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https://stackoverflow.com/questions/47466358/what-is-the-spaceshi...

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What is the <=> ("spaceship", three-way comparison) operator in C++?

On 2017-11-11, the ISO C++ committee adopted Herb Sutter's proposal for the <=> "spaceship" three-way comparison operator as one of the new features that were added to C++20.In the paper titled Consistent comparison Sutter, Maurer and Brown demonstrate the concepts of the new design. For an overview of the proposal, here's an excerpt from the article:

https://en.cppreference.com/w/cpp/language/default_comparisons

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Default comparisons (since C++20) - cppreference.com

Definition. A defaulted comparison operator function is a non-template comparison operator function (i.e. <=>, ==, !=, <, >, <=, or >=) satisfying all following conditions: . It is a non-static member or friend of some class C.; It is defined as defaulted in C or in a context where C is complete.; It has two parameters of type const C & or two parameters of type C, where the implicit object ...

https://www.geeksforgeeks.org/3-way-comparison-operator-space-shi...

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3-way comparison operator (Space Ship Operator) in C++ 20

The spaceship operator determines for two objects A and B whether A < B, A = B, or A > B. The spaceship operator or the compiler can auto-generate it for us. Also, a three-way comparison is a function that will give the entire relationship in one query. Traditionally, strcmp() is such a function. Given two strings it will return an integer where,

https://devblogs.microsoft.com/cppblog/simplify-your-code-with-ro...

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Simplify Your Code With Rocket Science: C++20’s Spaceship Operator

The spaceship operator is a welcomed addition to C++ and it is one of the features that will simplify and help you to write less code, and, sometimes, less is more. So buckle up with C++20’s spaceship operator! We urge you to go out and try the spaceship operator, it’s available right now in Visual Studio 2019 under /std:c++latest!

https://en.wikipedia.org/wiki/Three-way_comparison

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Three-way comparison - Wikipedia

In C++, the C++20 revision adds the spaceship operator <=>, which returns a value that encodes whether the 2 values are equal, less, greater, or unordered and can return different types depending on the strictness of the comparison. [3] The name's origin is due to it reminding Randal L. Schwartz of the spaceship in an HP BASIC Star Trek game. [4]

https://www.modernescpp.com/index.php/c-20-the-three-way-comparis...

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C++20: The Three-Way Comparison Operator – MC++ BLOG

The three-way comparison operator <=> is often just called the spaceship operator. The spaceship operator determines whether A < B, A = B, or A > B for two values, A and B. You can define the spaceship operator, or the compiler can auto-generate it. Let me start classically to appreciate the three-way comparison operator’s advantages ...

https://cmp99.medium.com/introduction-to-the-c-20-spaceship-opera...

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Introduction to the C++20 spaceship operator | by CMP | Medium

C++20 introduced the three-way comparison operator, also known as the “spaceship operator” due to its appearance: <=>. The purpose is to streamline the process of comparing objects. The Basics. Below is a simple example that uses this new spaceship operator:

https://www.studyplan.dev/pro-cpp/spaceship-operator

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C++20 Comparisons | The Spaceship Operator and Expression Rewriting | A ...

In this lesson, we explored the power of C++20's spaceship operator (<=>) and expression rewriting, showcasing how these features make it easier to implement comparison operators for custom types. Key Takeaways. Through the use of these C++20 features, only two primary comparison operators need to be defined (== and <=>).

https://andreasfertig.com/blog/2020/06/cpp20-inside-of-a-spaceshi...

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C++20: Inside of a spaceship - Andreas Fertig's Blog

This std::operator> takes two arguments, first the result of the spaceship-operator and second an integer to which the result is then compared. All this comes with the new header comparison and a C++20 able compiler. Equality and inequality expressions can now find reversed and rewritten candidates

https://indii.org/blog/overloading-the-spaceship-operator/

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C++: Overloading the Spaceship Operator, A Recipe - indii.org

How to overload the three-way comparison (spaceship) operator<=>, and a reminder to overload operator== as well. 3 min read / 9 Feb 24 (updated 24 Nov 24) The three-way comparison operator <=> (colloquially known as the spaceship operator) was introduced in C++20 to reduce boilerplate when overloading comparison operators.

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Three-way comparison

In C++, the C++20 revision adds the spaceship operator <=>, which returns a value that encodes whether the 2 values are equal, less, greater, or unordered and can return different types depending on the strictness of the comparison. The name's origin is due to it reminding Randal L. Schwartz of the spaceship in an HP BASIC Star Trek game.

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