libcxx/test/algorithms/alg.sorting/alg.merge/inplace_merge.pass.cpp

//===----------------------------------------------------------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

// <algorithm>

// template<BidirectionalIterator Iter>
//   requires ShuffleIterator<Iter>
//         && LessThanComparable<Iter::value_type>
//   void
//   inplace_merge(Iter first, Iter middle, Iter last);

#include <algorithm>
#include <cassert>

#include "../../iterators.h"

template <class Iter>
void
test_one(unsigned N, unsigned M)
{
    assert(M <= N);
    int* ia = new int[N];
    for (unsigned i = 0; i < N; ++i)
        ia[i] = i;
    std::random_shuffle(ia, ia+N);
    std::sort(ia, ia+M);
    std::sort(ia+M, ia+N);
    std::inplace_merge(Iter(ia), Iter(ia+M), Iter(ia+N));
    if(N > 0)
    {
        assert(ia[0] == 0);
        assert(ia[N-1] == N-1);
        assert(std::is_sorted(ia, ia+N));
    }
    delete [] ia;
}

template <class Iter>
void
test(unsigned N)
{
    test_one<Iter>(N, 0);
    test_one<Iter>(N, N/4);
    test_one<Iter>(N, N/2);
    test_one<Iter>(N, 3*N/4);
    test_one<Iter>(N, N);
}

template <class Iter>
void
test()
{
    test_one<Iter>(0, 0);
    test_one<Iter>(1, 0);
    test_one<Iter>(1, 1);
    test_one<Iter>(2, 0);
    test_one<Iter>(2, 1);
    test_one<Iter>(2, 2);
    test_one<Iter>(3, 0);
    test_one<Iter>(3, 1);
    test_one<Iter>(3, 2);
    test_one<Iter>(3, 3);
    test<Iter>(4);
    test<Iter>(100);
    test<Iter>(1000);
}

int main()
{
    test<bidirectional_iterator<int*> >();
    test<random_access_iterator<int*> >();
    test<int*>();
}