libcxx/test/std/algorithms/alg.sorting/alg.lex.comparison/lexicographical_compare.pass.cpp

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

// <algorithm>

// template<InputIterator Iter1, InputIterator Iter2>
//   requires HasLess<Iter1::value_type, Iter2::value_type>
//         && HasLess<Iter2::value_type, Iter1::value_type>
//   bool
//   lexicographical_compare(Iter1 first1, Iter1 last1, Iter2 first2, Iter2 last2);

#include <algorithm>
#include <cassert>

#include "test_iterators.h"

template <class Iter1, class Iter2>
void
test()
{
    int ia[] = {1, 2, 3, 4};
    const unsigned sa = sizeof(ia)/sizeof(ia[0]);
    int ib[] = {1, 2, 3};
    assert(!std::lexicographical_compare(Iter1(ia),   Iter1(ia+sa), Iter2(ib),   Iter2(ib+2)));
    assert( std::lexicographical_compare(Iter1(ib),   Iter1(ib+2),  Iter2(ia),   Iter2(ia+sa)));
    assert(!std::lexicographical_compare(Iter1(ia),   Iter1(ia+sa), Iter2(ib),   Iter2(ib+3)));
    assert( std::lexicographical_compare(Iter1(ib),   Iter1(ib+3),  Iter2(ia),   Iter2(ia+sa)));
    assert( std::lexicographical_compare(Iter1(ia),   Iter1(ia+sa), Iter2(ib+1), Iter2(ib+3)));
    assert(!std::lexicographical_compare(Iter1(ib+1), Iter1(ib+3),  Iter2(ia),   Iter2(ia+sa)));
}

int main()
{
    test<input_iterator<const int*>, input_iterator<const int*> >();
    test<input_iterator<const int*>, forward_iterator<const int*> >();
    test<input_iterator<const int*>, bidirectional_iterator<const int*> >();
    test<input_iterator<const int*>, random_access_iterator<const int*> >();
    test<input_iterator<const int*>, const int*>();

    test<forward_iterator<const int*>, input_iterator<const int*> >();
    test<forward_iterator<const int*>, forward_iterator<const int*> >();
    test<forward_iterator<const int*>, bidirectional_iterator<const int*> >();
    test<forward_iterator<const int*>, random_access_iterator<const int*> >();
    test<forward_iterator<const int*>, const int*>();

    test<bidirectional_iterator<const int*>, input_iterator<const int*> >();
    test<bidirectional_iterator<const int*>, forward_iterator<const int*> >();
    test<bidirectional_iterator<const int*>, bidirectional_iterator<const int*> >();
    test<bidirectional_iterator<const int*>, random_access_iterator<const int*> >();
    test<bidirectional_iterator<const int*>, const int*>();

    test<random_access_iterator<const int*>, input_iterator<const int*> >();
    test<random_access_iterator<const int*>, forward_iterator<const int*> >();
    test<random_access_iterator<const int*>, bidirectional_iterator<const int*> >();
    test<random_access_iterator<const int*>, random_access_iterator<const int*> >();
    test<random_access_iterator<const int*>, const int*>();

    test<const int*, input_iterator<const int*> >();
    test<const int*, forward_iterator<const int*> >();
    test<const int*, bidirectional_iterator<const int*> >();
    test<const int*, random_access_iterator<const int*> >();
    test<const int*, const int*>();
}