fixedstack.cc

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/*
                          Aleph_w
 
  Data structures & Algorithms
  version 2.0.0b
  https://github.com/lrleon/Aleph-w
 
  This file is part of Aleph-w library
 
  Copyright (c) 2002-2026 Leandro Rabindranath Leon
 
  Permission is hereby granted, free of charge, to any person obtaining a copy
  of this software and associated documentation files (the "Software"), to deal
  in the Software without restriction, including without limitation the rights
  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  copies of the Software, and to permit persons to whom the Software is
  furnished to do so, subject to the following conditions:
 
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  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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*/
 
 
 
# include <gtest/gtest.h>
 
# include <tpl_arrayStack.H>
# include <ahFunctional.H>
 
using namespace std;
using namespace testing;
using namespace Aleph;
 
constexpr size_t N = 17;
 
struct SimpleStack : public Test
{
  size_t n = 0;
  FixedStack<int> s;
  SimpleStack() : s(N)
  {
    for (size_t i = 0; i < N; ++i, ++n)
      s.push(i);
  }
};
 
struct ComplexStack : public Test
{
  size_t n = 0;
  FixedStack<DynList<int>> s;
  ComplexStack() : s(N)
  {
    for (size_t i = 0; i < N; ++i, ++n)
      s.push({ int(i), 0, 1, 2, int(i) });
  }
};
 
TEST(FixedStack, empty_stack)
{
  FixedStack<int> s;
  EXPECT_TRUE(s.is_empty());
  EXPECT_EQ(s.size(), 0);
}
 
TEST_F(SimpleStack, push_pop)
{
  EXPECT_FALSE(s.is_empty());
  EXPECT_EQ(s.size(), n);
  EXPECT_EQ(s.top(), n - 1);
  for (size_t i = 0; i < n; ++i)
    EXPECT_EQ(s.top(i), n - i - 1);
 
  for (size_t i = 0; i < n; ++i)
    EXPECT_EQ(s.pop(), n - i - 1);
  EXPECT_TRUE(s.is_empty());
  EXPECT_EQ(s.size(), 0);
 
  s.pushn(n);
  EXPECT_EQ(s.size(), n);
  for (size_t i = 0; i < n; ++i)
    s.top(i) = i;
 
  for (size_t i = 0; i < n; ++i)
    EXPECT_EQ(s.top(i), i);
 
  EXPECT_EQ(s.popn(n), n - 1);
  EXPECT_TRUE(s.is_empty());
  EXPECT_EQ(s.size(), 0);
 
  s.empty();
  EXPECT_TRUE(s.is_empty());
  EXPECT_EQ(s.size(), 0);
}
 
TEST_F(ComplexStack, push_pop)
{
  EXPECT_FALSE(s.is_empty());
  EXPECT_EQ(s.size(), n);
  EXPECT_EQ(s.top().get_first(), n - 1);
  for (size_t i = 0; i < n; ++i)
    {
      EXPECT_EQ(s.top(i).get_first(), n - i - 1);
      EXPECT_EQ(s.top(i).get_last(), n - i - 1);
      EXPECT_EQ(s.top(i).nth(1), 0);
    }
 
  for (size_t i = 0; i < n; ++i)
    {
      auto l = s.pop();
      EXPECT_EQ(l.get_first(), n - i - 1);
      EXPECT_EQ(l.get_last(), n - i - 1);
      EXPECT_EQ(l.nth(1), 0);
      EXPECT_EQ(l.nth(2), 1);
    }
  EXPECT_TRUE(s.is_empty());
  EXPECT_EQ(s.size(), 0);
 
  {
    auto & ll = s.pushn(n);
    EXPECT_TRUE(ll.is_empty());
  }
  EXPECT_EQ(s.size(), n);
  for (size_t i = 0; i < n; ++i)
    s.top(i) = { int(i), 0, 1, int(i) };
 
  for (size_t i = 0; i < n; ++i)
    {
      auto & l = s.top(i);
      EXPECT_EQ(l.get_first(), i);
      EXPECT_EQ(l.get_last(), i);
      EXPECT_EQ(l.nth(1), 0);
      EXPECT_EQ(l.nth(2), 1);
    }
 
  {
    auto ll = s.popn(n);
    EXPECT_EQ(ll.get_first(), n - 1);
    EXPECT_EQ(ll.get_last(), n - 1);
    EXPECT_EQ(ll.nth(1), 0);
    EXPECT_EQ(ll.nth(2), 1);
  }
  EXPECT_TRUE(s.is_empty());
  EXPECT_EQ(s.size(), 0);
}
 
TEST(FixedStack, Iterator_on_empty_stack)
{
  FixedStack<int> s;
  auto it = s.get_it();
  ASSERT_FALSE(it.has_curr());
  ASSERT_THROW(it.get_curr(), overflow_error);
  ASSERT_THROW(it.next(), overflow_error);
}
 
TEST_F(SimpleStack, Iterator)
{
  auto it = s.get_it(); 
  for (size_t i = 0; it.has_curr(); it.next(), ++i)
    ASSERT_EQ(it.get_curr(), i);
 
  it.reset_last();
  for (size_t i = 0; it.has_curr(); it.prev(), ++i)
    ASSERT_EQ(it.get_curr(), n - i -1);
}
 
TEST_F(ComplexStack, Iterator)
{
  auto it = s.get_it(); 
  for (size_t i = 0; it.has_curr(); it.next(), ++i)
    {
      ASSERT_EQ(it.get_curr().get_first(), i);
      ASSERT_EQ(it.get_curr().get_last(), i);
      ASSERT_EQ(it.get_curr().nth(1), 0);
      ASSERT_EQ(it.get_curr().nth(2), 1);
    }
 
  it.reset_last();
  for (size_t i = 0; it.has_curr(); it.prev(), ++i)
    {
      ASSERT_EQ(it.get_curr().get_first(), n - i -1);
      ASSERT_EQ(it.get_curr().get_last(), n - i -1);
      ASSERT_EQ(it.get_curr().nth(1), 0);
      ASSERT_EQ(it.get_curr().nth(2), 1);
    }
}
 
TEST_F(SimpleStack, copy_operations)
{
  { // test copy ctor
    FixedStack<int> sc = s;
    ASSERT_FALSE(sc.is_empty());
    ASSERT_EQ(s.size(), sc.size());
    int i = 0;
    for (; i < sc.size(); ++i)
      ASSERT_EQ(s.top(i), sc.top(i));
    ASSERT_EQ(i, s.size());
  }
  
  { // test copy assignment 
    FixedStack<int> sc;
    sc = s;
    ASSERT_FALSE(sc.is_empty());
    ASSERT_EQ(s.size(), sc.size());
    int i = 0;
    for (; i < sc.size(); ++i)
      ASSERT_EQ(s.top(i), sc.top(i));
    ASSERT_EQ(i, s.size());
  }
 
  // test move ctor
  FixedStack<int> sc(move(s));
  ASSERT_FALSE(sc.is_empty());
  ASSERT_EQ(sc.size(), n);
  ASSERT_EQ(s.size(), 0);
  ASSERT_TRUE(s.is_empty());
  int i = 0;
  for (; i < sc.size(); ++i)
    ASSERT_EQ(sc.top(i), n - i - 1);
  ASSERT_EQ(i, sc.size());
 
  s = move(sc);
  ASSERT_FALSE(s.is_empty());
  ASSERT_EQ(s.size(), n);
  ASSERT_TRUE(sc.is_empty());
  i = 0;
  for (; i < s.size(); ++i)
    ASSERT_EQ(s.top(i), n - i - 1);
  ASSERT_EQ(i, s.size());
}
 
TEST_F(ComplexStack, copy_operations)
{
  { // test copy ctor
    FixedStack<DynList<int>> sc = s;
    ASSERT_FALSE(sc.is_empty());
    ASSERT_EQ(s.size(), sc.size());
    int i = 0;
    for (; i < sc.size(); ++i)
      ASSERT_TRUE(eq(s.top(i), sc.top(i)));
    ASSERT_EQ(i, s.size());
  }
  
  { // test copy assignment 
    FixedStack<DynList<int>> sc;
    sc = s;
    ASSERT_FALSE(sc.is_empty());
    ASSERT_EQ(s.size(), sc.size());
    int i = 0;
    for (; i < sc.size(); ++i)
      ASSERT_TRUE(eq(s.top(i), sc.top(i)));
    ASSERT_EQ(i, s.size());
  }
 
  // test move ctor
  FixedStack<DynList<int>> sc(move(s));
  ASSERT_FALSE(sc.is_empty());
  ASSERT_EQ(sc.size(), n);
  ASSERT_EQ(s.size(), 0);
  ASSERT_TRUE(s.is_empty());
  int i = 0;
  for (; i < sc.size(); ++i)
    {
      ASSERT_EQ(sc.top(i).get_first(), n - i - 1);
      ASSERT_EQ(sc.top(i).get_last(), n - i - 1);
      ASSERT_EQ(sc.top(i).nth(1), 0);
      ASSERT_EQ(sc.top(i).nth(2), 1);
    }
  ASSERT_EQ(i, sc.size());
 
  s = move(sc);
  ASSERT_FALSE(s.is_empty());
  ASSERT_EQ(s.size(), n);
  ASSERT_TRUE(sc.is_empty());
  i = 0;
  for (; i < s.size(); ++i)
    {
      ASSERT_EQ(s.top(i).get_first(), n - i - 1);
      ASSERT_EQ(s.top(i).get_last(), n - i - 1);
      ASSERT_EQ(s.top(i).nth(1), 0);
      ASSERT_EQ(s.top(i).nth(2), 1);
    }
  ASSERT_EQ(i, s.size());
}
 
TEST_F(SimpleStack, traverse)
{
  size_t i = 0;
  s.traverse([&i] (auto k) { EXPECT_EQ(k, i); return k == i++; });
  ASSERT_EQ(i, n);
}
 
TEST_F(ComplexStack, traverse)
{
  int i = 0;
  s.traverse([&i] (const DynList<int> & l)
       {
         EXPECT_EQ(l.get_first(), i);
         EXPECT_EQ(l.get_last(), i);
         EXPECT_EQ(l.nth(1), 0);
         EXPECT_EQ(l.nth(2), 1);
         return l.get_first()  == i++;
       });
  ASSERT_EQ(i, n);
}