//===----------------------------------------------------------------------===//
//
//                     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.
//
//===----------------------------------------------------------------------===//

// <deque>

// iterator insert (const_iterator p, const value_type& v);

#include <deque>
#include <cassert>

std::deque<int>
make(int size, int start = 0 )
{
    const int b = 4096 / sizeof(int);
    int init = 0;
    if (start > 0)
    {
        init = (start+1) / b + ((start+1) % b != 0);
        init *= b;
        --init;
    }
    std::deque<int> c(init, 0);
    for (int i = 0; i < init-start; ++i)
        c.pop_back();
    for (int i = 0; i < size; ++i)
        c.push_back(i);
    for (int i = 0; i < start; ++i)
        c.pop_front();
    return c;
};

void
test(int P, std::deque<int>& c1, int x)
{
    typedef std::deque<int> C;
    typedef C::iterator I;
    typedef C::const_iterator CI;
    std::size_t c1_osize = c1.size();
    CI i = c1.insert(c1.begin() + P, x);
    assert(i == c1.begin() + P);
    assert(c1.size() == c1_osize + 1);
    assert(distance(c1.begin(), c1.end()) == c1.size());
    i = c1.begin();
    for (int j = 0; j < P; ++j, ++i)
        assert(*i == j);
    assert(*i == x);
    ++i;
    for (int j = P; j < c1_osize; ++j, ++i)
        assert(*i == j);
}

void
testN(int start, int N)
{
    typedef std::deque<int> C;
    typedef C::iterator I;
    typedef C::const_iterator CI;
    for (int i = 0; i <= 3; ++i)
    {
        if (0 <= i && i <= N)
        {
            C c1 = make(N, start);
            test(i, c1, -10);
        }
    }
    for (int i = N/2-1; i <= N/2+1; ++i)
    {
        if (0 <= i && i <= N)
        {
            C c1 = make(N, start);
            test(i, c1, -10);
        }
    }
    for (int i = N - 3; i <= N; ++i)
    {
        if (0 <= i && i <= N)
        {
            C c1 = make(N, start);
            test(i, c1, -10);
        }
    }
}

void
self_reference_test()
{
    typedef std::deque<int> C;
    typedef C::const_iterator CI;
    for (int i = 0; i < 20; ++i)
    {
        for (int j = 0; j < 20; ++j)
        {
            C c = make(20);
            CI it = c.cbegin() + i;
            CI jt = c.cbegin() + j;
            c.insert(it, *jt);
            assert(c.size() == 21);
            assert(distance(c.begin(), c.end()) == c.size());
            it = c.cbegin();
            for (int k = 0; k < i; ++k, ++it)
                assert(*it == k);
            assert(*it == j);
            ++it;
            for (int k = i; k < 20; ++k, ++it)
                assert(*it == k);
        }
    }
}

int main()
{
    int rng[] = {0, 1, 2, 3, 1023, 1024, 1025, 2047, 2048, 2049};
    const int N = sizeof(rng)/sizeof(rng[0]);
    for (int i = 0; i < N; ++i)
        for (int j = 0; j < N; ++j)
            testN(rng[i], rng[j]);
    self_reference_test();
}