Why Are Some Go Functions, Like `math.Floor`, Bodiless?
Published on 2025-01-29
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Bodiless Functions in Go
The provided code presents a peculiar situation where the Floor function appears bodiless, lacking a function body. This can be encountered when examining the source code of math/floor.go.
Upon investigation, it becomes clear that this phenomenon is intentional. In Go, bodiless functions are permitted for implementations written in assembly. The actual implementation can be found in the floor_ARCH.s files (e.g., for AMD64).
As stated in the Go specification:
A function declaration may omit the body. Such a declaration provides the signature for a function implemented outside Go, such as an assembly routine.
This provision allows low-level functions to be defined in assembly while maintaining a consistent, well-typed Go interface.
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