4. Overloading the spaceship Operator - spaceship doesnt work

C++
1

When I use attempt to use the spaceship operator I get issues. Primarily ‘operator<=>’ returns “Function definition for ‘operator<=>’ not found” if I change this to some non-spaceship operator such as a bool like ‘>=’ I don’t get the same issue. the .cpp file looks to match but the header always returns an error.

Sometimes randomly std::strong_ordering in the same line returns one of many issues, either needing ‘#include ’ (which is included) or stating that it is not a member of the std namespace. This issue is weird and sometimes go away when I tab into the cpp file and back. Its inconsistent.

The cpp file itself does not appear to return errors, and yes, I am using C++20

Length.h

#ifndef ADVANCED_LENGTH_H
#define ADVANCED_LENGTH_H

#include <compare>

class Length
{
public:
	explicit Length(int value);
	bool operator==(const Length& other) const;
	bool operator==(int other) const;
	bool operator!=(int other) const;
	std::strong_ordering operator<=>(const Length& other) const;
private:
	int value;
};

#endif

Length.cpp

#include "Length.h"

Length::Length(int value) : value(value) {}

bool Length::operator==(const Length& other) const
{
	return value == other.value;
}

bool Length::operator==(int other) const
{
	return value == other;
}

bool Length::operator!=(int other) const
{
	return !(value == other);
}


std::strong_ordering Length::operator<=>(const Length& other) const
{
	return std::strong_ordering();
}