ENUM and array declaration using enum to create an array of objects - arrays

Question

I am writing a wrapper for neopixel library. I am adding a full source code of my program:
I have created my own custom function toggle_led_strip which is using a function from the neopixelbus led strip library.
#include "NeoPixelBus.h"
#include <Adafruit_I2CDevice.h>
#define PixelCount 8 // this example assumes 4 pixels, making it smaller will cause a failure
#define PixelPin 27 // make sure to set this to the correct pin, ignored for Esp8266
#define colorSaturation 250
RgbColor blue(0,0,255);
RgbColor black(0);
NeoPixelBus<NeoGrbFeature, NeoEsp32Rmt0800KbpsMethod> strip(PixelCount, PixelPin);
void toggle_led_strip(RgbColor colour){
strip.SetPixelColor(0, colour);
strip.Show();
delay(100);
strip.SetPixelColor(0, black);
strip.Show();
delay(100);
}
void setup() {
strip.Begin();
// put your setup code here, to run once:
}
void loop() {
toggle_led_strip(blue);
// put your main code here, to run repeatedly:
}
Normally, when I want to create a colour variable, I must create it in such way:
RgbColor blue(0,0,255);
RgbColor black(0);
However, I am learning about different ways of creating colour objects and someone has suggested me to use ENUM and array method as such:
enum COLORS
{
blue,black
};
RgbColor a_color[2] = {
[blue] = {0,0,255},
[black] ={0}
};
From what I understand, the code above will set the first variable of enum (blue) to the {0,0,255} and the second variable of enum (black) to {0} so the result should be exactly the same as if I have used
RgbColor blue(0,0,255);
RgbColor black(0);
is that correct understanding?
Then I try to pass the color to the function as following:
//void toggle_led_strip(RgbColor colour) This is function prototype
toggle_led_strip(blue)
But it does not work when using enum and array method and works perfectly with the first method

Answer 1

Those who are interested in the solution:
void toggle_led_strip(COLORS colour){
strip.SetPixelColor(0, a_color[colour]);
strip.Show();
delay(100);
strip.SetPixelColor(0, a_color[black]);
strip.Show();
delay(100);
}
It turned out to be quite simple once you understand that an ENUM is treated as an array index and nothing else. It works as expected now.