Va_arg
va_arg is a C and C++ macro that retrieves the next argument from a variable argument list as a specified type.
Modern C, Third Edition
va_arg is a C library macro that retrieves the next argument from a va_list using a specified type.
- How it is used
- Retrieves successive arguments while implementing a variadic function.
- How deep it goes
- Explains typed retrieval and length management, but does not descend into va_list implementation internals.
- Examples
- Uses a variadic function that sums n double values and retrieves each with an explicit double type.
- What you can do after
- Apply via C library macros to retrieve typed arguments from a variadic function.
Modern C
va_arg is a C standard library macro that retrieves the next argument from a va_list using a specified type.
- How it is used
- Retrieves successive arguments while implementing a C variadic function.
- How deep it goes
- Defines the macro and demonstrates a typed loop, but does not descend into va_list internals.
- Examples
- Uses sumIt to retrieve and sum n double values from a variadic argument list.
- What you can do after
- Build it from scratch by iterating through a va_list with explicit retrieval types and caller-supplied length.
Related concepts
- va_listuses · va_list is a C and C++ type representing the state of traversal through a variable argument list.
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