99 lines
3.6 KiB
C++
99 lines
3.6 KiB
C++
// Copyright (C) 2018-2024 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License along
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// with this library; see the file COPYING3. If not see
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// <http://www.gnu.org/licenses/>.
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// { dg-do compile { target c++20 } }
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#include <bit>
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#include <limits>
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template<typename UInt>
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constexpr auto
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test(UInt x)
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-> decltype(std::popcount(x))
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{
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static_assert( noexcept(std::popcount(x)) );
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constexpr unsigned digits = std::numeric_limits<UInt>::digits;
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static_assert( std::popcount((UInt)0) == 0 );
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static_assert( std::popcount((UInt)-1) == digits );
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static_assert( std::popcount((UInt)-2) == digits - 1 );
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static_assert( std::popcount((UInt)127) == 7 );
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static_assert( std::popcount((UInt)1) == 1 );
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static_assert( std::popcount((UInt)2) == 1 );
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static_assert( std::popcount((UInt)0x70) == 3 );
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if constexpr (std::numeric_limits<UInt>::digits > 8)
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{
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static_assert( std::popcount((UInt)(0x101)) == 2 );
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static_assert( std::popcount((UInt)(0xfff)) == 12 );
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}
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if constexpr (std::numeric_limits<UInt>::digits > 64)
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{
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static_assert( std::popcount((UInt)0xffffffffffffffff) == 64 );
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static_assert( std::popcount(0x5555555555555555 | ((UInt)1 << 64)) == 33 );
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static_assert( std::popcount(0x5555555555555555 | ((UInt)3 << 64)) == 34 );
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}
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return true;
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}
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static_assert( test( (unsigned char)0 ) );
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static_assert( test( (unsigned short)0 ) );
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static_assert( test( (unsigned int)0 ) );
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static_assert( test( (unsigned long)0 ) );
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static_assert( test( (unsigned long long)0 ) );
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// std::popcount(T) shall not participate in overload resolution
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// unless T is an unsigned integer type.
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struct X { constexpr bool did_not_match() { return true; } };
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constexpr X test(...) { return X{}; }
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static_assert( test( (bool)0 ).did_not_match() );
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static_assert( test( (char)0 ).did_not_match() );
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static_assert( test( (int)0 ).did_not_match() );
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static_assert( test( (char16_t)0 ).did_not_match() );
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static_assert( test( (float)0 ).did_not_match() );
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static_assert( test( (void*)0 ).did_not_match() );
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static_assert( test( X{} ).did_not_match() );
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enum E : unsigned { e };
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static_assert( test( e ).did_not_match() );
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#if !defined(__STRICT_ANSI__) && defined __SIZEOF_INT128__
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static_assert( test( (unsigned __int128)0 ) );
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static_assert( test( (__int128)0 ).did_not_match() );
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#endif
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#if defined(__GLIBCXX_TYPE_INT_N_0)
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static_assert( test( (unsigned __GLIBCXX_TYPE_INT_N_0)0 ) );
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static_assert( test( (__GLIBCXX_TYPE_INT_N_0)0 ).did_not_match() );
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#endif
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#if defined(__GLIBCXX_TYPE_INT_N_1)
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static_assert( test( (unsigned __GLIBCXX_TYPE_INT_N_1)0 ) );
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static_assert( test( (__GLIBCXX_TYPE_INT_N_1)0 ).did_not_match() );
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#endif
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#if defined(__GLIBCXX_TYPE_INT_N_2)
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static_assert( test( (unsigned __GLIBCXX_TYPE_INT_N_2)0 ) );
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static_assert( test( (__GLIBCXX_TYPE_INT_N_2)0 ).did_not_match() );
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#endif
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#if defined(__GLIBCXX_TYPE_INT_N_3)
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static_assert( test( (unsigned __GLIBCXX_TYPE_INT_N_3)0 ) );
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static_assert( test( (__GLIBCXX_TYPE_INT_N_3)0 ).did_not_match() );
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#endif
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#include <cstddef>
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static_assert( test( (std::byte)0 ).did_not_match() );
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