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// Range v3 library
//
// Copyright Eric Niebler 2014-present
//
// Use, modification and distribution is subject to the
// Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//
// Project home: https://github.com/ericniebler/range-v3
//===----------------------------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include <algorithm>
#include <memory>
#include <random>
#include <vector>
#include <range/v3/core.hpp>
#include <range/v3/algorithm/partial_sort_copy.hpp>
#include "../simple_test.hpp"
#include "../test_utils.hpp"
#include "../test_iterators.hpp"
RANGES_DIAGNOSTIC_IGNORE_GLOBAL_CONSTRUCTORS
RANGES_DIAGNOSTIC_IGNORE_SIGN_CONVERSION
namespace
{
std::mt19937 gen;
template<class Iter>
void
test_larger_sorts(int N, int M)
{
auto partial_sort_copy = ::make_testable_2<true, false>(ranges::partial_sort_copy);
int* input = new int[N];
int* output = new int[M];
for (int i = 0; i < N; ++i)
input[i] = i;
std::shuffle(input, input+N, gen);
partial_sort_copy(Iter(input), Iter(input+N), output, output+M).check([&](int* r)
{
int* e = output + std::min(N, M);
CHECK(r == e);
int i = 0;
for (int* x = output; x < e; ++x, ++i)
CHECK(*x == i);
std::shuffle(input, input+N, gen);
});
partial_sort_copy(Iter(input), Iter(input+N), output, output+M, std::greater<int>()).check([&](int* r)
{
int* e = output + std::min(N, M);
CHECK(r == e);
int i = N-1;
for (int* x = output; x < e; ++x, --i)
CHECK(*x == i);
std::shuffle(input, input+N, gen);
});
delete [] output;
delete [] input;
}
template<class Iter>
void
test_larger_sorts(int N)
{
test_larger_sorts<Iter>(N, 0);
test_larger_sorts<Iter>(N, 1);
test_larger_sorts<Iter>(N, 2);
test_larger_sorts<Iter>(N, 3);
test_larger_sorts<Iter>(N, N/2-1);
test_larger_sorts<Iter>(N, N/2);
test_larger_sorts<Iter>(N, N/2+1);
test_larger_sorts<Iter>(N, N-2);
test_larger_sorts<Iter>(N, N-1);
test_larger_sorts<Iter>(N, N);
test_larger_sorts<Iter>(N, N+1000);
}
template<class Iter>
void
test()
{
test_larger_sorts<Iter>(0, 100);
test_larger_sorts<Iter>(10);
test_larger_sorts<Iter>(256);
test_larger_sorts<Iter>(257);
test_larger_sorts<Iter>(499);
test_larger_sorts<Iter>(500);
test_larger_sorts<Iter>(997);
test_larger_sorts<Iter>(1000);
test_larger_sorts<Iter>(1009);
}
struct S
{
int i;
};
struct U
{
int i;
U & operator=(S s)
{
i = s.i;
return *this;
}
};
}
constexpr bool test_constexpr()
{
using namespace ranges;
using IL = std::initializer_list<int>;
int output[9] = {0};
int * r = partial_sort_copy(IL{5, 3, 4, 1, 8, 2, 6, 7, 0, 9}, output, less{});
int * e = output + 9;
STATIC_CHECK_RETURN(r == e);
int i = 0;
for(int * x = output; x < e; ++x, ++i)
{
STATIC_CHECK_RETURN(*x == i);
}
return true;
}
int main()
{
int i = 0;
int * r = ranges::partial_sort_copy(&i, &i, &i, &i+5);
CHECK(r == &i);
CHECK(i == 0);
test<InputIterator<const int*> >();
test<ForwardIterator<const int*> >();
test<BidirectionalIterator<const int*> >();
test<RandomAccessIterator<const int*> >();
test<const int*>();
// Check projections
{
constexpr int N = 256;
constexpr int M = N/2-1;
S input[N];
U output[M];
for (int j = 0; j < N; ++j)
input[j].i = j;
std::shuffle(input, input+N, gen);
U * r2 = ranges::partial_sort_copy(input, output, std::less<int>(), &S::i, &U::i);
U* e = output + std::min(N, M);
CHECK(r2 == e);
int i2 = 0;
for (U* x = output; x < e; ++x, ++i2)
CHECK(x->i == i2);
}
// Check rvalue ranges
{
constexpr int N = 256;
constexpr int M = N/2-1;
S input[N];
U output[M];
for (int j = 0; j < N; ++j)
input[j].i = j;
std::shuffle(input, input+N, gen);
auto r0 = ranges::partial_sort_copy(input, std::move(output), std::less<int>(), &S::i, &U::i);
U* e = output + std::min(N, M);
#ifndef RANGES_WORKAROUND_MSVC_573728
CHECK(::is_dangling(r0));
#endif // RANGES_WORKAROUND_MSVC_573728
int i2 = 0;
for (U* x = output; x < e; ++x, ++i2)
CHECK(x->i == i2);
std::vector<U> vec(M);
auto r1 = ranges::partial_sort_copy(input, std::move(vec), std::less<int>(), &S::i, &U::i);
e = vec.data() + std::min(N, M);
CHECK(::is_dangling(r1));
i2 = 0;
for (U* x = vec.data(); x < e; ++x, ++i2)
CHECK(x->i == i2);
}
{
STATIC_CHECK(test_constexpr());
}
return ::test_result();
}
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