25.set.sym.difference.cpp

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#include <algorithm>    // for set_symmetric_difference 
#include <cstddef>      // for size_t
 
#include <rw_alg_test.h>
#include <rw_value.h>   // for UserClass
#include <rw_driver.h>  // for rw_test()
 
 
_RWSTD_NAMESPACE (std) { 
 
// disable explicit instantiation for compilers (like MSVC)
// that can't handle it
#ifndef _RWSTD_NO_EXPLICIT_INSTANTIATION
 
template 
OutputIter<lt_comp<assign<base<cpy_ctor> > > >
set_symmetric_difference (InputIter<lt_comp<assign<base<cpy_ctor> > > >,
                          InputIter<lt_comp<assign<base<cpy_ctor> > > >,
                          InputIter<lt_comp<assign<base<cpy_ctor> > > >,
                          InputIter<lt_comp<assign<base<cpy_ctor> > > >,
                          OutputIter<lt_comp<assign<base<cpy_ctor> > > >);
 
template 
OutputIter<lt_comp<assign<base<cpy_ctor> > > >
set_symmetric_difference (InputIter<lt_comp<assign<base<cpy_ctor> > > >,
                          InputIter<lt_comp<assign<base<cpy_ctor> > > >,
                          InputIter<lt_comp<assign<base<cpy_ctor> > > >,  
                          InputIter<lt_comp<assign<base<cpy_ctor> > > >,
                          OutputIter<lt_comp<assign<base<cpy_ctor> > > >,
                        binary_predicate<lt_comp<assign<base<cpy_ctor> > > >);
 
#endif // _RWSTD_NO_EXPLICIT_INSTANTIATION
 
}   // namespace std
 
 
struct Less
{
    static std::size_t funcalls_;
 
    // dummy arguments provided to prevent the class from being
    // default constructible and implicit conversion from int
    Less (int /* dummy */, int /* dummy */) {
        funcalls_ = 0;
    }
 
    // return a type other than bool but one that is implicitly
    // convertible to bool to detect incorrect assumptions
    conv_to_bool operator() (const UserClass &x,
                             const UserClass &y) /* non-const */ {
        ++funcalls_;
        return conv_to_bool::make (x.data_.val_ < y.data_.val_);
    }
 
private:
    void operator= (Less&);   // not assignable
};
 
std::size_t Less::funcalls_;
 
 
struct SetSymDifferenceBase
{
    virtual ~SetSymDifferenceBase() {}
 
    const char* iter_names [3];
 
    // ipure virtual
    virtual UserClass*
    set_sym_difference (const UserClass*, const UserClass*, const UserClass*,
                        const UserClass*, UserClass*, UserClass*,
                        const Less*) const = 0;
};
 
template <class InputIterator1, class InputIterator2, class OutputIterator>
struct SetSymDifference: SetSymDifferenceBase
{
    SetSymDifference () {
        iter_names [0] = type_name (InputIterator1 (0, 0, 0), (UserClass*)0);
        iter_names [1] = type_name (InputIterator2 (0, 0, 0), (UserClass*)0);
        iter_names [2] = type_name (OutputIterator (0, 0, 0), (UserClass*)0);
    }
 
    virtual ~SetSymDifference() {}
 
    virtual UserClass*
    set_sym_difference (const UserClass    *xsrc1, const UserClass *xsrc1_end,
                        const UserClass    *xsrc2, const UserClass *xsrc2_end,
                        UserClass          *xdst, UserClass *xdst_end,
                        const Less *ppred) const {
 
        const InputIterator1 first1 (xsrc1,     xsrc1, xsrc1_end);
        const InputIterator1 last1  (xsrc1_end, xsrc1, xsrc1_end);
        const InputIterator2 first2 (xsrc2,     xsrc2, xsrc2_end);
        const InputIterator2 last2  (xsrc2_end, xsrc2, xsrc2_end);
 
        const OutputIterator result (xdst, xdst, xdst_end);
 
        const OutputIterator ret = ppred ?
            std::set_symmetric_difference (first1, last1, first2, last2, 
                                           result, *ppred)
          : std::set_symmetric_difference (first1, last1, first2, last2, 
                                           result);
 
        // silence EDG eccp 3.7 and prior remark #550-D:
        //   variable was set but never used
        _RWSTD_UNUSED (ret);
 
        return ret.cur_;
    }
};
 
 
// exercises set_difference: 25.3.5.5
void test_set_sym_difference (int                         line,
                              const char                 *src1,
                              std::size_t                 nsrc1,
                              const char                 *src2,
                              std::size_t                 nsrc2,
                              const char                 *res,
                              std::size_t                 ndst,
                              const std::size_t           nf,
                              bool                        predicate,
                              const SetSymDifferenceBase &alg)
{
    const char* const it1name = alg.iter_names [0];
    const char* const it2name = alg.iter_names [1];
    const char* const outname = alg.iter_names [2];
    const char* const algname = "set_symmetric_difference";
    const char* const funname = predicate ? "Less" : 0;
 
    UserClass* const xsrc1 = UserClass::from_char (src1, nsrc1,
                                                   true /* must be sorted */);
    UserClass* const xsrc2 = UserClass::from_char (src2, nsrc2,
                                                   true /* must be sorted */);
    UserClass* const xdst  = new UserClass [ndst];
 
    // source sequences must be sorted
    RW_ASSERT (0 == nsrc1 || 0 != xsrc1);
    RW_ASSERT (0 == nsrc2 || 0 != xsrc2);
 
    const int max1_id = nsrc1 > 0 ? xsrc1 [nsrc1 - 1].id_ : -1;
 
    UserClass* const xsrc1_end = xsrc1 + nsrc1;
    UserClass* const xsrc2_end = xsrc2 + nsrc2;
    UserClass* const xdst_end  = xdst + ndst;
 
    const std::size_t last_n_op_lt = UserClass::n_total_op_lt_;
 
    const Less pred (0, 0);
    const Less* const ppred = predicate ? &pred : 0;
 
    UserClass* xdst_res = alg.set_sym_difference (xsrc1, xsrc1_end,
                                          xsrc2, xsrc2_end, 
                                          xdst, xdst_end, ppred);
 
    // check the returned value
    bool success = xdst_res == xdst_end;
    rw_assert (success, 0, line,
               "line %d: %s<%s, %s, %s%{?}, %s%{;}> (\"%s\", \"%s\", ...) "
               "got res + %td, expected res + %zu", 
               __LINE__, algname, it1name, it2name, outname, predicate, 
               funname, src1, src2, xdst_res - xdst, ndst);
 
    //quit here to avoid the running out of the array boundaries
    if (! success) {    
        delete[] xsrc1;
        delete[] xsrc2;
        delete[] xdst;
        return;
    }
 
    std::size_t n_ops_lt = ppred ? 
        Less::funcalls_ : UserClass::n_total_op_lt_ - last_n_op_lt;
 
    // verify the algorithm correctness
    std::size_t i = 0;
    std::size_t n1 = 0;
    std::size_t n2 = 0;
    for ( ; i < ndst; i++) {
        xdst [i].origin_ <= max1_id ? n1++ : n2++;
        success = xdst [i].data_.val_ == res [i];
        if (!success)
            break;
    }
 
    // to avoid errors in --trace mode
    i = i < ndst ? i : ndst - 1;
 
    static const int cwidth = sizeof (*xdst);
 
    rw_assert (success, 0, line,
               "line %d: %s<%s, %s, %s%{?}, %s%{;}> (\"%s\", \"%s\", ...) "
               " ==> \"%{X=*.*}\", expected \"%s\"", 
               __LINE__, algname, it1name, it2name, outname, predicate, 
               funname, src1, src2, cwidth, int (ndst), i, xdst, res);
 
    // verfiy that only elements from first sequence sequence were taken
    success = n1 == nf;
    rw_assert (success, 0, line,
               "line %d: %s<%s, %s, %s%{?}, %s%{;}> (\"%s\", \"%s\", ...) "
               " ==> \"%{X=*.*}\" got %zu elements from first sequence and "
               "%zu from second, expected %zu from first and %zu from second",
               __LINE__, algname, it1name, it2name, outname, predicate,
               funname, src1, src2,
               cwidth, int (ndst), -1, xdst, n1, n2, nf, ndst - nf);
 
    // verify that the operation is stable: two equal elements
    // should go in the same order
    for (i = 1; i < ndst; i++) {
        if (xdst [i - 1].data_.val_ == xdst [i].data_.val_) {
            success = xdst [i - 1].origin_ < xdst [i].origin_;
            if (!success)
                break;
        }
    }
 
    // to avoid errors in --trace mode
    if (ndst > 1) {
        i = i < ndst ? i : ndst - 1;
 
        rw_assert (success, 0, line,
                   "line %d: %s<%s, %s, %s%{?}, %s%{;}> (\"%s\", \"%s\", ...)"
                   " ==> \"%{X=*.*}\" not stable : elements %#c==%#c have "
                   "ids %d >= %d ",
                   __LINE__, algname, it1name, it2name, outname, predicate, 
                   funname, src1, src2, cwidth, int (ndst), i, xdst,
                   xdst[i - 1].data_.val_, xdst[i].data_.val_,
                   xdst[i - 1].origin_, xdst[i].origin_);
    }
 
    // verify the complexity
    std::size_t n_exp_ops = nsrc1 + nsrc2 > 0 ? 2 * (nsrc1 + nsrc2) - 1 : 0;
    rw_assert (n_ops_lt <= n_exp_ops, 0, line,
               "line %d: %s<%s, %s, %s%{?}, %s%{;}> (\"%s\", \"%s\", ...) "
               "complexity: got %zu, expected no more than %zu",
               __LINE__, algname, it1name, it2name, outname, predicate,
               funname, src1, src2, n_ops_lt, n_exp_ops);
 
    delete[] xsrc1;
    delete[] xsrc2;
    delete[] xdst;
}
 
 
void test_set_sym_difference (const SetSymDifferenceBase &alg, 
                              bool                        predicate)
{
    const char* const it1name = alg.iter_names [0];
    const char* const it2name = alg.iter_names [1];
    const char* const outname = alg.iter_names [2];
    const char* const algname = "set_symmetric_difference";
    const char* const funname = predicate ? "Less" : 0;
 
    rw_info (0, 0, 0,
             "%s std::%s(%s, %3$s, %s, %4$s, %1$s%{?}, %s%{;})",
             outname, algname, it1name, it2name, predicate, funname);
 
#define TEST(src1, src2, res, nf)                               \
    test_set_sym_difference (__LINE__, src1, sizeof src1 -1,    \
                             src2, sizeof src2 - 1,             \
                             res, sizeof res - 1,               \
                             nf, predicate, alg)  
 
    //    +------------------------------ first set
    //    |        +--------------------- second set
    //    |        |        +------------ symmetric difference between them
    //    |        |        |         +-- number of elements from the first
    //    |        |        |         |   sequence copied to the result
    //    V        V        V         V
    TEST ("a",     "",      "a",      1);
    TEST ("abcde", "",      "abcde",  5);
    TEST ("",      "a",     "a",      0);
    TEST ("",      "abcde", "abcde",  0);
    TEST ("a",     "b",     "ab",     1);
    TEST ("b",     "a",     "ab",     1);
    TEST ("aa",    "aa",    "",       0);
    TEST ("ab",    "ab",    "",       0);
    TEST ("aa",    "ab",    "ab",     1);
    TEST ("aa",    "bb",    "aabb",   2);
    TEST ("ab",    "bb",    "ab",     1);
    TEST ("ac",    "bb",    "abbc",   2);
    TEST ("ace",   "bdf",   "abcdef", 3);
    TEST ("acf",   "bdf",   "abcd",   2);
    TEST ("ade",   "bdf",   "abef",   2);
    TEST ("bce",   "bdf",   "cdef",   2);
    TEST ("aacee", "aacee", "",       0);
    TEST ("aacee", "aaace", "ae",     1);
    TEST ("aacee", "aaaae", "aace",   2);
    TEST ("aacee", "aaaaa", "aaacee", 3);
    TEST ("aacee", "aaabd", "abcdee", 3);
    TEST ("aacee", "aabee", "bc",     1);
    TEST ("aaaaa", "aaaaa", "",       0);
    TEST ("aaaaa", "aaaa", "a",       1);
    TEST ("aaaaa", "aaa", "aa",       2);
    TEST ("aaaaa", "aa", "aaa",       3);
    TEST ("aaaaa", "a", "aaaa",       4);
}
 
 
/* extern */ int rw_opt_no_predicate;           // --no-predicate
/* extern */ int rw_opt_no_input_iter;          // --no-InputIterator
/* extern */ int rw_opt_no_output_iter;         // --no-OutputIterator
/* 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
 
 
template <class InputIterator1, class InputIterator2, class OutputIterator>
void gen_set_sym_difference_test (const InputIterator1&,
                                  const InputIterator2&,
                                  const OutputIterator&,
                                  bool predicate)
{
    const SetSymDifference<
            InputIterator1, InputIterator2, OutputIterator> alg;
 
    test_set_sym_difference (alg, predicate);
}
 
 
template <class InputIterator1, class InputIterator2>
void gen_set_sym_difference_test (const InputIterator1 &it1,
                                  const InputIterator2 &it2,
                                  bool predicate)
{
    if (0 == rw_opt_no_output_iter)
        gen_set_sym_difference_test (
            it1, it2, OutputIter<UserClass>(0, 0, 0), predicate);
    if (0 == rw_opt_no_fwd_iter)
        gen_set_sym_difference_test (
            it1, it2, FwdIter<UserClass>(0, 0, 0), predicate);
    if (0 == rw_opt_no_bidir_iter)
        gen_set_sym_difference_test (
            it1, it2, BidirIter<UserClass>(0, 0, 0), predicate);
    if (0 == rw_opt_no_rnd_iter)
        gen_set_sym_difference_test (
            it1, it2, RandomAccessIter<UserClass>(0, 0, 0), predicate);
}
 
template <class InputIterator1>
void gen_set_sym_difference_test (const InputIterator1 &it1, 
                                  bool                  predicate)
{
    if (0 == rw_opt_no_input_iter)
        gen_set_sym_difference_test (
            it1, InputIter<UserClass>(0, 0, 0), predicate);
    if (0 == rw_opt_no_fwd_iter)
        gen_set_sym_difference_test (
            it1, ConstFwdIter<UserClass>(0, 0, 0), predicate);
    if (0 == rw_opt_no_bidir_iter)
        gen_set_sym_difference_test (
            it1, ConstBidirIter<UserClass>(0, 0, 0), predicate);
    if (0 == rw_opt_no_rnd_iter)
        gen_set_sym_difference_test (
            it1, ConstRandomAccessIter<UserClass>(0, 0, 0), predicate);
}
 
// generates a specialization of the set_union test for each of the required
// iterator categopries
void gen_set_sym_difference_test (bool predicate)
{
    rw_info (0, 0, 0,
             "template <class %s, class %s, class %s%{?}, class %s%{;}> %3$s "
             "set_symmetric_difference (%1$s, %1$s, %2$s, %2$s, "
             "%3$s%{?}, %s%{;})",
             "InputIterator1", "InputIterator2", "OutputIterator",
             predicate, "Compare", predicate, "Compare");
 
    if (rw_opt_no_output_iter)
        rw_note (0, 0, 0, "OutputIterator test disabled");
 
    if (rw_opt_no_input_iter)
        rw_note (0, 0, 0, "InputIterator test disabled");
    else
        gen_set_sym_difference_test (InputIter<UserClass>(0, 0, 0), predicate);
 
    if (rw_opt_no_fwd_iter)
        rw_note (0, 0, 0, "ForwardIterator test disabled");
    else
        gen_set_sym_difference_test (ConstFwdIter<UserClass>(0, 0, 0),
                                     predicate);
 
    if (rw_opt_no_bidir_iter)
        rw_note (0, 0, 0, "BidirectionalIterator test disabled");
    else
        gen_set_sym_difference_test (ConstBidirIter<UserClass>(0, 0, 0),
                                     predicate);
 
    if (rw_opt_no_rnd_iter)
        rw_note (0, 0, 0, "RandomAccessIterator test disabled");
    else
        gen_set_sym_difference_test (
            ConstRandomAccessIter<UserClass>(0, 0, 0), predicate);
}
 
 
static int run_test (int, char*[])
{
    if (rw_opt_no_predicate)
        rw_note (0, 0, 0, "predicate test disabled");
 
    const int niters = rw_opt_no_predicate ? 1 : 2;
 
    for (int i = 0; i != niters; ++i) {
        gen_set_sym_difference_test (1 == i);
    }
 
    return 0;
}
 
 
int main (int argc, char *argv[])
{
    return rw_test (argc, argv, __FILE__,
                    "lib.set.symmetric.difference",
                    0 /* no comment */, run_test,
                    "|-no-predicate#"
                    "|-no-InputIterator# "
                    "|-no-OutputIterator# "
                    "|-no-ForwardIterator# "
                    "|-no-BidirectionalIterator# "
                    "|-no-RandomAccessIterator#",
                    &rw_opt_no_predicate,
                    &rw_opt_no_input_iter,
                    &rw_opt_no_output_iter,
                    &rw_opt_no_fwd_iter,
                    &rw_opt_no_bidir_iter,
                    &rw_opt_no_rnd_iter);
}