fileID()

Declaration

@freestanding(expression) macro fileID<T>() -> T where T : ExpressibleByStringLiteral

Overview

The unique identifier has the form module/file, where file is the name of the file in which the expression appears and module is the name of the module that this file is part of.

Because #fileID doesn’t embed the full path to the source file, unlike #filePath, it gives you better privacy and reduces the size of the compiled binary.

Note: To parse a #fileID expression, read the module name as the text before the first slash (/) and the filename as the text after the last slash. In future versions of Swift, the string might contain multiple slashes, such as MyModule/some/disambiguation/MyFile.swift.

This macro’s value can be changed by #sourceLocation, as described in Line Control Statement in The Swift Programming Language.

See Also

Getting Source Location Information

• file()
• filePath()
• function()
• line()
• column()