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Questions - spaceship-operator

How to properly implement operator<=> for a non-POD class?

I'm looking for a way to implement the three-way comparison operator and the operator== for the following class: class Foo { public: auto operator<=>( const Foo& rhs ) const noexcept = d...
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digito_evo

c++

comparison

c++20

spaceship-operator

Votes: 0

Answers: 1

Latest Answer

I believe this is a partial order, which is an order where elements may be incomparable (none of <, >, or == hold between them). You should verify the necessary laws hold (a <= b iff a < b...
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HTNW

How to use three-way comparison (spaceship op) to implement operator== between different types?

Simple Task: I have these two types struct type_a{ int member; }; struct type_b{ int member; }; I want to use this new C++20 spaceship op that everyone says is so cool to be able to write type...
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Basti

c++

c++20

spaceship-operator

Votes: 0

Answers: 2

Latest Answer

The premise of the question is wrong. You don't use the three-way comparison operator (<=>) to implement ==: you use == to implement ==: bool operator==(type_a a, type_b b) { return a.member...
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Barry

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