ArxContainer

C++ container-like classes (vector, array, deque, map etc.) for Arduino which cannot use STL

Note

• ArxContainer is C++ container-like classes for Arduino
  • Containers in this library is defined inside namespace arx::stdx instad of std (e.g. arx::stdx::vector)
  • All of the functions is not supported currently
• If standard libraries are available, automatically use std version instead of arx::stdx version

Supported Container Types

• vector
• array
• map (pair)
• deque

Supported Boards

arx::stdx version of containers are enabled only if you use following architecture. In other borads, arx::stdx version is disabled and standard libraries (std version) will be imported (because they can use them).

• AVR (Uno, Nano, Mega, etc.)
• MEGAAVR (Uno WiFi, Nano Ecery, etc.)
• SAM (Due)

Usage

vector

// initialize with initializer_list
std::vector<int> vs {1, 2, 3};
// this is same as
// arx::stdx::vector<int> vs {1, 2, 3};

// add contents
for (size_t i = 4; i <= 5; ++i)
    vs.push_back(i);

// index access
for (size_t i = 0; i < vs.size(); ++i)
    Serial.println(vs[i]);

// range-based access
for (const auto& v : vs)
    Serial.println(v);

array

// initialize with initializer_list
std::array<int, 3> arr {1, 2, 3};
// this is same as
// arx::stdx::array<int, 3> arr {1, 2, 3};

// fill
arr.fill(123);

// index access
for (size_t i = 0; i < arr.size(); ++i)
    Serial.println(arr[i]);

// range-based access
for (const auto& a : arr)
    Serial.println(a);

map

// initialize with initializer_list
std::map<String, int> mp {{"one", 1}, {"two", 2}};
// this is same as
// arx::stdx::map<String, int> mp {{"one", 1}, {"two", 2}};

// add contents
mp.insert("three", 3);
mp["four"] = 4;

// range based access
for (const auto& m : mp)
{
    Serial.print("{");
    Serial.print(m.first); Serial.print(",");
    Serial.print(m.second);
    Serial.println("}");
}

// key access
Serial.print("one   = "); Serial.println(mp["one"]);
Serial.print("two   = "); Serial.println(mp["two"]);
Serial.print("three = "); Serial.println(mp["three"]);
Serial.print("four  = "); Serial.println(mp["four"]);

deque

// initialize with initializer_list
std::deque<int> dq {1, 2, 3};
// this is same as
// arx::stdx::deque<int> dq {1, 2, 3};

// add contents
for (int i = 4; i <= 5; ++i)
    dq.push_back(i);

// index access
for (int i = 0; i < dq.size(); ++i)
    Serial.print(dq[i]);

Detail

ArxContainer is C++ container-like classes for Arduino. This library is based on arx::RingBuffer and arx::stdx::xxxx is limited-size container. arx::RingBuffer can be used as:

ArxRingBuffer<uint8_t, 4> buffer;

buffer.push(1);
buffer.push(2);
buffer.push(3);

for(size_t i = 0; i < buffer.size(); ++i)
    Serial.println(buffer[i]);

buffer.pop();

for(auto& b : buffer)
    Serial.println(b);

arx::stdx::xxxx are derived from RingBuffer and defined as:

namespace arx {
namespace stdx {
    template <typename T, size_t N = ARX_VECTOR_DEFAULT_SIZE>
    struct vector : public RingBuffer<T, N>

    template <typename T, size_t N>
    struct array : public RingBuffer<T, N>

    template <class Key, class T, size_t N = ARX_MAP_DEFAULT_SIZE>
    struct map : public RingBuffer<pair<Key, T>, N>

    template <typename T, size_t N = ARX_DEQUE_DEFAULT_SIZE>
    struct deque : public RingBuffer<T, N>
}
}

So range-based loop cannot be applyed to arx::stdx::deque (iterator is not continuous because it is based on RingBuffer).

Manage Size Limit of Container

Global default size of container can be changed by defining these macros before #include <ArxContainer.h>.

#define ARX_VECTOR_DEFAULT_SIZE XX // default: 16
#define ARX_MAP_DEFAULT_SIZE XX    // default: 16
#define ARX_DEQUE_DEFAULT_SIZE XX  // default: 16

Or you can change each container size by template argument.

arx::stdx::vector<int, 3> vs;
arx::stdx::map<String, int, 4> ms;
arx::stdx::deque<int, 5> ds;

Roadmap

This library will be updated if I want to use more container interfaces on supported boards shown above. PRs are welcome!

Used Inside of

• Packetizer
• MsgPack
• ArduinoOSC
• ArtNet
• Tween
• TimeProfiler
• TaskManager
• ArxStringUtils
• Debouncer

License

MIT