314 lines
9.7 KiB
C++
314 lines
9.7 KiB
C++
/***************************************************************************
|
|
*
|
|
* 25.nth.element.cpp - test exercising 25.3.2 [lib.alg.nth.element]
|
|
*
|
|
* $Id: 25.nth.element.cpp 510970 2007-02-23 14:57:45Z faridz $
|
|
*
|
|
***************************************************************************
|
|
*
|
|
* Licensed to the Apache Software Foundation (ASF) under one or more
|
|
* contributor license agreements. See the NOTICE file distributed
|
|
* with this work for additional information regarding copyright
|
|
* ownership. The ASF licenses this file to you under the Apache
|
|
* License, Version 2.0 (the "License"); you may not use this file
|
|
* except in compliance with the License. You may obtain a copy of
|
|
* the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
|
|
* implied. See the License for the specific language governing
|
|
* permissions and limitations under the License.
|
|
*
|
|
* Copyright 1994-2006 Rogue Wave Software.
|
|
*
|
|
**************************************************************************/
|
|
|
|
#include <algorithm> // for nth_element,
|
|
#include <cstring> // for strlen, size_t
|
|
|
|
#include <alg_test.h>
|
|
#include <rw_value.h> // for UserClass
|
|
#include <driver.h> // for rw_test()
|
|
|
|
/**************************************************************************/
|
|
|
|
_RWSTD_NAMESPACE (std) {
|
|
|
|
#ifndef _RWSTD_NO_EXPLICIT_INSTANTIATION
|
|
|
|
template
|
|
void
|
|
nth_element (RandomAccessIter<lt_comp<assign<base<cpy_ctor> > > >,
|
|
RandomAccessIter<lt_comp<assign<base<cpy_ctor> > > >,
|
|
RandomAccessIter<lt_comp<assign<base<cpy_ctor> > > >);
|
|
|
|
template
|
|
void
|
|
nth_element (RandomAccessIter<lt_comp<assign<base<cpy_ctor> > > >,
|
|
RandomAccessIter<lt_comp<assign<base<cpy_ctor> > > >,
|
|
RandomAccessIter<lt_comp<assign<base<cpy_ctor> > > >,
|
|
binary_predicate<lt_comp<assign<base<cpy_ctor> > > >);
|
|
|
|
#endif // _RWSTD_NO_EXPLICIT_INSTANTIATION
|
|
|
|
} // namespace std
|
|
|
|
/**************************************************************************/
|
|
|
|
template <class T>
|
|
struct StrictWeakLess
|
|
{
|
|
static std::size_t funcalls_;
|
|
|
|
// dummy arguments provided to prevent the class from being
|
|
// default constructible and implicit conversion from int
|
|
StrictWeakLess (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 T &x, const T &y) /* non-const */ {
|
|
++funcalls_;
|
|
return conv_to_bool::make (x.data_.val_ < y.data_.val_);
|
|
}
|
|
|
|
static const char* name () { return "StrictWeakLess"; }
|
|
|
|
private:
|
|
void operator= (StrictWeakLess&); // not assignable
|
|
};
|
|
|
|
template<class T>
|
|
std::size_t StrictWeakLess<T>::funcalls_;
|
|
|
|
/**************************************************************************/
|
|
|
|
// exrcises nth_element
|
|
template <class T, class Predicate>
|
|
void test_nth_element (int line,
|
|
const char *src,
|
|
const std::size_t N,
|
|
const std::size_t nth,
|
|
const T*,
|
|
const Predicate *ppred)
|
|
{
|
|
_RWSTD_UNUSED (ppred);
|
|
|
|
typedef RandomAccessIter<T> RandIter;
|
|
|
|
const RandIter it(0, 0, 0);
|
|
|
|
const char* const itname = type_name (it, (T*)0);
|
|
const char* const fname = "nth_element";
|
|
const char* const funname = Predicate::name();
|
|
|
|
const std::size_t nsrc = src ? std::strlen (src) : N;
|
|
|
|
T::gen_ = gen_rnd;
|
|
T* const xsrc = src ? T::from_char (src, nsrc) : new T[nsrc];
|
|
|
|
T* const xsrc_end = xsrc + nsrc;
|
|
|
|
// current, first, last
|
|
const RandIter first = make_iter (xsrc, xsrc, xsrc_end, it);
|
|
const RandIter nth_it = make_iter (xsrc + nth, xsrc, xsrc_end, it);
|
|
const RandIter last = make_iter (xsrc_end, xsrc, xsrc_end, it);
|
|
|
|
Predicate pred (0, 0);
|
|
|
|
const std::size_t last_n_op_lt = T::n_total_op_lt_;
|
|
|
|
if (ppred)
|
|
std::nth_element (first, nth_it, last, pred);
|
|
else
|
|
std::nth_element (first, nth_it, last);
|
|
|
|
// check the results, 25.3.2, p1
|
|
bool success = true;
|
|
std::size_t i = 0;
|
|
std::size_t j = 0;
|
|
|
|
for (i = 0; i < nth; i++) {
|
|
for (j = nth; j < nsrc; j++) {
|
|
success = xsrc[i].data_.val_ <= xsrc[j].data_.val_;
|
|
if (!success)
|
|
break;
|
|
}
|
|
|
|
if (!success)
|
|
break;
|
|
}
|
|
|
|
// to avoid errors in --trace mode
|
|
i = i < nth ? i : nth - 1;
|
|
j = j < nsrc ? j : nsrc - 1;
|
|
|
|
if (src) {
|
|
rw_assert (success, 0, line,
|
|
"line %d: %s<%s%{?}, %s%{;}>(\"%s\", %zu, ...) ==> "
|
|
"\"%{X=*.*}\", got %#c at %zu !< %#c at %zu",
|
|
__LINE__, fname, itname, ppred, funname, src, nth,
|
|
int (nsrc), -1, xsrc, xsrc[i].data_.val_, i,
|
|
xsrc[j].data_.val_, j);
|
|
}
|
|
else {
|
|
rw_assert (success, 0, line,
|
|
"line %d: %s<%s%{?}, %s%{;}>(%zu, %zu, ...) "
|
|
"got %d at %zu !< %d at %zu",
|
|
__LINE__, fname, itname, ppred, funname, N, nth,
|
|
xsrc[i].data_.val_, i, xsrc[j].data_.val_, j);
|
|
}
|
|
|
|
// check the complexity, 25.3.2, p2
|
|
// it should be linear, i.e. <= K * N, there K << N
|
|
// after tests on random sequences use K == 8 as upper bound
|
|
std::size_t n_ops =
|
|
ppred ? Predicate::funcalls_ : T::n_total_op_lt_ - last_n_op_lt;
|
|
std::size_t exp_ops = 8 * nsrc;
|
|
|
|
success = n_ops <= exp_ops;
|
|
|
|
rw_assert (success, 0, line,
|
|
"line %d: %s<%s%{?}, %s%{;}>(%{?}\"%s\"%{;}%{?}%zu%{;}, "
|
|
"%zu, ...): complexity: got %zu, expected no more than %zu",
|
|
__LINE__, fname, itname, ppred, funname,
|
|
src, src, !src, N, nth, n_ops, exp_ops);
|
|
|
|
delete[] xsrc;
|
|
}
|
|
|
|
/**************************************************************************/
|
|
|
|
/* extern */ int rw_opt_nloops = 256; // --nloops=#
|
|
/* extern */ int rw_opt_no_predicate; // --no-predicate
|
|
/* extern */ int rw_opt_no_complexity; // --no-complexity
|
|
|
|
/**************************************************************************/
|
|
|
|
template <class T, class Predicate>
|
|
void test_nth_element (const T*,
|
|
const Predicate *ppred)
|
|
{
|
|
typedef RandomAccessIter<T> RandIter;
|
|
|
|
const char* const itname = type_name (RandIter (0, 0, 0), (T*)0);
|
|
const char* const fname = "nth_element";
|
|
const char* const funname = Predicate::name();
|
|
|
|
rw_info (0, 0, 0,
|
|
"std::%s (%s, %2$s, %2$s%{?}, %s%{;})",
|
|
fname, itname, ppred, funname);
|
|
|
|
#define TEST(src, nth) \
|
|
test_nth_element (__LINE__, src, 0, nth, (T*)0, ppred)
|
|
|
|
TEST ("a", 0);
|
|
TEST ("aa", 1);
|
|
TEST ("ab", 0);
|
|
|
|
TEST ("jihgfedcba", 0);
|
|
TEST ("jihgfedcba", 1);
|
|
TEST ("jihgfedcba", 2);
|
|
TEST ("jihgfedcba", 3);
|
|
TEST ("jihgfedcba", 4);
|
|
TEST ("jihgfedcba", 5);
|
|
TEST ("jihgfedcba", 6);
|
|
TEST ("jihgfedcba", 7);
|
|
TEST ("jihgfedcba", 8);
|
|
TEST ("jihgfedcba", 9);
|
|
|
|
TEST ("abcdefghij", 0);
|
|
TEST ("abcdefghij", 1);
|
|
TEST ("abcdefghij", 2);
|
|
TEST ("abcdefghij", 3);
|
|
TEST ("abcdefghij", 4);
|
|
TEST ("abcdefghij", 5);
|
|
TEST ("abcdefghij", 6);
|
|
TEST ("abcdefghij", 7);
|
|
TEST ("abcdefghij", 8);
|
|
TEST ("abcdefghij", 9);
|
|
|
|
TEST ("jijgfgdcda", 5);
|
|
TEST ("jihifefcbc", 5);
|
|
TEST ("jiigffdcca", 5);
|
|
TEST ("jihhfeecbb", 5);
|
|
|
|
TEST ("cbbbbbbbba", 5);
|
|
TEST ("ccbbbbbbaa", 5);
|
|
|
|
TEST ("abadedghgj", 5);
|
|
TEST ("abcbefehih", 5);
|
|
TEST ("abbdeeghhj", 5);
|
|
TEST ("abcceffhii", 5);
|
|
|
|
TEST ("abbbbbbbbc", 5);
|
|
TEST ("aabbbbbbcc", 5);
|
|
|
|
#undef TEST
|
|
|
|
if (rw_opt_no_complexity) {
|
|
rw_note (0, 0, 0,
|
|
"std::%s (%s, %2$s, %2$s%{?}, %s%{;}): "
|
|
"complexity test disabled",
|
|
fname, itname, ppred, funname);
|
|
}
|
|
else {
|
|
rw_info (0, 0, 0,
|
|
"std::%s (%s, %2$s, %2$s%{?}, %s%{;}): complexity test",
|
|
fname, itname, ppred, funname);
|
|
|
|
const std::size_t N = std::size_t (rw_opt_nloops);
|
|
for (std::size_t i = 1; i < N; i++)
|
|
test_nth_element (__LINE__, 0, i, i / 2, (T*)0, ppred);
|
|
}
|
|
}
|
|
|
|
/**************************************************************************/
|
|
|
|
static int run_test (int, char*[])
|
|
{
|
|
rw_info (0, 0, 0,
|
|
"template <class %s> "
|
|
"void std::nth_element (%1$s, %1$s, %1$s)",
|
|
"RandomAccessIterator");
|
|
|
|
test_nth_element ((UserClass*)0, (StrictWeakLess<UserClass>*)0);
|
|
|
|
if (rw_opt_no_predicate) {
|
|
rw_note (0, __FILE__, __LINE__,
|
|
"std::nth_element predicate test disabled");
|
|
}
|
|
else {
|
|
rw_info (0, 0, 0,
|
|
"template <class %s, class %s> "
|
|
"void std::nth_element (%1$s, %1$s, %1$s, %2$s)",
|
|
"RandomAccessIterator", "StrictWeakLess");
|
|
|
|
const StrictWeakLess<UserClass> pred(0, 0);
|
|
test_nth_element ((UserClass*)0, &pred);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/**************************************************************************/
|
|
|
|
int main (int argc, char *argv[])
|
|
{
|
|
return rw_test (argc, argv, __FILE__,
|
|
"lib.alg.nth_element",
|
|
0 /* no comment */,
|
|
run_test,
|
|
"|-nloops#0 " // must be non-negative
|
|
"|-no-predicate#"
|
|
"|-no-complexity",
|
|
&rw_opt_nloops,
|
|
&rw_opt_no_predicate,
|
|
&rw_opt_no_complexity);
|
|
}
|