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Jose Caban
2025-06-07 11:34:38 -04:00
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extern/stdcxx/4.2.1/tests/containers/23.vector.capacity.cpp vendored Normal file
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/***************************************************************************
*
* 23.vector.capacity.cpp - test exercising [lib.vector.capacity]
*
* $Id: 23.vector.capacity.cpp 510071 2007-02-21 15:58:53Z 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 2006 Rogue Wave Software.
*
**************************************************************************/
#include <stdexcept> // for length_error
#include <vector> // for vector
#include <alg_test.h>
#include <rw_value.h> // for UserClass
#include <driver.h>
/**************************************************************************/
static unsigned rw_opt_nloops = 1024;
static int rw_opt_no_exceptions;
/**************************************************************************/
typedef std::vector<UserClass, std::allocator<UserClass> > Vector;
// exercise vector<>::capacity() and vector<>::reserve()
// focus on the complexity of the function
void test_capacity (Vector::size_type nelems)
{
// create a vector with nelems elements
Vector v (nelems);
const Vector::size_type cap = v.capacity ();
const Vector::size_type size = v.size ();
Vector::const_pointer begin = size ? &v [0] : 0;
UserClass::reset_totals ();
// call reserve capacity that is less than or equal to the current value
v.reserve (cap / 2);
// verify that the call had no effect
rw_assert (v.capacity () == cap, 0, __LINE__,
"vector<UserClass>(%zu).reserve(%zu); capacity() == %zu, "
"got %zu", nelems, cap / 2, cap, v.capacity ());
if (size) {
// verify that no reallocation took place
rw_assert (begin == &v [0], 0, __LINE__,
"vector<UserClass>(%zu).reserve(%zu) unexpectedly "
"reallocated", nelems, cap / 2);
}
// call reserve the same capacity as the current value
v.reserve (cap);
// verify that the call had no effect
rw_assert (v.capacity () == cap, 0, __LINE__,
"vector<UserClass>(%zu).reserve(%zu); capacity() == %zu, "
"got %zu", nelems, cap / 2, cap, v.capacity ());
if (size) {
// verify that no reallocation took place
rw_assert (begin == &v [0], 0, __LINE__,
"vector<UserClass>(%zu).reserve(%zu) unexpectedly "
"reallocated", nelems, cap / 2);
}
// call reserve with a larger capacity then is available
v.reserve (cap + 1);
// 23.2.4.2, p2: After reserve (), capacity () is greater or equal
// to the reserve value if reallocation happens
rw_assert (v.capacity () >= cap + 1, 0, __LINE__,
"vector<UserClass>(%zu).reserve(%zu); capacity() > %zu, got %zu",
nelems, cap + 1, cap, v.capacity ());
// 23.2.3.2, p3: reserve shall not change the size of the sequence
rw_assert (v.size () == size, 0, __LINE__,
"vector<UserClass>(%zu).reserve(); size() == %zu, got %zu",
nelems, size, v.size ());
// 23.2.3.2, p3: takes at most linear time in the size of the sequence
rw_assert (UserClass::n_total_copy_ctor_ == v.size (), 0, __LINE__,
"vector<UserClass>(%zu).reserve(%zu) complexity: "
"copy ctor called %zu times when size() = %zu",
nelems, cap + 1, UserClass::n_total_copy_ctor_, v.size ());
if (size) {
begin = &v [0];
// verify 23.2.4.2, p5: no reallocation takes place until
// the size of the container would exceed its capacity
for (Vector::size_type i = 0; i != v.capacity () - size; ++i) {
v.push_back (UserClass ());
rw_assert (begin == &v [0], 0, __LINE__,
"vector<UserClass>(%zu).reserve(%zu); insertion of "
"element %zu unexpectedly reallocated; size() = %zu",
nelems, cap + 1, v.size ());
}
}
if (rw_opt_no_exceptions)
return;
#ifndef _RWSTD_NO_EXCEPTIONS
// exercise reserve exception
const char *caught = 0;
Vector::size_type too_much = v.max_size () + 1;
if (!too_much)
too_much = v.max_size ();
try {
v.reserve (too_much);
}
catch (std::length_error) {
caught = "";
}
catch (...) {
caught = "unknown exception";
}
rw_assert (0 != caught, 0, __LINE__,
"vector<UserClass>(%zu).reserve(%zu) "
"expected exception not thrown",
nelems, too_much);
if (caught)
rw_assert ('\0' == *caught, 0, __LINE__,
"vector<UserClass>(%zu).reserve(%zu) "
"expected length_error, got %s",
nelems, too_much, caught);
#endif // _RWSTD_NO_EXCEPTIONS
}
/**************************************************************************/
static int
run_test (int /* argc */, char** /* argv */)
{
rw_info (0, 0, 0, "std::vector<UserClass>::capacity() const");
rw_info (0, 0, 0, "std::vector<UserClass>::reserve(size_type)");
const Vector::size_type max_elems = Vector::size_type (rw_opt_nloops);
rw_note (0 == rw_opt_no_exceptions, 0, 0, "exception test disabled");
for (Vector::size_type i = 0; i < max_elems; ++i) {
test_capacity (i);
}
return 0;
}
/**************************************************************************/
int main (int argc, char** argv)
{
return rw_test (argc, argv, __FILE__,
"lib.vector.capacity",
0 /* no comment */,
run_test,
"|-no-exceptions# "
"|-nloops#0",
&rw_opt_no_exceptions,
&rw_opt_nloops);
}