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inclusive_scan_op_init.pass.cpp (3798B)


      1 //===----------------------------------------------------------------------===//
      2 //
      3 //                     The LLVM Compiler Infrastructure
      4 //
      5 // This file is dual licensed under the MIT and the University of Illinois Open
      6 // Source Licenses. See LICENSE.TXT for details.
      7 //
      8 //===----------------------------------------------------------------------===//
      9 
     10 // <numeric>
     11 // UNSUPPORTED: c++98, c++03, c++11, c++14
     12 
     13 // template<class InputIterator, class OutputIterator, class T, class BinaryOperation>
     14 //     OutputIterator
     15 //     inclusive_scan(InputIterator first, InputIterator last,
     16 //                    OutputIterator result,
     17 //                    BinaryOperation binary_op, T init); // C++17
     18 
     19 #include <numeric>
     20 #include <algorithm>
     21 #include <cassert>
     22 #include <functional>
     23 #include <iterator>
     24 #include <vector>
     25 
     26 #include "test_iterators.h"
     27 
     28 template <class Iter1, class T, class Op, class Iter2>
     29 void
     30 test(Iter1 first, Iter1 last, Op op, T init, Iter2 rFirst, Iter2 rLast)
     31 {
     32     std::vector<typename std::iterator_traits<Iter1>::value_type> v;
     33 
     34 //  Not in place
     35     std::inclusive_scan(first, last, std::back_inserter(v), op, init);
     36     assert(std::equal(v.begin(), v.end(), rFirst, rLast));
     37 
     38 //  In place
     39     v.clear();
     40     v.assign(first, last);
     41     std::inclusive_scan(v.begin(), v.end(), v.begin(), op, init);
     42     assert(std::equal(v.begin(), v.end(), rFirst, rLast));
     43 }
     44 
     45 
     46 template <class Iter>
     47 void
     48 test()
     49 {
     50           int ia[]   = {1, 3,  5,   7,   9};
     51     const int pRes[] = {1, 4,  9,  16,  25};
     52     const int mRes[] = {1, 3, 15, 105, 945};
     53     const unsigned sa = sizeof(ia) / sizeof(ia[0]);
     54     static_assert(sa == sizeof(pRes) / sizeof(pRes[0]));       // just to be sure
     55     static_assert(sa == sizeof(mRes) / sizeof(mRes[0]));       // just to be sure
     56 
     57     for (unsigned int i = 0; i < sa; ++i ) {
     58         test(Iter(ia), Iter(ia + i), std::plus<>(),       0, pRes, pRes + i);
     59         test(Iter(ia), Iter(ia + i), std::multiplies<>(), 1, mRes, mRes + i);
     60         }
     61 }
     62 
     63 size_t triangle(size_t n) { return n*(n+1)/2; }
     64 
     65 //  Basic sanity
     66 void basic_tests()
     67 {
     68     {
     69     std::vector<size_t> v(10);
     70     std::fill(v.begin(), v.end(), 3);
     71     std::inclusive_scan(v.begin(), v.end(), v.begin(), std::plus<>(), size_t{50});
     72     for (size_t i = 0; i < v.size(); ++i)
     73         assert(v[i] == 50 + (i+1) * 3);
     74     }
     75 
     76     {
     77     std::vector<size_t> v(10);
     78     std::iota(v.begin(), v.end(), 0);
     79     std::inclusive_scan(v.begin(), v.end(), v.begin(), std::plus<>(), size_t{40});
     80     for (size_t i = 0; i < v.size(); ++i)
     81         assert(v[i] == 40 + triangle(i));
     82     }
     83 
     84     {
     85     std::vector<size_t> v(10);
     86     std::iota(v.begin(), v.end(), 1);
     87     std::inclusive_scan(v.begin(), v.end(), v.begin(), std::plus<>(), size_t{30});
     88     for (size_t i = 0; i < v.size(); ++i)
     89         assert(v[i] == 30 + triangle(i + 1));
     90     }
     91 
     92     {
     93     std::vector<size_t> v, res;
     94     std::inclusive_scan(v.begin(), v.end(), std::back_inserter(res), std::plus<>(), size_t{40});
     95     assert(res.empty());
     96     }
     97 
     98 //  Make sure that the calculations are done using the init typedef
     99     {
    100     std::vector<unsigned char> v(10);
    101     std::iota(v.begin(), v.end(), static_cast<unsigned char>(1));
    102     std::vector<size_t> res;
    103     std::inclusive_scan(v.begin(), v.end(), std::back_inserter(res), std::multiplies<>(), size_t{1});
    104 
    105     assert(res.size() == 10);
    106     size_t j = 1;
    107     assert(res[0] == 1);
    108     for (size_t i = 1; i < v.size(); ++i)
    109     {
    110         j *= i + 1;
    111         assert(res[i] == j);
    112     }
    113     }
    114 }
    115 
    116 
    117 int main()
    118 {
    119 
    120     basic_tests();
    121 
    122 //  All the iterator categories
    123     test<input_iterator        <const int*> >();
    124     test<forward_iterator      <const int*> >();
    125     test<bidirectional_iterator<const int*> >();
    126     test<random_access_iterator<const int*> >();
    127     test<const int*>();
    128     test<      int*>();
    129 
    130 }