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I'm working with a custom C++ library, CPSTL, for Arduino, which includes a cpstd::vector class that is designed to work with cpstd::initializer_list, cpstd::initializer_list is supposed to mimic std::initializer_list.

However, I'm having trouble initializing a cpstd::vector using brace-enclosed initializer lists.

I've looked up many sources online, and it seems there is not a lot of information in the topic, but came up to things such as FastArduino: initializer list, and Arduino STL: Initializer list. Giving me hopes that it is actually possible. (I can't use those libraries, because they lack the build system generation tools on the library I am developing, they also lack on customizability,and also as a good learning experience)

could not convert '{0, 1, 2, 3, 4}' from 'brace-enclosed initializer list' to 'cpstd::vector<unsigned char>'.

cpstd::vector<unsigned char> myVector = {0, 1, 2, 3, 4};

I have already implemented a custom cpstd::initializer_list and constructor that should handle this, but the issue persists. Is there something specific to the Arduino environment that could be causing this issue?

• I have verified that the cpstd::initializer_list is correctly defined and included in my code.

• The cpstd::vector class is included and accessible.

• I have reviewed my cpstd::vector class, and the constructor for cpstd::initializer_list is correctly implemented.

• While reading the error log, I noticed that std::initializer_list constructor has two parameters, a pointer to the data, and also a variable telling the length of the braced enclosed list, however I noticed that the list ends up casting to a single parameter, hence having no possible constructor to call

What could be causing this issue, and how can I resolve it to initialize cpstd::vector using brace-enclosed initializer lists in the Arduino environment? I think the maain issue is with boards that have no STL support. (i.e. AVR based boards)

I'm working with a custom C++ library, CPSTL, for Arduino, which includes a cpstd::vector class that is designed to work with cpstd::initializer_list, cpstd::initializer_list is supposed to mimic std::initializer_list.

However, I'm having trouble initializing a cpstd::vector using brace-enclosed initializer lists.

I've looked up many sources online, and it seems there is not a lot of information in the topic, but came up to things such as FastArduino: initializer list, and Arduino STL: Initializer list. Giving me hopes that it is actually possible. (I can't use those libraries, because they lack the build system generation tools on the library I am developing, they also lack on customizability, and also as a good learning experience)

could not convert '{0, 1, 2, 3, 4}' from 'brace-enclosed initializer list' to 'cpstd::vector'.

    cpstd::vector<unsigned char> myVector = {0, 1, 2, 3, 4};

I have already implemented a custom cpstd::initializer_list and constructor that should handle this, but the issue persists. Is there something specific to the Arduino environment that could be causing this issue?

• I have verified that the cpstd::initializer_list is correctly defined and included in my code.

• The cpstd::vector class is included and accessible.

• I have reviewed my cpstd::vector class, and the constructor for cpstd::initializer_list is correctly implemented.

• While reading the error log, I noticed that std::initializer_list constructor has two parameters, a pointer to the data, and also a variable telling the length of the braced enclosed list, however I noticed that the list ends up casting to a single parameter, hence having no possible constructor to call

What could be causing this issue, and how can I resolve it to initialize cpstd::vector using brace-enclosed initializer lists in the Arduino environment? I think the main issue is with boards that have no STL support. (i.e. AVR based boards)

I've tried various approaches, but I keep getting the error: "could not convert '{0, 1, 2, 3, 4}' from 'brace-enclosed initializer list' to 'cpstd::vector'."

I've tried various approaches, but I keep getting the error:

could not convert '{0, 1, 2, 3, 4}' from 'brace-enclosed initializer list' to 'cpstd::vector<unsigned char>'.

#include <Arduino.h> 
#include <stddef.h> 

namespace cpstd {

  template<typename T>
  class initializer_list {
  public:
    using value_type = T;
    using reference = const T&;
    using const_reference = const T&;
    using size_type = size_t;
    using const_iterator = const T*;

  private:
    const_iterator _M_array;
    size_type _M_len;

    constexpr initializer_list(const T* array, size_type size) noexcept
      : _M_array(array), _M_len(size) {}

  public:
    constexpr initializer_list() noexcept
      : _M_array(nullptr), _M_len(0) {}

    constexpr size_type size() const noexcept {
      return _M_len;
    }
    constexpr const_iterator begin() const noexcept {
      return _M_array;
    }
    constexpr const_iterator end() const noexcept {
      return _M_array + _M_len;
    }
  };
}

template<typename T>
class exampleClass{
  protected:
    T buffer[10];
    size_t len;

  public:
    exampleClass(): len(0) {}
    exampleClass(cpstd::initializer_list<T> il){
      len = il.size();
      for(size_t i = 0; i < len; i++){
        buffer[i] = *(il.begin()+i);
      }
    }

    exampleClass& operator=(cpstd::initializer_list<T> il){
      len = il.size();
      for(size_t i = 0; i < len; i++){
        buffer[i] = *(il.begin()+i);
      }      
    }
    
    size_t size() const {return len;}
    T* data() const {return len;}
};
 
exampleClass<uint8_t> myObject = {0,1,2}; // <-- Compilation error: could not convert '{0, 1, 2}' from '<brace-enclosed initializer list>' to 'exampleClass<unsigned char>'

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);

  Serial.println(myObject.size());
  Serial.println(myObject.data()[0]);
}

void loop() {
  // put your main code here, to run repeatedly:

}

#include <Arduino.h> 
#include <stddef.h> 

namespace cpstd {

  template<typename T>
  class initializer_list {
  public:
    using value_type = T;
    using reference = const T&;
    using const_reference = const T&;
    using size_type = size_t;
    using const_iterator = const T*;

  private:
    const_iterator _M_array;
    size_type _M_len;

    constexpr initializer_list(const T* array, size_type size) noexcept
      : _M_array(array), _M_len(size) {}

  public:
    constexpr initializer_list() noexcept
      : _M_array(nullptr), _M_len(0) {}

    constexpr size_type size() const noexcept {
      return _M_len;
    }
    constexpr const_iterator begin() const noexcept {
      return _M_array;
    }
    constexpr const_iterator end() const noexcept {
      return _M_array + _M_len;
    }
  };
}

template<typename T>
class exampleClass{
  protected:
    T buffer[10];
    size_t len;

  public:
    exampleClass(): len(0) {}
    exampleClass(cpstd::initializer_list<T> il){
      len = il.size();
      for(size_t i = 0; i < len; i++){
        buffer[i] = *(il.begin()+i);
      }
    }

    exampleClass& operator=(cpstd::initializer_list<T> il){
      len = il.size();
      for(auto i = il.begin(); i < il.end(); i++){
        buffer[i] = *i;
      }      
    }
     

    size_t size() const {return len;}
    T data(size_t x) const {return buffer[x];}
};


void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  
  exampleClass<uint8_t> myObject = {0,1,2,3}; 

  Serial.println(myObject.size());
  Serial.println(myObject.data(0));
  Serial.println(myObject.data(1));
  Serial.println(myObject.data(2));
  Serial.println(myObject.data(3));


}

void loop() {
  // put your main code here, to run repeatedly:

}