25.mismatch.cpp

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#include <algorithm>    // for mismatch
#include <functional>   // for equal_to
#include <cstddef>      // for size_t
 
#include <rw_alg_test.h>
#include <rw_value.h>   // for UserClass
#include <rw_driver.h>  // for rw_test()...
 
 
// exercises std::mismatch()
template <class InputIterator1, class InputIterator2, class T>
void test_mismatch (std::size_t           N,
                    const InputIterator1 &it1_dummy,
                    const InputIterator2 &it2_dummy,
                    T*,
                    const char           *predicate)
{
    static const char* const it1name = type_name (it1_dummy, (T*)0);
    static const char* const it2name = type_name (it2_dummy, (T*)0);
 
    rw_info (0, 0, 0, "std::mismatch (%s, %1$s, %s%{?}, %s%{;})",
             it1name, it2name, 0 != predicate, predicate);
 
    // generate sequential values for each default constructed UserClass
    // for both lists
    UserClass::gen_ = gen_seq_2lists;
 
    // use ::operator new() to prevent default initialization
    const std::size_t size = N * sizeof (UserClass);
    UserClass *buf1 = _RWSTD_STATIC_CAST (UserClass*, ::operator new (size));
    UserClass *buf2 = _RWSTD_STATIC_CAST (UserClass*, ::operator new (size));
 
    const std::size_t mid_inx = N / 2;
 
    for (std::size_t i = 0; i != N; ++i) {
 
        // default-construct a new UserClass at the end of the array
        new (buf1 + i) UserClass ();
 
        // build a nearly identical list only missing N/2 (the N/2th
        // element) from it's list
        if (i != mid_inx)
            new (buf2 + i) UserClass ();
    }
 
    new (buf2 + mid_inx) UserClass ();
 
    for (std::size_t i = 0; i != N; ++i) {
 
        // exercise 25.1.7 - std::mismatch<>()
        std::size_t last_n_op_eq  = UserClass::n_total_op_eq_;
 
        UserClass* const buf1_end = buf1 + i + 1;
        UserClass* const buf2_end = buf2 + i + 1;
 
        const InputIterator1 first1 (buf1, buf1, buf1_end);
        const InputIterator1 last1  (buf1_end, buf1_end, buf1_end);
        const InputIterator2 first2 (buf2, buf2, buf2_end);
 
        const std::equal_to<UserClass> pred = std::equal_to<UserClass>();
 
        const std::pair<InputIterator1, InputIterator2> result =
            predicate ? std::mismatch (first1, last1, first2, pred)
                      : std::mismatch (first1, last1, first2);
 
        // verify 25.1.7, p2
        UserClass* const expected_buf1_end = 
            (i < mid_inx) ? buf1_end : buf1 + mid_inx;
 
        UserClass* const expected_buf2_end = 
            (i < mid_inx) ? buf2_end : buf2 + mid_inx;
 
        UserClass* const res_buf1_end = 
            buf1 + (result.first.cur_ - first1.cur_);
 
        UserClass* const res_buf2_end = 
            buf2 + (result.second.cur_ - first2.cur_);
 
        // check that the returned iterators are valid
        bool success = 
            buf1 <= res_buf1_end && res_buf1_end <= buf1_end &&
            buf2 <= res_buf2_end && res_buf2_end <= buf2_end;
 
        rw_assert (success, 0, __LINE__, 
                   "%zu. mismatch (%s, %2$s, %s%{?}, %s%{;}): "
                   "result { %d, %d } out of range: expected "
                   "{ [0, %d], [0, %d] }",
                   i, it1name, it2name, 0 != predicate, predicate,
                   res_buf1_end - buf1, res_buf2_end - buf2,
                   buf1_end - buf1, buf2_end - buf2);
 
        // iterators are valid check that the algorithm works correctly
        success = 
               res_buf1_end->data_.val_ == expected_buf1_end->data_.val_
            && res_buf2_end->data_.val_ == expected_buf2_end->data_.val_;
 
        rw_assert (success, 0, __LINE__, 
                   "%zu. mismatch (%s, %2$s, %s%{?}, %s%{;}): "
                   "correctness: got: %d "
                   "expected: %d, got: %d expected: %d",
                   i, it1name, it2name, 0 != predicate, predicate,
                   res_buf1_end->data_.val_, expected_buf1_end->data_.val_,
                   res_buf2_end->data_.val_, expected_buf2_end->data_.val_);
 
        // verify 25.1.7, p3
        success = UserClass::n_total_op_eq_ - last_n_op_eq <= (N + 1);
 
        rw_assert (success, 0, __LINE__, 
                   "%zu. mismatch (%s, %2$s, %s%{?}, %s%{;}): "
                   "complexity: %zu <= %zu",
                   i, it1name, it2name, 0 != predicate, predicate,
                   UserClass::n_total_op_eq_, i + 1);
 
        if (!success)
            break;
    }
    
    ::operator delete (buf1);
    ::operator delete (buf2);
}
 
 
 
/* extern */ int rw_opt_nloops = 32;     // --nloops
/* extern */ int rw_opt_no_input_iter;   // --no-InputIterator
/* extern */ int rw_opt_no_fwd_iter;     // --no-ForwardIterator
/* extern */ int rw_opt_no_bidir_iter;   // --no-BidirectionalIterator
/* extern */ int rw_opt_no_rnd_iter;     // --no-RandomAccessIterator
/* extern */ int rw_opt_no_predicate;    // --no-Predicate
 
 
template <class InputIterator, class T>
void test_mismatch (const InputIterator &dummy, T*, const char *predicate)
{
    // check that the number of loops is non-negative
    rw_fatal (-1 < rw_opt_nloops, 0, 0,
              "number of loops must be non-negative, got %d",
              rw_opt_nloops);
 
    const std::size_t N = std::size_t (rw_opt_nloops);
 
    if (rw_opt_no_input_iter) {
        rw_note (0, __FILE__, __LINE__, "InputIterator test disabled");
    }
    else {
        test_mismatch (N, dummy, InputIter<UserClass>(0, 0, 0),
                       (UserClass*)0, predicate);
    }
 
    if (rw_opt_no_fwd_iter) {
        rw_note (0, __FILE__, __LINE__, "ForwardIterator test disabled");
    }
    else {
        test_mismatch (N, dummy, FwdIter<UserClass>(),
                       (UserClass*)0, predicate);
    }
 
    if (rw_opt_no_bidir_iter) {
        rw_note (0, __FILE__, __LINE__, 
            "BidirectionalIterator test disabled");
    }
    else {
        test_mismatch (N, dummy, BidirIter<UserClass>(),
                       (UserClass*)0, predicate);
    }
 
    if (rw_opt_no_rnd_iter) {
        rw_note (0, __FILE__, __LINE__, 
            "RandomAccessIterator test disabled");
    }
    else {
        test_mismatch (N, dummy, RandomAccessIter<UserClass>(),
                       (UserClass*)0, predicate);
    }
}
 
 
 
static void
test_mismatch (const char *predicate)
{
    rw_info (0, 0, 0,
             "template <class %s, class %s> "
             "std::pair<%1$s, %2$s> "
             "std::mismatch (%1$s, %1$s, %2$s%{?}, %s%{;})",
             "InputIterator1", "InputIterator2",
             0 != predicate, predicate);
 
    if (rw_opt_no_input_iter) {
        rw_note (0, __FILE__, __LINE__, "InputIterator test disabled");
    }
    else {
        test_mismatch (InputIter<UserClass>(0, 0, 0), (UserClass*)0, predicate);
    }
 
    if (rw_opt_no_fwd_iter) {
        rw_note (0, __FILE__, __LINE__, "ForwardIterator test disabled");
    }
    else {
        test_mismatch (ConstFwdIter<UserClass>(), (UserClass*)0, predicate);
        test_mismatch (FwdIter<UserClass>(), (UserClass*)0, predicate);
    }
 
    if (rw_opt_no_bidir_iter) {
        rw_note (0, __FILE__, __LINE__, 
            "BidirectionalIterator test disabled");
    }
    else {
        test_mismatch (ConstBidirIter<UserClass>(), (UserClass*)0, predicate);
        test_mismatch (BidirIter<UserClass>(), (UserClass*)0, predicate);
    }
 
    if (rw_opt_no_rnd_iter) {
        rw_note (0, __FILE__, __LINE__, 
            "RandomAccessIterator test disabled");
    }
    else {
        test_mismatch (ConstRandomAccessIter<UserClass>(),
                       (UserClass*)0, predicate);
        test_mismatch (RandomAccessIter<UserClass>(), (UserClass*)0, predicate);
    }
}
 
 
static int
run_test (int, char*[])
{
    test_mismatch (0);
 
    if (rw_opt_no_predicate) {
        rw_note (0, __FILE__, __LINE__, "Predicate test disabled");
    }
    else {
        test_mismatch ("std::equal_to<UserClass>");
    }
 
    return 0;
}
 
 
int main (int argc, char *argv[])
{
    return rw_test (argc, argv, __FILE__,
                    "lib.alg.mismatch",
                    0 /* no comment */, run_test,
                    "|-nloops#"
                    "|-no-InputIterator#"
                    "|-no-ForwardIterator#"
                    "|-no-BidirectionalIterator#"
                    "|-no-RandomAccessIterator#"
                    "|-no-Predicate",
                    &rw_opt_nloops,
                    &rw_opt_no_input_iter,
                    &rw_opt_no_fwd_iter,
                    &rw_opt_no_bidir_iter,
                    &rw_opt_no_rnd_iter,
                    &rw_opt_no_predicate);
}