Type signature

As explained in Refactoring to Rust

A function signature specifies a function's parameter types, return type, and the semantic roles of those values.

How Refactoring to Rust covers it

How deep it goes

Explains parameter types, return types, semantic roles, and mutability implications, stopping short of broader type-system theory.

Examples

Compares the C and Rust declarations for the calculator's solve function.

What it assumes

Assumes familiarity with a C function declaration while teaching Rust pointer types and mutability signals through the translation.

What you can do after

Apply it via matching Rust parameter and return types to an existing C function interface.

How it connects

Connects function signatures with C FFI, Rust pointers, mutability, and the libc crate.

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Also explained in

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  F# in Action: A Revised Edition of Get Programming with F#A type signature is a notation describing the types that make up a value or expression, including the structure of composite types.
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  The Well-Grounded Python Developer: How the pros use Python and FlaskA function signature is the part of a function definition that specifies its callable name and parameters.
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  liveBookmanning.com
  Software Design for Python ProgrammersA function signature is the specification consisting of a function's name and the number, datatypes, and order of its parameters.
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  liveBookmanning.com
  Learn Rust in a Month of LunchesA function signature is the declaration-level specification of a function's parameters and return type, including the corresponding specification for a method.
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  liveBookmanning.com
  The Well-Grounded Rubyist, Fourth EditionA method signature specifies the valid calling form of a method, including its parameters.
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  liveBookmanning.com
  Functional Programming in Scala, Second EditionA type signature is a declaration of the types of a function's parameters and result, including any type parameters.
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  liveBookmanning.com
  Python How-ToA function signature is the interface-level description of a function's name and parameters, and in some languages its return information.

Compare how 8 books explain type signature →

Related concepts

• std::packaged_taskconfigures · `std::packaged_task` is a C++ standard library class template that wraps a callable and stores its result in a shared state accessible through a future.
• promptcontrasts with · An input, typically containing instructions or context, supplied to an artificial-intelligence model to guide or elicit its output.
• inputhas part · An input is a value, information, or signal supplied to a system, computation, or interface for processing or to influence its behavior.
• functionpart of · A function is a callable program unit that performs an operation, may accept inputs, and can produce a result or side effect.
• function overloadingused by · Function overloading is defining multiple callable operations with the same name but different parameter signatures, with behavior selected according to the call.

This explainer was generated by Manning's knowledge graph from the text of Refactoring to Rust. The section links point to the parts of the book it draws on.