C++ Struct within Struct + deleted function error - c++

Question

I have a header file in a project where I am declaring a number of structs. Some of the latter structs have members that are the types of earlier declared structs. I am aware that these member structs must be declared before they are used but I have encountered an odd behaviour.
In the file below I tried to add a new member to the second struct (LUT) of type Coordinate. As yo can see the bottom struct libraryEntry has a similar member; this has been the case for a while and has caused no problems.
#ifndef STRUCTS_H
#define STRUCTS_H
#pragma once
#include <string>
#include "Enums.h"
struct Coordinate {
int X;
int Y;
Coordinate(int x, int y) : X(x), Y(y) {}
};
struct LUT {
int offset;
std::string hexCode;
bool modifiedByTrojan;
//Coordinate xyCoordinate; <======= Causes build to fail when uncommented
};
struct libraryEntry {
int id;
DeviceType deviceType;
int offSet;
Coordinate xyCoordinate;
std::string hexCode;
DeviceConfiguration deviceConfig;
libraryEntry(int idNum, DeviceType deviceType, int offSet, Coordinate xyCoordinate, std::string hexCode) :
id(idNum),
deviceType(deviceType),
offSet(offSet),
xyCoordinate(xyCoordinate),
hexCode(hexCode)
{
}
};
#endif
Adding the Coordinate member above causes the error:
'LUT::LUT(void)':attempting to refernce a deleted function
Why is this only happening in the second struct?

Answer 1

In the struct that works (libraryEntry), you have defined a constructor, and in your constructor you are initialising xyCoordinate using its two-arg constructor.
In the struct that fails to compile, you haven't defined any constructors, so you get the default no-arg constructor, which initialises everything, including your Coordinate member, using their default (no-arg) constructors. Coordinate doesn't have a default constructor because you declared a different constructor and that causes the default constructor to be deleted, hence your error message.