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Asked: 2026-06-01T17:03:10+00:00

In this document , the author said Only a POD-type can be an argument

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In this document, the author said

Only a POD-type can be an argument for the ellipsis “…” while std::string is not a POD-type.

I’m understanding this as Passing NON-POD type to Variadic function is undefined behavior. Is it right?
Though, is he saying C/C++ standard? I tried to find it at n3242 C++ spec. But can not find.

I’d like to know I’m understanding rightly and this is a standard.

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1 Answer

  1. Editorial Team

    It’s specified in C++11 5.2.2/7:

    Passing a potentially-evaluated argument of class type having a non-trivial copy constructor, a non-trivial move contructor, or a non-trivial destructor, with no corresponding
    parameter, is conditionally-supported with implementation-defined semantics.

    So it’s up to each compiler whether to support it or not; portable code can’t rely on any implementation defined behaviour. In older standards, it was simply undefined.

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