#include <LinkedList.h>
#include "mString.h"
#ifdef __arm__
// should use uinstd.h to define sbrk but Due causes a conflict
extern "C" char* sbrk(int incr);
#else   // __ARM__
extern char *__brkval;
#endif  // __arm__
int freeMemory();
struct btn_t {
  int x = -1;
  int y = -1;
  int w = -1;
  int h = -1;
  bool visible = false;
  //mString<16> text;  //text or .jpg
  //mString<20> cmd;
  String text;  //text or .jpg
  String cmd;

  bool img = false;
  bool isTouch = false;
};

LinkedList<btn_t> list_btn;

//SSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSS
void setup() {
  Serial.begin(115200);
  Serial.print(F("mem free:"));
  Serial.println(freeMemory());

  for (int n = 0; n < 10; n++)
   {
    //btn_t BTN;
    //BTN.x = 100;
    //BTN.text = "N:" + String(n);
    // list_btn.add(BTN);
    list_btn.add(btn_t());
    list_btn[n].x = 100;
    list_btn[n].text = "NNNN:" + String(n);
  }

  Serial.print(F("mem ADD:"));
  Serial.println(freeMemory());
  while (list_btn.size() != 0)
  {

    btn_t BTN = list_btn.pop();
    Serial.println(BTN.text);

  }

  //  list_btn.clear();
  Serial.print(F("mem END:"));
  Serial.println(freeMemory());
  // Serial.print(F("size:"));
  // Serial.println(list_btn.size());
}


void loop() {

}

int freeMemory() {
  char top;
#ifdef __arm__
  return &top - reinterpret_cast<char*>(sbrk(0));
#elif defined(CORE_TEENSY) || (ARDUINO > 103 && ARDUINO != 151)
  return &top - __brkval;
#else   // __arm__
  return __brkval ? &top - __brkval : &top - __malloc_heap_start;
#endif  // __arm__
}