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#include <memory>
#include <iostream>
//-----------------------------------------------------------------------------
// class_impl_itf.h
//
// start by defining an interface for your implementation
// this allows the outer class to call functions without knowing
// its implementation yet.
class class_impl_itf
{
public:
virtual int get_value() const noexcept = 0;
virtual ~class_impl_itf() = default;
protected:
class_impl_itf() = default;
};
//-----------------------------------------------------------------------------
// class.h
// #include "class_impl_itf.h"
class class_t final
{
public:
explicit class_t(int value);
~class_t() = default;
// define the compare operator
friend inline auto operator<=>(const class_t& lhs, const class_t& rhs)
{
return lhs.m_pimpl->get_value() <=> rhs.m_pimpl->get_value();
}
private:
// do not directly refer to the implementation class but its interface
std::unique_ptr<class_impl_itf> m_pimpl;
};
//-----------------------------------------------------------------------------
// class_impl.h
// #include "class_impl_itf.h"
class class_impl_t final :
public class_impl_itf
{
public:
explicit class_impl_t(int value);
int get_value() const noexcept override;
private:
private:
int m_value;
};
//-----------------------------------------------------------------------------
// class.cpp
// #include "class.h"
// #include "class_impl.h"
// class_t source file
class_t::class_t(int value) :
m_pimpl{std::make_unique<class_impl_t>(value)}
{
}
//-----------------------------------------------------------------------------
// class_impl.cpp
//
class_impl_t::class_impl_t(int value) :
m_value{value}
{
}
int class_impl_t::get_value() const noexcept
{
return m_value;
}
//-----------------------------------------------------------------------------
// main.cpp
// #include <class.h>
int main()
{
class_t obj1{1};
class_t obj2{2};
if (obj1 < obj2)
{
std::cout << "obj1 < obj2";
}
return 0;
}
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