funcwithVaList(_:_:)(_args: [CVarArg],_body: (CVaListPointer) ->R) ->R
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func withVaList(_:_:)(_ args: [CVarArg], _ body: (CVaListPointer) -> R) -> R
Invokes the given closure with a C `va_list` argument derived from the given array of arguments.
The pointer passed as an argument to
bodyis valid only during the execution ofwithVaList(_:_:). Do not store or return the pointer for later use.If you need to pass an optional pointer as a
CVarArgargument, use theInt(bitPattern:)initializer to interpret the optional pointer as anIntvalue, which has the same C variadic calling conventions as a pointer on all supported platforms.