Errors assigning to array of structs

Question

I'm reasonably new to c++. I'm currently trying to create and internet radio alarm clock on the ESP32. I've managed to play a station but I was wanting to test out changing between two stations. I've tried creating an array of Station structs to hold relevant info for each Station but I keep getting the same errors when trying to assign to the different elements in the array. It could be that it is quite a simple error but I can't figure it out and I can't see anything too similar anywhere else.

#include <Arduino.h>
#include "WiFi.h"
#include <Audio.h> 
#include <string.h>
#include <SPI.h> 
#define I2S_DOUT     25
#define I2S_BCLK      27
#define I2S_LRC        26  
Audio audio;

#define SSID ""
#define PASSWORD "" 



//function to change station    
void changeStat() {
  int statIndex = (statIndex+1)%2; 
};



void connectToWiFi(){
  Serial.print("Connecting to Wifi"); 
  WiFi.mode(WIFI_STA);
  WiFi.begin(SSID, PASSWORD);

  while(WiFi.status() != WL_CONNECTED){
    Serial.print('.'); 
    delay(1000); 
  }

  Serial.print("\n Connected \n");
  Serial.println(WiFi.localIP());
}

void setup() {
  Serial.begin(9600);   

  //Initialising array of station structures
  struct Station{
    char name[15];  
    char URL[130]; 
  };  

  Station Stats[2]; 
  int statIndex = 0;

  Stats[0] = {"BBC 6Music", "http://stream.live.vc.bbcmedia.co.uk/bbc_6music"};
  Stats[1] = {"BBC Rad4", "http://stream.live.vc.bbcmedia.co.uk/bbc_radio_fourlw"};

  connectToWiFi(); 
  audio.setPinout(I2S_BCLK, I2S_LRC, I2S_DOUT); 
  audio.setVolume(5); 
  audio.connecttohost(Stats[statIndex].URL);
}

void loop() {  

  audio.loop();
}

Specifically, the error I get on the lines Stats[0] and Stats[1] is no match for 'operator=' (operand types are 'setup()::Station' and '<brace-enclosed initializer list>') but I have seen lots of other people using this sort of assignment

Answer 1

This syntax uses initializer list, a feature added to C++ with it's 2011 version.

struct Station
{
    char name[15];  
    char URL[130]; 
};  

Station station = { "BBC 6Music", "http://stream.live.vc.bbcmedia.co.uk/bbc_6music" };

If you can, do switch to a more up to date compiler, at least handling C++14.

If not, you can still resort to C-style:

Station station;
strcpy(station.name, "BBC 6Music");
//...

An other solution would be to provide a user-defined constructor to Station:

struct Station
{
    char name[15];  
    char URL[130]; 
    Station(char const* _name, char const* _url) { /* ... */ }
};

Station station("BBC 6Music", "http://stream.live.vc.bbcmedia.co.uk/bbc_6music");