Antoine van der Lee • 8/9/2026

Sendable and @Sendable closures explained with code examples

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This article explains Swift's Sendable protocol and @Sendable closures, which are essential for data-race safety in concurrent programming. It covers when to use Sendable, how the compiler verifies thread safety, implicit conformance for value types, and limitations with reference types. Includes code examples for structs, classes, generics, and enums, plus practical guidance for using @Sendable in async tasks and actor isolation.

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#closures #concurrency #Swift
Sendable and @Sendable closures explained with code examples

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