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// Copyright (C) 2018-2019 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>
template<typename UInt>
constexpr auto
test(UInt x)
-> decltype(std::popcount(x))
{
static_assert( noexcept(std::popcount(x)) );
constexpr unsigned digits = std::numeric_limits<UInt>::digits;
static_assert( std::popcount((UInt)0) == 0 );
static_assert( std::popcount((UInt)-1) == digits );
static_assert( std::popcount((UInt)-2) == digits - 1 );
static_assert( std::popcount((UInt)127) == 7 );
static_assert( std::popcount((UInt)1) == 1 );
static_assert( std::popcount((UInt)2) == 1 );
static_assert( std::popcount((UInt)0x70) == 3 );
if constexpr (std::numeric_limits<UInt>::digits > 8)
{
static_assert( std::popcount((UInt)(0x101)) == 2 );
static_assert( std::popcount((UInt)(0xfff)) == 12 );
}
if constexpr (std::numeric_limits<UInt>::digits > 64)
{
static_assert( std::popcount((UInt)0xffffffffffffffff) == 64 );
static_assert( std::popcount(0x5555555555555555 | ((UInt)1 << 64)) == 33 );
static_assert( std::popcount(0x5555555555555555 | ((UInt)3 << 64)) == 34 );
}
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::popcount(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() );
#ifndef __STRICT_ANSI__
#include <cstddef>
static_assert( std::popcount(std::byte{0x00}) == 0 );
static_assert( std::popcount(std::byte{0x01}) == 1 );
static_assert( std::popcount(std::byte{0x02}) == 1 );
static_assert( std::popcount(std::byte{0x03}) == 2 );
static_assert( std::popcount(std::byte{0x30}) == 2 );
static_assert( std::popcount(std::byte{0x40}) == 1 );
static_assert( std::popcount(std::byte{0x41}) == 2 );
static_assert( std::popcount(std::byte{0xff}) == 8 );
#else
static_assert( test( (std::byte)0 ).did_not_match() );
#endif
#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
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