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// Copyright (C) 2020-2023 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 <algorithm>
#include <vector>
#include <testsuite_hooks.h>
#include <testsuite_iterators.h>
using __gnu_test::test_container;
using __gnu_test::test_range;
using __gnu_test::bidirectional_iterator_wrapper;
namespace ranges = std::ranges;
struct X
{
int i;
int moved = 0;
constexpr X() : i(0) { }
constexpr X(int a) : i(a) { }
constexpr X(const X&) = delete;
constexpr X& operator=(const X&) = delete;
constexpr X(X&& other)
{
*this = std::move(other);
}
constexpr X&
operator=(X&& other)
{
other.moved++;
i = other.i;
return *this;
}
friend constexpr bool
operator==(const X& a, const X& b)
{ return a.i == b.i; }
};
void
test01()
{
{
X x[7] = { 1, 2, 3, 4, 5, 6, 7 };
X y[7] = { 0, 0, 0, 0, 0, 0, 0 };
X z[7] = { 1, 2, 3, 4, 5, 6, 7 };
auto [in, out] = ranges::move_backward(x, y+7);
VERIFY( ranges::equal(x, y) && in == x+7 && out == y );
VERIFY( ranges::equal(x, z) );
}
{
int x[3] = { 1, 2, 3 };
char y[4] = { 0 };
int z[3] = { 1, 2, 3 };
test_container<int, bidirectional_iterator_wrapper> cx(x);
test_container<char, bidirectional_iterator_wrapper> cy(y);
auto [in, out] = ranges::move_backward(cx, cy.end());
VERIFY( ranges::equal(x, x+3, y+1, y+4) && in.ptr == x+3 && out.ptr == y+1 );
VERIFY( ranges::equal(x, z) );
}
{
std::vector<char> x= {1,2,3};
std::vector<int> y(3);
const int z[3] = { 1, 2, 3 };
auto [in, out] = ranges::move_backward(x, ranges::end(y));
VERIFY( in == x.begin()+3 );
VERIFY( out == y.begin() );
VERIFY( ranges::equal(y, z) && ranges::equal(x, z) );
}
{
std::vector<int> x = {1,2,3};
std::vector<int> y(3);
const int z[3] = { 1, 2, 3 };
auto [in, out] = ranges::move_backward(x, ranges::end(y));
VERIFY( in == x.begin()+3 );
VERIFY( out == y.begin() );
VERIFY( ranges::equal(y, z) && ranges::equal(x, z) );
}
{
std::vector<int> x = {1,2,3};
std::vector<int> y(3);
const int z[3] = { 1, 2, 3 };
auto [in,out] = ranges::move_backward(make_reverse_iterator(x.end()),
make_reverse_iterator(x.begin()),
make_reverse_iterator(y.begin()));
VERIFY( in.base() == x.begin()+3 );
VERIFY( out.base() == y.begin()+3 );
VERIFY( ranges::equal(y, z) && ranges::equal(x, z) );
}
{
std::vector<char> x = {1,2,3};
std::vector<int> y(3);
const int z[3] = { 1, 2, 3 };
auto [in,out] = ranges::move_backward(make_reverse_iterator(x.end()),
make_reverse_iterator(x.begin()),
make_reverse_iterator(y.begin()));
VERIFY( in.base() == x.begin()+3 );
VERIFY( out.base() == y.begin()+3 );
VERIFY( ranges::equal(y, z) && ranges::equal(x, z) );
}
}
void
test02()
{
X x[] = { {2}, {2}, {6}, {8}, {10} };
X y[] = { {2}, {6}, {8}, {10}, {11}, {2} };
const X z[] = { {2}, {2}, {6}, {8}, {10} };
auto [in, out] = ranges::move_backward(x, ranges::end(y));
VERIFY( ranges::equal(x, x+5, y+1, y+6) );
VERIFY( in == x+5 );
VERIFY( out == y+1 );
VERIFY( y[0].i == 2 );
VERIFY( ranges::equal(x, z) );
VERIFY( ranges::count(x, 1, &X::moved) == 5 );
VERIFY( ranges::count(y, 0, &X::moved) == 6 );
}
constexpr bool
test03()
{
bool ok = true;
X x[] = { {2}, {2}, {6}, {8}, {10} };
X y[] = { {2}, {6}, {8}, {10}, {11}, {2} };
const X z[] = { {2}, {2}, {6}, {8}, {10} };
auto [in, out] = ranges::move_backward(x, ranges::end(y));
ok &= ranges::equal(x, x+5, y+1, y+6);
ok &= (in == x+5);
ok &= (out == y+1);
ok &= (y[0].i == 2);
ok &= ranges::equal(x, z);
ok &= ranges::count(x, 1, &X::moved) == 5;
ok &= ranges::count(y, 0, &X::moved) == 6;
return ok;
}
int
main()
{
test01();
test02();
static_assert(test03());
}