va_start
Defined in header <cstdarg>
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void va_start( va_list ap, parm_n ); |
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The va_start
macro enables access to the variable arguments following the named argument parm_n
.
va_start
should be invoked with an instance to a valid va_list object ap
before any calls to va_arg.
If parm_n
is declared with reference type or with a type not compatible with the type that results from default argument promotions, the behavior is undefined.
Parameters
ap | - | an instance of the va_list type |
parm_n | - | the named parameter preceding the first variable parameter |
Expanded value
(none)
Notes
va_start
is required to support parm_n
with overloaded operator&
.
Example
Run this code
Output:
150
See also
accesses the next variadic function argument (function macro) | |
ends traversal of the variadic function arguments (function macro) |