14) ) ); static_assert( std::has_single_bit( (UInt)(one << 15) ) ); static_assert( ! std::has_single_bit( (UInt)0xf000 ) ); static_assert( ! std::has_single_bit( (UInt)0xff00 ) ); static_assert( ! std::has_single_bit( (UInt)0xf0f0 ) ); static_assert( ! std::has_single_bit( (UInt)0xf00f ) ); static_assert( ! std::has_single_bit( (UInt)0x0f0f ) ); static_assert( ! std::has_single_bit( (UInt)0x00ff ) ); } if constexpr (std::numeric_limits<UInt>::digits > 16) { static_assert( std::has_single_bit( (UInt)(one << 16) ) ); static_assert( std::has_single_bit( (UInt)(one << 17) ) ); static_assert( ! std::has_single_bit( (UInt)((one << 16) + 1) ) ); static_assert( ! std::has_single_bit( (UInt)((one << 16) + 0x10) ) ); } // msp340 target has 20-bit __GLIBCXX_TYPE_INT_N_0 type if constexpr (std::numeric_limits<UInt>::digits > 20) { static_assert( std::has_single_bit( (UInt)(one << 20) ) ); static_assert( std::has_single_bit( (UInt)(one << 21) ) ); static_assert( std::has_single_bit( (UInt)(one << 24) ) ); static_assert( std::has_single_bit( (UInt)(one << 28) ) ); static_assert( std::has_single_bit( (UInt)(one << 31) ) ); } if constexpr (std::numeric_limits<UInt>::digits > 32) { static_assert( std::has_single_bit( (UInt)(one << 32) ) ); static_assert( std::has_single_bit( (UInt)(one << 33) ) ); static_assert( std::has_single_bit( (UInt)(one << 41) ) ); static_assert( ! std::has_single_bit( (UInt)((one << 32) + 1) ) ); static_assert( ! std::has_single_bit( (UInt)((one << 32) + (one << 31)) ) ); static_assert( ! std::has_single_bit( (UInt)((one << 33) + 1) ) ); static_assert( ! std::has_single_bit( (UInt)((one << 33) + (one << 32)) ) ); } if constexpr (std::numeric_limits<UInt>::digits == 64) { static_assert( std::has_single_bit( (UInt)(one << 63) ) ); static_assert( ! std::has_single_bit( (UInt)((one << 63) + 1) ) ); static_assert( ! std::has_single_bit( (UInt)((one << 63) + (one << 8)) ) ); static_assert( ! std::has_single_bit( (UInt)((one << 63) + (one << 32)) ) ); } return true; } static_assert( test( (unsigned char)0 ) ); static_assert( test( (unsigned short)0 ) ); static_assert( test( (unsigned int)0 ) ); static_assert( test( (unsigned long)0 ) ); static_assert( test( (unsigned long long)0 ) ); // std::has_single_bit(T) shall not participate in overload resolution // unless T is an unsigned integer type. struct X { constexpr bool did_not_match() { return true; } }; constexpr X test(...) { return X{}; } static_assert( test( (bool)0 ).did_not_match() ); static_assert( test( (char)0 ).did_not_match() ); static_assert( test( (int)0 ).did_not_match() ); static_assert( test( (char16_t)0 ).did_not_match() ); static_assert( test( (float)0 ).did_not_match() ); static_assert( test( (void*)0 ).did_not_match() ); static_assert( test( X{} ).did_not_match() ); enum E : unsigned { e }; static_assert( test( e ).did_not_match() ); #if !defined(__STRICT_ANSI__) && defined _GLIBCXX_USE_INT128 static_assert( test( (unsigned __int128)0 ) ); static_assert( test( (__int128)0 ).did_not_match() ); #endif #if defined(__GLIBCXX_TYPE_INT_N_0) static_assert( test( (unsigned __GLIBCXX_TYPE_INT_N_0)0 ) ); static_assert( test( (__GLIBCXX_TYPE_INT_N_0)0 ).did_not_match() ); #endif #if defined(__GLIBCXX_TYPE_INT_N_1) static_assert( test( (unsigned __GLIBCXX_TYPE_INT_N_1)0 ) ); static_assert( test( (__GLIBCXX_TYPE_INT_N_1)0 ).did_not_match() ); #endif #if defined(__GLIBCXX_TYPE_INT_N_2) static_assert( test( (unsigned __GLIBCXX_TYPE_INT_N_2)0 ) ); static_assert( test( (__GLIBCXX_TYPE_INT_N_2)0 ).did_not_match() ); #endif #include <cstddef> static_assert( test( (std::byte)0 ).did_not_match() );