Va_list
va_list is a C and C++ type representing the state of traversal through a variable argument list.
Modern C, Third Edition
va_list is the C library type used to represent the state of traversal through a variable argument list.
- How it is used
- Supports traversing or forwarding the hidden arguments of C variadic functions.
- How deep it goes
- Defines the lifecycle and four operations but stops short of specifying va_list's representation or ABI details.
- Examples
- Demonstrates forwarding a va_list to vfprintf and summing a sequence of double values.
- What you can do after
- Apply it via <stdarg.h> to traverse variable arguments or forward them to a v-prefixed library function.
Modern C
va_list is the C standard library type used to represent the state of traversal through a variable argument list.
- How it is used
- Supports implementing or forwarding C variadic functions through stdarg.h.
- How deep it goes
- Explains initialization, typed extraction, copying, and cleanup, but defers representation and calling-convention internals.
- Examples
- Uses a printf_debug wrapper and a sumIt function that accumulates n double values.
- What you can do after
- Operate stdarg.h and vfprintf to forward or traverse variable arguments with explicit extraction types.
Related concepts
- va_argused by · va_arg is a C and C++ macro that retrieves the next argument from a variable argument list as a specified type.
- stdarg.hused by · stdarg.h is the C standard header that declares the types and macros for processing variable argument lists.
- variadic argumentsused by · A variadic function or parameter accepts a variable number of arguments, often collecting the supplied values into a sequence of a specified type.
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