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Introduction to Attributes

Learn how C++20 enhances programming with new attributes such as [[nodiscard("reason")]], [[likely]], [[unlikely]], and [[no_unique_address]]. Understand how these attributes express interface intent, optimize code, and manage compiler behavior. This lesson guides you through applying multiple attributes effectively to improve code safety and performance.

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With C++20, we get new and improved attributes such as [[nodiscard("reason")]], [[likely]], [[unlikely]], and [[no_unique_address]]. In particular, [[nodiscard("reason")]] can be used to explicitly express the intent of our interface.

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