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a deque added

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Christos Choutouridis 3 years ago
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  1. +193
    -0
      include/cont/deque.h
  2. +191
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      test/tests/deque.cpp

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include/cont/deque.h View File

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/*!
* \file cont/deque.h
* \brief
* A statically allocated deque based on a ring buffer.
*
* \copyright Copyright (C) 2021 Christos Choutouridis <christos@choutouridis.net>
*
* <dl class=\"section copyright\"><dt>License</dt><dd>
* The MIT License (MIT)
*
* 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:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* 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
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
* </dd></dl>
*/
#ifndef TBX_CONT_DEQUE_H_
#define TBX_CONT_DEQUE_H_
#include <core/core.h>
#include <core/ring_iterator.h>
#include <array>
namespace tbx {
/*!
* \class deque
* \brief
* A statically allocated deque based on a ring buffer
*
* The deque uses two ring_iterators one for the front and one for the rear. The iterators
* are pointing to the next available spot, not on the last inserted spot. This way at the
* initialization the iterators wont "pretend" to point to a valid item .
*
* We use a ring buffer of size \c N+1. We start the front iterator at the last location of the buffer
* and the rear on the first. This way when the queue is full the iterators are pointing to the same location.
*
* \tparam Data_t The char-like queued item type. Usually \c char
* \tparam N The size of deque
*/
template <typename Data_t, size_t N>
class deque {
public:
// meta-identity type
using type = deque<Data_t, N>;
using buffer_t = std::array<Data_t, N+1>; // We need N+1 spaces ring buffer for N spaces deque
using iterator_t = ring_iterator<Data_t*, N+1>;
// STL
using value_type = Data_t;
using reference = Data_t&;
using const_reference = const Data_t&;
using pointer = Data_t*;
using const_pointer = const Data_t*;
using iterator = iterator_t;
using const_iterator = const iterator_t;
using reverse_iterator = std::reverse_iterator<iterator>;
using const_reverse_iterator = std::reverse_iterator<const_iterator>;
//! \name Constructor / Destructor
//! @{
public:
//! Default constructor
deque () noexcept :
data_{},
f{data_.data(), N},
r{data_.data()} { }
//! fill contructor
deque(const Data_t& value) noexcept {
data_.fill(value);
f = iterator(data_.data(), N);
r = iterator(data_.data(), N);
}
//! Initializer list contructor
template <typename ...It>
deque(It&& ...it) noexcept :
data_{{std::forward<It>(it)...}},
f(data_.data(), sizeof...(It)),
r(data_.data(), sizeof...(It)) { }
deque(const deque&) = delete; //!< No copies
deque& operator= (const deque&) = delete; //!< No copy assignments
~deque () = default; //!< default destructor
//! @}
//! \name Iterators
//! @{
public:
iterator begin() noexcept { return f+1; }
const_iterator begin() const noexcept { return f+1; }
const_iterator cbegin() const noexcept { return f+1; }
iterator end() noexcept { return r; }
const_iterator end() const noexcept { return r; }
const_iterator cend() const noexcept { return r; }
reverse_iterator rbegin() noexcept { return r; }
const_reverse_iterator rbegin() const noexcept { return r; }
const_reverse_iterator crbegin() const noexcept { return r; }
reverse_iterator rend() noexcept { return f+1; }
const_reverse_iterator rend() const noexcept { return f+1; }
const_reverse_iterator crend() const noexcept { return f+1; }
//! @}
//! \name Capacity
//! @{
public:
//! \return The size of the deque. The items currently in queue.
size_t size() noexcept {
return full() ? N: (r - f) -1;
}
//! \return The maximum size of the deque. The items the queue can hold.
size_t max_size() noexcept { return N; }
//! \return The capacity of the deque. The items the queue can hold.
size_t capacity() noexcept { return N; }
//! \return True if the deque is empty
bool empty() noexcept { return size() == 0 ? true : false; }
//! \return True if the deque is full
bool full() noexcept { return (r == f) ? true : false; }
//! @}
//! \name Member access
//! @{
public:
//! \brief Clears-empty the deque and return it to init state, without
//! really deleting the contents.
void clear() noexcept {
f = iterator_t(data_.data(), N);
r = iterator_t(data_.data());
}
//! \brief Push an item in the front of the deque
//! \param it The item to push
void push_front (const Data_t& it) {
if (full()) return;
*f-- = it;
}
//! \brief Extract an item from the front of the deque and remove it from the deque
//! \param it The item to push
Data_t pop_front () {
if (empty()) return Data_t{};
return *++f;
}
//! \brief Push an item in the back of the deque
//! \param it The item to push
void push_back (const Data_t& it) {
if (full()) return;
*r++ = it;
}
//! \brief Extract an item from the back of the deque and remove it from the deque
//! \param it The item to push
Data_t pop_back () {
if (empty()) return Data_t{};
return *--r;
}
//! \brief Get a reference to the item in the front of the deque without extracting it.
//! \return Reference to the item
Data_t& front() noexcept { return *(f+1); }
const Data_t& front() const noexcept { return *(f+1); }
//! \brief Get a reference to the item in the front of the deque without extracting it.
//! \return Reference to the item
Data_t& back() noexcept { return *(r-1); }
const Data_t& back() const noexcept { return *(r-1); }
//! @}
private:
buffer_t data_{}; //!< The statically allocated buffer
iterator_t f{data_.data(), N}; //!< A ring iterator for the front (points to the next available location)
iterator_t r{data_.data()}; //!< A ring iterator for the rear (points to the next available location).
};
}
#endif /* TBX_CONT_ADEQUE_H_ */

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test/tests/deque.cpp View File

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/*!
* \file deque.cpp
* \brief
* Unit tests for deque
*
* \copyright Copyright (C) 2020 Christos Choutouridis <christos@choutouridis.net>
*
* <dl class=\"section copyright\"><dt>License</dt><dd>
* The MIT License (MIT)
*
* 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:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* 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
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
* </dd></dl>
*
*/
#include <cont/deque.h>
#include <gtest/gtest.h>
namespace Tdeque {
using namespace tbx;
// Test construction
TEST(Tdeque, contruct) {
deque<int, 8> q1;
deque<int, 8> q2{1, 2, 3, 4, 5, 6, 7, 8};
EXPECT_EQ (8UL, q1.capacity());
EXPECT_EQ (8UL, q2.capacity());
}
// simple push-pop functionality
TEST(Tdeque, push_pop) {
deque<int, 8> q1;
deque<int, 8> q2{1, 2, 3, 4, 5, 6, 7, 8};
q1.push_front(1);
q1.push_front(2);
EXPECT_EQ (1, q1.pop_back());
EXPECT_EQ (2, q1.pop_back());
q1.push_back(1);
q1.push_back(2);
EXPECT_EQ (1, q1.pop_front());
EXPECT_EQ (2, q1.pop_front());
q1.push_front(2);
q1.push_back(3);
q1.push_front(1);
q1.push_back(4);
for (int i=1 ; i<= 4 ; ++i)
EXPECT_EQ ((int)i, q1.pop_front());
}
// front-back
TEST(Tdeque, front_back) {
deque<int, 8> q1;
deque<int, 8> q2{1, 2, 3, 4, 5, 6, 7, 8};
q1.push_front(2);
q1.push_front(1);
q1.push_back(3);
q1.push_back(4);
EXPECT_EQ (1, q1.front());
EXPECT_EQ (4, q1.back());
EXPECT_EQ (1, q2.front());
EXPECT_EQ (8, q2.back());
}
// capacity
TEST(Tdeque, capacity) {
deque<int, 8> q1;
deque<int, 8> q2{1, 2, 3, 4, 5, 6, 7, 8};
q1.push_back(1);
q1.clear();
EXPECT_EQ (true, q1.empty());
EXPECT_EQ (true, q2.full());
EXPECT_EQ (8UL, q1.capacity());
EXPECT_EQ (8UL, q2.capacity());
EXPECT_EQ (0UL, q1.size());
EXPECT_EQ (8UL, q2.size());
q1.push_back(2);
EXPECT_EQ (1UL, q1.size());
q1.push_front(1);
EXPECT_EQ (2UL, q1.size());
q1.pop_back();
EXPECT_EQ (1UL, q1.size());
q1.pop_front();
EXPECT_EQ (0UL, q1.size());
}
// push-pop limits
TEST (Tdeque, push_pop_limits) {
deque<int, 8> q1;
deque<int, 8> q2{1, 2, 3, 4, 5, 6, 7, 8};
EXPECT_EQ (int{}, q1.pop_back());
EXPECT_EQ (0UL, q1.size());
EXPECT_EQ (true, q1.empty());
EXPECT_EQ (false, q1.full());
EXPECT_EQ (int{}, q1.pop_front());
EXPECT_EQ (0UL, q1.size());
EXPECT_EQ (true, q1.empty());
EXPECT_EQ (false, q1.full());
q2.push_front(0);
EXPECT_EQ (1, q2.front());
EXPECT_EQ (8, q2.back());
EXPECT_EQ (8UL, q2.size());
EXPECT_EQ (false, q2.empty());
EXPECT_EQ (true, q2.full());
q2.push_back(9);
EXPECT_EQ (1, q2.front());
EXPECT_EQ (8, q2.back());
EXPECT_EQ (8UL, q2.size());
EXPECT_EQ (false, q2.empty());
EXPECT_EQ (true, q2.full());
}
// iterators
TEST (Tdeque, iterators) {
deque<int, 8> q1{1, 2, 3, 4, 5, 6, 7, 8};
int check_it=1;
EXPECT_EQ (q1.begin().base(), q1.end().base());
EXPECT_NE (q1.begin().iter(), q1.end().iter());
EXPECT_EQ (1, *q1.begin());
EXPECT_EQ (true, (q1.begin() == ++q1.end())); // loop edge iterators
for (auto it = q1.begin() ; it != q1.end() ; ++it)
EXPECT_EQ(*it, check_it++);
EXPECT_EQ(9, check_it); // run through all
EXPECT_EQ (1, q1.front()); // queue stays intact
EXPECT_EQ (8, q1.back());
EXPECT_EQ (8UL, q1.size());
EXPECT_EQ (false, q1.empty());
EXPECT_EQ (true, q1.full());
q1.pop_front();
q1.pop_back();
check_it=2;
for (auto& it : q1)
EXPECT_EQ(it, check_it++);
EXPECT_EQ(8, check_it); // run through all
EXPECT_EQ (2, q1.front()); // queue stays intact
EXPECT_EQ (7, q1.back());
EXPECT_EQ (6UL, q1.size());
EXPECT_EQ (false, q1.empty());
EXPECT_EQ (false, q1.full());
deque<int, 8> q2;
q2.push_front(2);
q2.push_front(1);
q2.push_back(3);
q2.push_back(4);
q2.push_back(5);
check_it =1;
for (auto& it : q2)
EXPECT_EQ(it, check_it++);
EXPECT_EQ(6, check_it); // run through all
}
}

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