cNamedArgs

cNamedArgs is a library and design pattern for the C programming language that provides a mechanism for calling functions with named arguments. It aims to improve readability and reduce errors related to parameter order in function calls, without changing the language itself. The approach is typically implemented through preprocessor macros and wrapper code that map named tokens to the corresponding function parameters.

In practice, cNamedArgs relies on a combination of macros, wrapper functions, and carefully designed type definitions to simulate named-argument syntax. A caller provides a set of name=value pairs, and the library establishes the appropriate argument mapping to invoke the target function in its established parameter order. Depending on the implementation, this can involve constructing a small argument descriptor or a temporary structure that holds provided values and defaults for unspecified parameters.

Usage typically resembles a function call with labeled arguments, such as selecting values for width, height, and title in a window-creation function. A user may write calls that provide only the parameters of interest while relying on defaults for others. The underlying implementation translates these named pairs into the positional arguments expected by the actual C function, enabling clearer intent at the call site.

Limitations include reliance on non-standard preprocessing and wrapper code, potential portability and maintainability concerns, and possible compile-time overhead. Type safety and debugging can be more challenging, since named-argument abstractions are not part of the C language standard. Developers should weigh the benefits of readability against complexity and library compatibility when adopting cNamedArgs.

See also: named parameters, C preprocessor macros, designated initializers, wrapper libraries.